diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 2e25b18c..26f579cf 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -59,7 +59,6 @@ jobs:
             plugin-secrets-version: 3.15.0
             plugin-diff-version: 3.8.1
             extra-helmfile-flags: ''
-            v1mode: ''
           - helm-version: v3.16.4
             kustomize-version: v5.4.3
             # We assume that the helm-secrets plugin is supposed to
@@ -70,26 +69,16 @@ jobs:
             plugin-secrets-version: 4.6.0
             plugin-diff-version: 3.9.14
             extra-helmfile-flags: ''
-            v1mode: ''
           - helm-version: v3.17.0
             kustomize-version: v5.2.1
             plugin-secrets-version: 3.15.0
             plugin-diff-version: 3.8.1
             extra-helmfile-flags: ''
-            v1mode: ''
           - helm-version: v3.17.0
             kustomize-version: v5.4.3
             plugin-secrets-version: 4.6.0
             plugin-diff-version: 3.9.14
             extra-helmfile-flags: ''
-            v1mode: ''
-          # Helmfile v1
-          - helm-version: v3.17.0
-            kustomize-version: v5.4.3
-            plugin-secrets-version: 4.6.0
-            plugin-diff-version: 3.9.14
-            extra-helmfile-flags: ''
-            v1mode: 'true'
           # In case you need to test some optional helmfile features,
           # enable it via extra-helmfile-flags below.
           - helm-version: v3.17.0
@@ -97,7 +86,6 @@ jobs:
             plugin-secrets-version: 4.6.0
             plugin-diff-version: 3.9.14
             extra-helmfile-flags: '--enable-live-output'
-            v1mode: ''
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
@@ -127,7 +115,6 @@ jobs:
           HELMFILE_HELM3: 1
           TERM: xterm
           EXTRA_HELMFILE_FLAGS: ${{ matrix.extra-helmfile-flags }}
-          HELMFILE_V1MODE: ${{ matrix.v1mode }}
 
   e2e_tests:
     needs: tests
diff --git a/.github/workflows/releaser.yaml b/.github/workflows/releaser.yaml
index ee2f0dc9..fc98bd7c 100644
--- a/.github/workflows/releaser.yaml
+++ b/.github/workflows/releaser.yaml
@@ -16,7 +16,6 @@ permissions:
 
 env:
   GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-  HELMFILE_V1MODE: ${{ startsWith(github.ref, 'refs/tags/v1') }}
   SNAPSHOT: ${{ !startsWith(github.ref, 'refs/tags/v') && '--snapshot' || '' }}
 
 jobs:
diff --git a/.goreleaser.yml b/.goreleaser.yml
index 6d515513..aba37be9 100644
--- a/.goreleaser.yml
+++ b/.goreleaser.yml
@@ -1,8 +1,5 @@
 version: 2
 project_name: helmfile
-env:
-  # We default to non-v1 mode (=helmfile v0.x behavior) when HELMFILE_V1MODE is not set
-  - HELMFILE_V1MODE={{ if index .Env "HELMFILE_V1MODE"  }}{{ .Env.HELMFILE_V1MODE }}{{ else }}false{{ end }}
 builds:
   - id: helmfile
     main: .
@@ -15,7 +12,6 @@ builds:
       - -X go.szostok.io/version.commit={{.FullCommit}}
       - -X go.szostok.io/version.commitDate={{.CommitDate}}
       - -X go.szostok.io/version.dirtyBuild=false
-      - -X github.com/helmfile/helmfile/pkg/runtime.v1Mode={{.Env.HELMFILE_V1MODE}}
     goos:
       - darwin
       - linux
diff --git a/Makefile b/Makefile
index 0500bd33..5e009ca0 100644
--- a/Makefile
+++ b/Makefile
@@ -25,10 +25,6 @@ build:
 	go build -ldflags="$(GO_BUILD_VERSION_LDFLAGS)" ${TARGETS}
 .PHONY: build
 
-build-v1:
-	go build -ldflags="$(GO_BUILD_VERSION_LDFLAGS) -X github.com/helmfile/helmfile/pkg/runtime.v1Mode=true" ${TARGETS}
-.PHONY: build-v1
-
 generate:
 	go generate ${PKGS}
 .PHONY: generate
diff --git a/cmd/apply.go b/cmd/apply.go
index 9e6cfa47..8cbe4ad9 100644
--- a/cmd/apply.go
+++ b/cmd/apply.go
@@ -5,7 +5,6 @@ import (
 
 	"github.com/helmfile/helmfile/pkg/app"
 	"github.com/helmfile/helmfile/pkg/config"
-	"github.com/helmfile/helmfile/pkg/runtime"
 )
 
 // NewApplyCmd returns apply subcmd
@@ -44,12 +43,6 @@ func NewApplyCmd(globalCfg *config.GlobalImpl) *cobra.Command {
 	f.StringVar(&applyOptions.DiffArgs, "diff-args", "", `pass args to helm helm-diff`)
 	f.StringVar(&applyOptions.SyncArgs, "sync-args", "", `pass args to helm upgrade`)
 	f.StringVar(&globalCfg.GlobalOptions.Args, "args", "", "pass args to helm exec")
-	if !runtime.V1Mode {
-		// TODO: Remove this function once Helmfile v0.x
-		f.BoolVar(&applyOptions.RetainValuesFiles, "retain-values-files", false, "DEPRECATED: Use skip-cleanup instead")
-		_ = f.MarkDeprecated("retain-values-files", "Use skip-cleanup instead")
-	}
-
 	f.BoolVar(&applyOptions.SkipCleanup, "skip-cleanup", false, "Stop cleaning up temporary values generated by helmfile and helm-secrets. Useful for debugging. Don't use in production for security")
 	f.BoolVar(&applyOptions.SkipCRDs, "skip-crds", false, "if set, no CRDs will be installed on sync. By default, CRDs are installed if not already present")
 	f.BoolVar(&applyOptions.SkipNeeds, "skip-needs", true, `do not automatically include releases from the target release's "needs" when --selector/-l flag is provided. Does nothing when --selector/-l flag is not provided. Defaults to true when --include-needs or --include-transitive-needs is not provided`)
diff --git a/cmd/charts.go b/cmd/charts.go
deleted file mode 100644
index cae9d168..00000000
--- a/cmd/charts.go
+++ /dev/null
@@ -1,41 +0,0 @@
-// TODO: Remove this function once Helmfile v0.x
-package cmd
-
-import (
-	"github.com/spf13/cobra"
-
-	"github.com/helmfile/helmfile/pkg/app"
-	"github.com/helmfile/helmfile/pkg/config"
-)
-
-// NewChartsCmd returns charts subcmd
-func NewChartsCmd(globalCfg *config.GlobalImpl) *cobra.Command {
-	chartsOptions := config.NewChartsOptions()
-
-	cmd := &cobra.Command{
-		Use:   "charts",
-		Short: "DEPRECATED: sync releases from state file (helm upgrade --install)",
-		RunE: func(cmd *cobra.Command, args []string) error {
-			chartsImpl := config.NewChartsImpl(globalCfg, chartsOptions)
-			err := config.NewCLIConfigImpl(chartsImpl.GlobalImpl)
-			if err != nil {
-				return err
-			}
-
-			if err := chartsImpl.ValidateConfig(); err != nil {
-				return err
-			}
-
-			a := app.New(chartsImpl)
-			return toCLIError(chartsImpl.GlobalImpl, a.DeprecatedSyncCharts(chartsImpl))
-		},
-	}
-
-	f := cmd.Flags()
-	f.StringVar(&globalCfg.GlobalOptions.Args, "args", "", "pass args to helm exec")
-	f.StringArrayVar(&chartsOptions.Set, "set", nil, "additional values to be merged into the helm command --set flag")
-	f.StringArrayVar(&chartsOptions.Values, "values", nil, "additional value files to be merged into the helm command --values flag")
-	f.IntVar(&chartsOptions.Concurrency, "concurrency", 0, "maximum number of concurrent helm processes to run, 0 is unlimited")
-
-	return cmd
-}
diff --git a/cmd/delete.go b/cmd/delete.go
deleted file mode 100644
index 1c89c147..00000000
--- a/cmd/delete.go
+++ /dev/null
@@ -1,44 +0,0 @@
-// TODO: Remove this function once Helmfile v0.x
-package cmd
-
-import (
-	"github.com/spf13/cobra"
-
-	"github.com/helmfile/helmfile/pkg/app"
-	"github.com/helmfile/helmfile/pkg/config"
-)
-
-// NewDeleteCmd returns delete subcmd
-func NewDeleteCmd(globalCfg *config.GlobalImpl) *cobra.Command {
-	deleteOptions := config.NewDeleteOptions()
-
-	cmd := &cobra.Command{
-		Use:   "delete",
-		Short: "DEPRECATED: delete releases from state file (helm delete)",
-		RunE: func(cmd *cobra.Command, args []string) error {
-			deleteImpl := config.NewDeleteImpl(globalCfg, deleteOptions)
-			err := config.NewCLIConfigImpl(deleteImpl.GlobalImpl)
-			if err != nil {
-				return err
-			}
-
-			if err := deleteImpl.ValidateConfig(); err != nil {
-				return err
-			}
-
-			a := app.New(deleteImpl)
-			return toCLIError(deleteImpl.GlobalImpl, a.Delete(deleteImpl))
-		},
-	}
-
-	f := cmd.Flags()
-	f.StringVar(&globalCfg.GlobalOptions.Args, "args", "", "pass args to helm exec")
-	f.StringVar(&deleteOptions.Cascade, "cascade", "", "pass cascade to helm exec, default: background")
-	f.IntVar(&deleteOptions.Concurrency, "concurrency", 0, "maximum number of concurrent helm processes to run, 0 is unlimited")
-	f.BoolVar(&deleteOptions.Purge, "purge", false, "purge releases i.e. free release names and histories")
-	f.BoolVar(&deleteOptions.SkipCharts, "skip-charts", false, "don't prepare charts when deleting releases")
-	f.BoolVar(&deleteOptions.DeleteWait, "deleteWait", false, `override helmDefaults.wait setting "helm uninstall --wait"`)
-	f.IntVar(&deleteOptions.DeleteTimeout, "deleteTimeout", 300, `time in seconds to wait for helm uninstall, default: 300`)
-
-	return cmd
-}
diff --git a/cmd/root.go b/cmd/root.go
index f94cd9be..ed629d12 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -109,14 +109,6 @@ func NewRootCmd(globalConfig *config.GlobalOptions) (*cobra.Command, error) {
 		),
 	)
 
-	// TODO: Remove this function once Helmfile v0.x
-	if !runtime.V1Mode {
-		cmd.AddCommand(
-			NewChartsCmd(globalImpl),
-			NewDeleteCmd(globalImpl),
-		)
-	}
-
 	return cmd, nil
 }
 
diff --git a/docs/index.md b/docs/index.md
index 88c819b7..db460ca9 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -557,7 +557,6 @@ Helmfile uses some OS environment variables to override default behaviour:
 * `HELMFILE_ENVIRONMENT` - specify [Helmfile environment](https://helmfile.readthedocs.io/en/latest/#environment), it has lower priority than CLI argument `--environment`
 * `HELMFILE_TEMPDIR` - specify directory to store temporary files
 * `HELMFILE_UPGRADE_NOTICE_DISABLED` - expecting any non-empty value to skip the check for the latest version of Helmfile in [helmfile version](https://helmfile.readthedocs.io/en/latest/#version)
-* `HELMFILE_V1MODE` - Helmfile v0.x behaves like v1.x with `true`, Helmfile v1.x behaves like v0.x with `false` as value
 * `HELMFILE_GOCCY_GOYAML` - use *goccy/go-yaml* instead of *gopkg.in/yaml.v2*.  It's `false` by default in Helmfile v0.x and `true` by default for Helmfile v1.x.
 * `HELMFILE_CACHE_HOME` - specify directory to store cached files for remote operations
 * `HELMFILE_FILE_PATH` - specify the path to the helmfile.yaml file
diff --git a/pkg/app/app.go b/pkg/app/app.go
index 91beba57..3a44b252 100644
--- a/pkg/app/app.go
+++ b/pkg/app/app.go
@@ -20,7 +20,6 @@ import (
 	"github.com/helmfile/helmfile/pkg/helmexec"
 	"github.com/helmfile/helmfile/pkg/plugins"
 	"github.com/helmfile/helmfile/pkg/remote"
-	"github.com/helmfile/helmfile/pkg/runtime"
 	"github.com/helmfile/helmfile/pkg/state"
 )
 
@@ -139,25 +138,6 @@ func (a *App) Repos(c ReposConfigProvider) error {
 	}, c.IncludeTransitiveNeeds(), SetFilter(true))
 }
 
-// TODO: Remove this function once Helmfile v0.x
-func (a *App) DeprecatedSyncCharts(c DeprecatedChartsConfigProvider) error {
-	return a.ForEachState(func(run *Run) (_ bool, errs []error) {
-		err := run.withPreparedCharts("charts", state.ChartPrepareOptions{
-			SkipRepos:   true,
-			SkipDeps:    true,
-			Concurrency: 2,
-		}, func() {
-			errs = run.DeprecatedSyncCharts(c)
-		})
-
-		if err != nil {
-			errs = append(errs, err)
-		}
-
-		return
-	}, c.IncludeTransitiveNeeds(), SetFilter(true))
-}
-
 func (a *App) Diff(c DiffConfigProvider) error {
 	var allDiffDetectedErrs []error
 
@@ -409,7 +389,7 @@ func (a *App) Apply(c ApplyConfigProvider) error {
 
 	var opts []LoadOption
 
-	opts = append(opts, SetRetainValuesFiles(c.RetainValuesFiles() || c.SkipCleanup()))
+	opts = append(opts, SetRetainValuesFiles(c.SkipCleanup()))
 
 	err := a.ForEachState(func(run *Run) (ok bool, errs []error) {
 		includeCRDs := !c.SkipCRDs()
@@ -421,7 +401,7 @@ func (a *App) Apply(c ApplyConfigProvider) error {
 			Wait:                   c.Wait(),
 			WaitForJobs:            c.WaitForJobs(),
 			IncludeCRDs:            &includeCRDs,
-			SkipCleanup:            c.RetainValuesFiles() || c.SkipCleanup(),
+			SkipCleanup:            c.SkipCleanup(),
 			Validate:               c.Validate(),
 			Concurrency:            c.Concurrency(),
 			IncludeTransitiveNeeds: c.IncludeNeeds(),
@@ -473,31 +453,6 @@ func (a *App) Status(c StatusesConfigProvider) error {
 	}, false, SetFilter(true))
 }
 
-// TODO: Remove this function once Helmfile v0.x
-func (a *App) Delete(c DeleteConfigProvider) error {
-	return a.ForEachState(func(run *Run) (ok bool, errs []error) {
-		if !c.SkipCharts() {
-			err := run.withPreparedCharts("delete", state.ChartPrepareOptions{
-				SkipRepos:     c.SkipRefresh() || c.SkipDeps(),
-				SkipRefresh:   c.SkipRefresh(),
-				SkipDeps:      c.SkipDeps(),
-				Concurrency:   c.Concurrency(),
-				DeleteWait:    c.DeleteWait(),
-				DeleteTimeout: c.DeleteTimeout(),
-			}, func() {
-				ok, errs = a.delete(run, c.Purge(), c)
-			})
-
-			if err != nil {
-				errs = append(errs, err)
-			}
-		} else {
-			ok, errs = a.delete(run, c.Purge(), c)
-		}
-		return
-	}, false, SetReverse(true))
-}
-
 func (a *App) Destroy(c DestroyConfigProvider) error {
 	return a.ForEachState(func(run *Run) (ok bool, errs []error) {
 		if !c.SkipCharts() {
@@ -1258,16 +1213,6 @@ func (a *App) findDesiredStateFiles(specifiedPath string, opts LoadOpts) ([]stri
 
 		case a.fs.FileExistsAt(DefaultGotmplHelmfile):
 			defaultFile = DefaultGotmplHelmfile
-
-		// TODO: Remove this block when we remove v0 code
-		case !runtime.V1Mode && a.fs.FileExistsAt(DeprecatedHelmfile):
-			a.Logger.Warnf(
-				"warn: %s is being loaded: %s is deprecated in favor of %s. See https://github.com/roboll/helmfile/issues/25 for more information",
-				DeprecatedHelmfile,
-				DeprecatedHelmfile,
-				DefaultHelmfile,
-			)
-			defaultFile = DeprecatedHelmfile
 		}
 
 		switch {
@@ -1432,7 +1377,7 @@ func (a *App) apply(r *Run, c ApplyConfigProvider) (bool, bool, []error) {
 		Context:                 c.Context(),
 		Output:                  c.DiffOutput(),
 		Set:                     c.Set(),
-		SkipCleanup:             c.RetainValuesFiles() || c.SkipCleanup(),
+		SkipCleanup:             c.SkipCleanup(),
 		SkipDiffOnInstall:       c.SkipDiffOnInstall(),
 		ReuseValues:             c.ReuseValues(),
 		ResetValues:             c.ResetValues(),
@@ -1543,7 +1488,7 @@ Do you really want to apply?
 
 				syncOpts := &state.SyncOpts{
 					Set:                  c.Set(),
-					SkipCleanup:          c.RetainValuesFiles() || c.SkipCleanup(),
+					SkipCleanup:          c.SkipCleanup(),
 					SkipCRDs:             c.SkipCRDs(),
 					Wait:                 c.Wait(),
 					WaitForJobs:          c.WaitForJobs(),
diff --git a/pkg/app/app_test.go b/pkg/app/app_test.go
index df79ee51..d3dc6cf9 100644
--- a/pkg/app/app_test.go
+++ b/pkg/app/app_test.go
@@ -2213,9 +2213,6 @@ type applyConfig struct {
 	cascade string
 	values  []string
 
-	// TODO: Remove this function once Helmfile v0.x
-	retainValuesFiles bool
-
 	set                     []string
 	validate                bool
 	skipCleanup             bool
@@ -2376,11 +2373,6 @@ func (a applyConfig) Logger() *zap.SugaredLogger {
 	return a.logger
 }
 
-// TODO: Remove this function once Helmfile v0.x
-func (a applyConfig) RetainValuesFiles() bool {
-	return a.retainValuesFiles
-}
-
 func (a applyConfig) SkipDiffOnInstall() bool {
 	return a.skipDiffOnInstall
 }
diff --git a/pkg/app/config.go b/pkg/app/config.go
index b6e3a064..1a46c4cc 100644
--- a/pkg/app/config.go
+++ b/pkg/app/config.go
@@ -25,15 +25,6 @@ type ConfigProvider interface {
 	loggingConfig
 }
 
-// TODO: Remove this function once Helmfile v0.x
-type DeprecatedChartsConfigProvider interface {
-	Values() []string
-
-	concurrencyConfig
-	loggingConfig
-	IncludeTransitiveNeeds() bool
-}
-
 type DepsConfigProvider interface {
 	Args() string
 	SkipRepos() bool
@@ -81,9 +72,6 @@ type ApplyConfigProvider interface {
 	Context() int
 	DiffOutput() string
 
-	// TODO: Remove this function once Helmfile v0.x
-	RetainValuesFiles() bool
-
 	Validate() bool
 	SkipCleanup() bool
 	SkipDiffOnInstall() bool
@@ -166,23 +154,6 @@ type DiffConfigProvider interface {
 	valuesControlMode
 }
 
-// TODO: Remove this function once Helmfile v0.x
-type DeleteConfigProvider interface {
-	Args() string
-	Cascade() string
-
-	Purge() bool
-	SkipDeps() bool
-	SkipRefresh() bool
-	SkipCharts() bool
-	DeleteWait() bool
-	DeleteTimeout() int
-
-	interactive
-	loggingConfig
-	concurrencyConfig
-}
-
 type DestroyConfigProvider interface {
 	Args() string
 	Cascade() string
diff --git a/pkg/app/constants.go b/pkg/app/constants.go
index 63fd3af7..38d06ce0 100644
--- a/pkg/app/constants.go
+++ b/pkg/app/constants.go
@@ -8,10 +8,7 @@ import (
 )
 
 const (
-	DefaultHelmfile = "helmfile.yaml"
-	// TODO: Remove this function once Helmfile v0.x
-	DeprecatedHelmfile = "charts.yaml"
-
+	DefaultHelmfile              = "helmfile.yaml"
 	DefaultHelmfileDirectory     = "helmfile.d"
 	ExperimentalSelectorExplicit = "explicit-selector-inheritance" // value to remove default selector inheritance to sub-helmfiles and use the explicit one
 )
diff --git a/pkg/app/desired_state_file_loader.go b/pkg/app/desired_state_file_loader.go
index 76fa81f5..90986023 100644
--- a/pkg/app/desired_state_file_loader.go
+++ b/pkg/app/desired_state_file_loader.go
@@ -15,7 +15,6 @@ import (
 	"github.com/helmfile/helmfile/pkg/helmexec"
 	"github.com/helmfile/helmfile/pkg/policy"
 	"github.com/helmfile/helmfile/pkg/remote"
-	"github.com/helmfile/helmfile/pkg/runtime"
 	"github.com/helmfile/helmfile/pkg/state"
 )
 
@@ -162,21 +161,14 @@ func (a *desiredStateLoader) underlying() *state.StateCreator {
 func (a *desiredStateLoader) rawLoad(yaml []byte, baseDir, file string, evaluateBases bool, env, overrodeEnv *environment.Environment) (*state.HelmState, error) {
 	var st *state.HelmState
 	var err error
-	if runtime.V1Mode {
-		st, err = a.underlying().ParseAndLoad(yaml, baseDir, file, a.env, false, evaluateBases, env, overrodeEnv)
-		if err != nil {
-			return nil, err
-		}
-	} else {
-		merged, err := env.Merge(overrodeEnv)
-		if err != nil {
-			return nil, err
-		}
+	merged, err := env.Merge(overrodeEnv)
+	if err != nil {
+		return nil, err
+	}
 
-		st, err = a.underlying().ParseAndLoad(yaml, baseDir, file, a.env, false, evaluateBases, merged, nil)
-		if err != nil {
-			return nil, err
-		}
+	st, err = a.underlying().ParseAndLoad(yaml, baseDir, file, a.env, false, evaluateBases, merged, nil)
+	if err != nil {
+		return nil, err
 	}
 	helmfiles, err := st.ExpandedHelmfiles()
 	if err != nil {
@@ -207,7 +199,7 @@ func (ld *desiredStateLoader) load(env, overrodeEnv *environment.Environment, ba
 
 		var rawContent []byte
 
-		if filepath.Ext(filename) == ".gotmpl" || !runtime.V1Mode {
+		if filepath.Ext(filename) == ".gotmpl" {
 			var yamlBuf *bytes.Buffer
 			var err error
 
diff --git a/pkg/app/run.go b/pkg/app/run.go
index e29fce2a..f01c2d4d 100644
--- a/pkg/app/run.go
+++ b/pkg/app/run.go
@@ -135,17 +135,6 @@ func (r *Run) Repos(c ReposConfigProvider) error {
 	return r.ctx.SyncReposOnce(r.state, r.helm)
 }
 
-// TODO: Remove this function once Helmfile v0.x
-func (r *Run) DeprecatedSyncCharts(c DeprecatedChartsConfigProvider) []error {
-	st := r.state
-	helm := r.helm
-
-	affectedReleases := state.AffectedReleases{}
-	errs := st.SyncReleases(&affectedReleases, helm, c.Values(), c.Concurrency())
-	affectedReleases.DisplayAffectedReleases(c.Logger())
-	return errs
-}
-
 func (r *Run) diff(triggerCleanupEvent bool, detailedExitCode bool, c DiffConfigProvider, diffOpts *state.DiffOpts) (*string, map[string]state.ReleaseSpec, map[string]state.ReleaseSpec, []error) {
 	st := r.state
 	helm := r.helm
diff --git a/pkg/app/two_pass_renderer.go b/pkg/app/two_pass_renderer.go
index 221af0c2..e950a7cb 100644
--- a/pkg/app/two_pass_renderer.go
+++ b/pkg/app/two_pass_renderer.go
@@ -8,7 +8,6 @@ import (
 	"github.com/google/go-cmp/cmp"
 
 	"github.com/helmfile/helmfile/pkg/environment"
-	"github.com/helmfile/helmfile/pkg/runtime"
 	"github.com/helmfile/helmfile/pkg/state"
 	"github.com/helmfile/helmfile/pkg/tmpl"
 )
@@ -84,9 +83,6 @@ func (r *desiredStateLoader) renderTemplatesToYamlWithEnv(baseDir, filename stri
 func (r *desiredStateLoader) twoPassRenderTemplateToYaml(inherited, overrode *environment.Environment, baseDir, filename string, content []byte) (*bytes.Buffer, error) {
 	// try a first pass render. This will always succeed, but can produce a limited env
 	var phase string
-	if !runtime.V1Mode {
-		phase = "first-pass "
-	}
 	r.logger.Debugf("%srendering starting for \"%s\": inherited=%v, overrode=%v", phase, filename, inherited, overrode)
 
 	initEnv, err := inherited.Merge(nil)
@@ -100,53 +96,14 @@ func (r *desiredStateLoader) twoPassRenderTemplateToYaml(inherited, overrode *en
 		vals           map[string]any
 	)
 
-	if runtime.V1Mode {
-		var err error
+	finalEnv, err = initEnv.Merge(overrode)
+	if err != nil {
+		return nil, err
+	}
 
-		finalEnv, err = initEnv.Merge(overrode)
-		if err != nil {
-			return nil, err
-		}
-
-		vals, err = finalEnv.GetMergedValues()
-		if err != nil {
-			return nil, err
-		}
-	} else {
-		r.logger.Debugf("first-pass uses: %v", initEnv)
-		firstPassEnv, err := initEnv.Merge(nil)
-		if err != nil {
-			return nil, err
-		}
-		renderedEnv, prestate := r.renderPrestate(firstPassEnv, overrode, baseDir, filename, content)
-
-		r.logger.Debugf("first-pass produced: %v", renderedEnv)
-
-		mergedEnv, err := inherited.Merge(renderedEnv)
-		if err != nil {
-			return nil, err
-		}
-
-		mergedEnv, err = mergedEnv.Merge(overrode)
-		if err != nil {
-			return nil, err
-		}
-
-		r.logger.Debugf("first-pass rendering result of \"%s\": %v", filename, *mergedEnv)
-
-		renderingPhase = "second-pass "
-
-		finalEnv = mergedEnv
-
-		vals, err = finalEnv.GetMergedValues()
-		if err != nil {
-			return nil, err
-		}
-
-		if prestate != nil {
-			prestate.Env = *mergedEnv
-			r.logger.Debugf("vals:\n%v\ndefaultVals:%v", vals, prestate.DefaultValues)
-		}
+	vals, err = finalEnv.GetMergedValues()
+	if err != nil {
+		return nil, err
 	}
 
 	tmplData := state.NewEnvironmentTemplateData(*finalEnv, r.namespace, vals)
diff --git a/pkg/app/two_pass_renderer_test.go b/pkg/app/two_pass_renderer_test.go
index fde1630f..c209c78a 100644
--- a/pkg/app/two_pass_renderer_test.go
+++ b/pkg/app/two_pass_renderer_test.go
@@ -7,7 +7,6 @@ import (
 
 	"github.com/helmfile/helmfile/pkg/helmexec"
 	"github.com/helmfile/helmfile/pkg/remote"
-	"github.com/helmfile/helmfile/pkg/runtime"
 	"github.com/helmfile/helmfile/pkg/state"
 	"github.com/helmfile/helmfile/pkg/testhelper"
 	"github.com/helmfile/helmfile/pkg/yaml"
@@ -165,20 +164,7 @@ releases:
 }
 
 func TestReadFromYaml_RenderTemplateLog(t *testing.T) {
-	v := runtime.V1Mode
-	t.Cleanup(func() {
-		runtime.V1Mode = v
-	})
-
-	t.Run("v0mode", func(t *testing.T) {
-		runtime.V1Mode = false
-		testReadFromYaml_RenderTemplateLog(t)
-	})
-
-	t.Run("v1mode", func(t *testing.T) {
-		runtime.V1Mode = true
-		testReadFromYaml_RenderTemplateLog(t)
-	})
+	testReadFromYaml_RenderTemplateLog(t)
 }
 
 func TestReadFromYaml_RenderTemplateWithValuesReferenceError(t *testing.T) {
diff --git a/pkg/config/apply.go b/pkg/config/apply.go
index 4d67aa61..f3f0946f 100644
--- a/pkg/config/apply.go
+++ b/pkg/config/apply.go
@@ -18,10 +18,6 @@ type ApplyOptions struct {
 	DetailedExitcode bool
 	// StripTrailingCR is true if trailing carriage returns should be stripped during diffing
 	StripTrailingCR bool
-	// TODO: Remove this function once Helmfile v0.x
-	// DEPRECATED: Use skip-cleanup instead
-	RetainValuesFiles bool
-
 	// SkipCleanup is true if the cleanup of temporary values files should be skipped
 	SkipCleanup bool
 	// SkipCRDs is true if the CRDs should be skipped
@@ -139,12 +135,6 @@ func (a *ApplyImpl) IncludeTransitiveNeeds() bool {
 	return a.ApplyOptions.IncludeTransitiveNeeds
 }
 
-// TODO: Remove this function once Helmfile v0.x
-// RetainValuesFiles returns the retain values files.
-func (a *ApplyImpl) RetainValuesFiles() bool {
-	return a.ApplyOptions.RetainValuesFiles
-}
-
 // ShowSecrets returns the show secrets.
 func (a *ApplyImpl) ShowSecrets() bool {
 	return a.ApplyOptions.ShowSecrets
diff --git a/pkg/config/charts.go b/pkg/config/charts.go
deleted file mode 100644
index 859894bc..00000000
--- a/pkg/config/charts.go
+++ /dev/null
@@ -1,46 +0,0 @@
-// TODO: Remove this function once Helmfile v0.x
-package config
-
-// ChartsOptions is the options for the build command
-type ChartsOptions struct {
-	// Set is the additional values to be merged into the helm command --set flag
-	Set []string
-	// Values is the additional value files to be merged into the helm command --values flag
-	Values []string
-	// Concurrency is the maximum number of concurrent helm processes to run, 0 is unlimited
-	Concurrency int
-}
-
-// NewChartsOptions creates a new Apply
-func NewChartsOptions() *ChartsOptions {
-	return &ChartsOptions{}
-}
-
-// ChartsImpl is impl for applyOptions
-type ChartsImpl struct {
-	*GlobalImpl
-	*ChartsOptions
-}
-
-// NewChartsImpl creates a new ChartsImpl
-func NewChartsImpl(g *GlobalImpl, b *ChartsOptions) *ChartsImpl {
-	return &ChartsImpl{
-		GlobalImpl:    g,
-		ChartsOptions: b,
-	}
-}
-
-// Concurrency returns the concurrency
-func (c *ChartsImpl) Concurrency() int {
-	return c.ChartsOptions.Concurrency
-}
-
-// IncludeTransitiveNeeds returns the includeTransitiveNeeds
-func (c *ChartsImpl) IncludeTransitiveNeeds() bool {
-	return false
-}
-
-// Values returns the values
-func (c *ChartsImpl) Values() []string {
-	return c.ChartsOptions.Values
-}
diff --git a/pkg/config/delete.go b/pkg/config/delete.go
deleted file mode 100644
index f688e94f..00000000
--- a/pkg/config/delete.go
+++ /dev/null
@@ -1,67 +0,0 @@
-// TODO: Remove this function once Helmfile v0.x
-package config
-
-// DeleteOptions is the options for the build command
-type DeleteOptions struct {
-	// Concurrency is the maximum number of concurrent helm processes to run, 0 is unlimited
-	Concurrency int
-	// Purge is the purge flag
-	Purge bool
-	// SkipCharts makes Delete skip `withPreparedCharts`
-	SkipCharts bool
-	// Cascade '--cascade' to helmv3 delete, available values: background, foreground, or orphan, default: background
-	Cascade string
-	// Wait '--wait' if set, will wait until all the resources are deleted before returning. It will wait for as long as --timeout
-	DeleteWait bool
-	// Timeout '--timeout', to wait for helm delete operation (default 5m0s)
-	DeleteTimeout int
-}
-
-// NewDeleteOptions creates a new Apply
-func NewDeleteOptions() *DeleteOptions {
-	return &DeleteOptions{}
-}
-
-// DeleteImpl is impl for applyOptions
-type DeleteImpl struct {
-	*GlobalImpl
-	*DeleteOptions
-}
-
-// NewDeleteImpl creates a new DeleteImpl
-func NewDeleteImpl(g *GlobalImpl, b *DeleteOptions) *DeleteImpl {
-	return &DeleteImpl{
-		GlobalImpl:    g,
-		DeleteOptions: b,
-	}
-}
-
-// Concurrency returns the concurrency
-func (c *DeleteImpl) Concurrency() int {
-	return c.DeleteOptions.Concurrency
-}
-
-// Purge returns the purge
-func (c *DeleteImpl) Purge() bool {
-	return c.DeleteOptions.Purge
-}
-
-// SkipCharts returns skipCharts flag
-func (c *DeleteImpl) SkipCharts() bool {
-	return c.DeleteOptions.SkipCharts
-}
-
-// Cascade returns cascade flag
-func (c *DeleteImpl) Cascade() string {
-	return c.DeleteOptions.Cascade
-}
-
-// DeleteWait returns the wait flag
-func (c *DeleteImpl) DeleteWait() bool {
-	return c.DeleteOptions.DeleteWait
-}
-
-// DeleteTimeout returns the timeout flag
-func (c *DeleteImpl) DeleteTimeout() int {
-	return c.DeleteOptions.DeleteTimeout
-}
diff --git a/pkg/envvar/const.go b/pkg/envvar/const.go
index 94df7381..0235af17 100644
--- a/pkg/envvar/const.go
+++ b/pkg/envvar/const.go
@@ -6,16 +6,12 @@ const (
 	// use helm status to check if a release exists before installing it
 	UseHelmStatusToCheckReleaseExistence = "HELMFILE_USE_HELM_STATUS_TO_CHECK_RELEASE_EXISTENCE"
 
-	// TODO: Remove this function once Helmfile v0.x
-	SkipInsecureTemplateFunctions = "HELMFILE_SKIP_INSECURE_TEMPLATE_FUNCTIONS"
-
 	DisableRunnerUniqueID = "HELMFILE_DISABLE_RUNNER_UNIQUE_ID"
 	Experimental          = "HELMFILE_EXPERIMENTAL" // environment variable for experimental features, expecting "true" lower case
 	Environment           = "HELMFILE_ENVIRONMENT"
 	FilePath              = "HELMFILE_FILE_PATH"
 	TempDir               = "HELMFILE_TEMPDIR"
 	UpgradeNoticeDisabled = "HELMFILE_UPGRADE_NOTICE_DISABLED"
-	V1Mode                = "HELMFILE_V1MODE"
 	GoccyGoYaml           = "HELMFILE_GOCCY_GOYAML"
 	CacheHome             = "HELMFILE_CACHE_HOME"
 	Interactive           = "HELMFILE_INTERACTIVE"
diff --git a/pkg/policy/checker.go b/pkg/policy/checker.go
index b493d513..28db5d70 100644
--- a/pkg/policy/checker.go
+++ b/pkg/policy/checker.go
@@ -9,8 +9,6 @@ import (
 	"slices"
 	"strings"
 	"unicode"
-
-	"github.com/helmfile/helmfile/pkg/runtime"
 )
 
 var (
@@ -51,7 +49,7 @@ func forbidEnvironmentsWithReleases(filePath string, content []byte) (bool, erro
 	}
 	for i := 0; i < len(result)-1; i++ {
 		if result[i] != "---" && result[i+1] != "---" {
-			return runtime.V1Mode, EnvironmentsAndReleasesWithinSameYamlPartErr
+			return true, EnvironmentsAndReleasesWithinSameYamlPartErr
 		}
 	}
 	return false, nil
@@ -123,7 +121,7 @@ func TopConfigKeysVerifier(filePath string, helmfileContent []byte) (bool, error
 		preKey := orderKeys[i-1]
 		currentKey := orderKeys[i]
 		if topkeysPriority[preKey] > topkeysPriority[currentKey] {
-			return runtime.V1Mode, fmt.Errorf("top-level config key %s must be defined before %s in %s", currentKey, preKey, filePath)
+			return true, fmt.Errorf("top-level config key %s must be defined before %s in %s", currentKey, preKey, filePath)
 		}
 	}
 	return false, nil
diff --git a/pkg/policy/checker_test.go b/pkg/policy/checker_test.go
index 7c28555c..e7e41811 100644
--- a/pkg/policy/checker_test.go
+++ b/pkg/policy/checker_test.go
@@ -4,15 +4,12 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/require"
-
-	"github.com/helmfile/helmfile/pkg/runtime"
 )
 
 func TestForbidEnvironmentsWithReleases(t *testing.T) {
 	testCases := []struct {
 		name        string
 		filePath    string
-		v1mode      bool
 		content     []byte
 		expectedErr bool
 		isStrict    bool
@@ -21,7 +18,6 @@ func TestForbidEnvironmentsWithReleases(t *testing.T) {
 			name:        "no error when only releases",
 			filePath:    "helmfile.yaml",
 			content:     []byte("releases:\n"),
-			v1mode:      false,
 			expectedErr: false,
 			isStrict:    false,
 		},
@@ -29,7 +25,6 @@ func TestForbidEnvironmentsWithReleases(t *testing.T) {
 			name:        "no error when only environments",
 			filePath:    "helmfile.yaml",
 			content:     []byte("environments:\n"),
-			v1mode:      false,
 			expectedErr: false,
 			isStrict:    false,
 		},
@@ -37,7 +32,6 @@ func TestForbidEnvironmentsWithReleases(t *testing.T) {
 			name:        "no error when has --- between releases and environments",
 			filePath:    "helmfile.yaml",
 			content:     []byte("environments:\n---\nreleases:\n"),
-			v1mode:      false,
 			expectedErr: false,
 			isStrict:    false,
 		},
@@ -45,7 +39,6 @@ func TestForbidEnvironmentsWithReleases(t *testing.T) {
 			name:        "no error when has --- between releases and environments, and --- on top of helmfile.yaml.gotmpl",
 			filePath:    "helmfile.yaml",
 			content:     []byte("---\nenvironments:\n---\nreleases:\n"),
-			v1mode:      false,
 			expectedErr: false,
 			isStrict:    false,
 		},
@@ -53,7 +46,6 @@ func TestForbidEnvironmentsWithReleases(t *testing.T) {
 			name:        "error when both releases and environments",
 			filePath:    "helmfile.yaml",
 			content:     []byte("environments:\nreleases:\n"),
-			v1mode:      false,
 			expectedErr: true,
 			isStrict:    false,
 		},
@@ -61,20 +53,13 @@ func TestForbidEnvironmentsWithReleases(t *testing.T) {
 			name:        "error when both releases and environments for plain yaml on v1",
 			filePath:    "helmfile.yaml",
 			content:     []byte("environments:\nreleases:\n"),
-			v1mode:      true,
 			expectedErr: true,
 			isStrict:    true,
 		},
 	}
 
-	v1mode := runtime.V1Mode
-	t.Cleanup(func() {
-		runtime.V1Mode = v1mode
-	})
-
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
-			runtime.V1Mode = tc.v1mode
 			isStrict, err := forbidEnvironmentsWithReleases(tc.filePath, tc.content)
 			require.Equal(t, tc.isStrict, isStrict, "expected isStrict=%v, got=%v", tc.isStrict, isStrict)
 			if tc.expectedErr {
diff --git a/pkg/runtime/runtime.go b/pkg/runtime/runtime.go
index e2e407b5..7c1e1d14 100644
--- a/pkg/runtime/runtime.go
+++ b/pkg/runtime/runtime.go
@@ -3,24 +3,15 @@ package runtime
 import (
 	"fmt"
 	"os"
-	"strconv"
 
 	"github.com/helmfile/helmfile/pkg/envvar"
 )
 
-// V1Mode is false by default for Helmfile v0.x and
-// true by default for Helmfile v1.x
 var (
-	V1Mode bool
-
 	// GoccyGoYaml is set to true in order to let Helmfile use
 	// goccy/go-yaml instead of gopkg.in/yaml.v2.
 	// It's false by default in Helmfile v0.x and true by default for Helmfile v1.x.
 	GoccyGoYaml bool
-
-	// We set this via ldflags at build-time so that we can use the
-	// value specified at the build time as the runtime default.
-	v1Mode string
 )
 
 func Info() string {
@@ -29,22 +20,10 @@ func Info() string {
 		yamlLib = "goccy/go-yaml"
 	}
 
-	return fmt.Sprintf("V1 mode = %v\nYAML library = %v", V1Mode, yamlLib)
+	return fmt.Sprintf("YAML library = %v", yamlLib)
 }
 
 func init() {
-	// You can toggle the V1 mode at runtime via an envvar:
-	// - Helmfile v1.x behaves like v0.x by running it with HELMFILE_V1MODE=false
-	// - Helmfile v0.x behaves like v1.x by with HELMFILE_V1MODE=true
-	switch os.Getenv(envvar.V1Mode) {
-	case "true":
-		V1Mode = true
-	case "false":
-		V1Mode = false
-	default:
-		V1Mode, _ = strconv.ParseBool(v1Mode)
-	}
-
 	// You can switch the YAML library at runtime via an envvar:
 	switch os.Getenv(envvar.GoccyGoYaml) {
 	case "true":
@@ -52,6 +31,6 @@ func init() {
 	case "false":
 		GoccyGoYaml = false
 	default:
-		GoccyGoYaml = V1Mode
+		GoccyGoYaml = true
 	}
 }
diff --git a/pkg/state/create.go b/pkg/state/create.go
index c08086d4..248a3c85 100644
--- a/pkg/state/create.go
+++ b/pkg/state/create.go
@@ -117,20 +117,6 @@ func (c *StateCreator) Parse(content []byte, baseDir, file string) (*HelmState,
 		}
 	}
 
-	// TODO: Remove this function once Helmfile v0.x
-	if len(state.DeprecatedReleases) > 0 {
-		if len(state.Releases) > 0 {
-			return nil, fmt.Errorf("failed to parse %s: you can't specify both `charts` and `releases` sections", file)
-		}
-		state.Releases = state.DeprecatedReleases
-		state.DeprecatedReleases = []ReleaseSpec{}
-	}
-
-	// TODO: Remove this function once Helmfile v0.x
-	if state.DeprecatedContext != "" && state.HelmDefaults.KubeContext == "" {
-		state.HelmDefaults.KubeContext = state.DeprecatedContext
-	}
-
 	if c.overrideHelmBinary != "" && c.overrideHelmBinary != DefaultHelmBinary {
 		state.DefaultHelmBinary = c.overrideHelmBinary
 	} else if state.DefaultHelmBinary == "" {
diff --git a/pkg/state/create_test.go b/pkg/state/create_test.go
index 46b1e072..4cc282be 100644
--- a/pkg/state/create_test.go
+++ b/pkg/state/create_test.go
@@ -280,26 +280,6 @@ func TestReadFromYaml_StrictUnmarshalling(t *testing.T) {
 	}
 }
 
-// TODO: Remove this function once Helmfile v0.x
-func TestReadFromYaml_DeprecatedReleaseReferences(t *testing.T) {
-	yamlFile := "example/path/to/yaml/file"
-	yamlContent := []byte(`charts:
-- name: myrelease
-  chart: mychart
-`)
-	state, err := createFromYaml(yamlContent, yamlFile, DefaultEnv, logger)
-	if err != nil {
-		t.Errorf("unxpected error: %v", err)
-	}
-
-	if state.Releases[0].Name != "myrelease" {
-		t.Errorf("unexpected release name: expected=myrelease actual=%s", state.Releases[0].Name)
-	}
-	if state.Releases[0].Chart != "mychart" {
-		t.Errorf("unexpected chart name: expected=mychart actual=%s", state.Releases[0].Chart)
-	}
-}
-
 func TestReadFromYaml_ConflictingReleasesConfig(t *testing.T) {
 	yamlFile := "example/path/to/yaml/file"
 	yamlContent := []byte(`charts:
diff --git a/pkg/state/state.go b/pkg/state/state.go
index a28c05d9..4d9e43e1 100644
--- a/pkg/state/state.go
+++ b/pkg/state/state.go
@@ -60,10 +60,6 @@ type ReleaseSetSpec struct {
 	HelmDefaults HelmSpec          `yaml:"helmDefaults,omitempty"`
 	Helmfiles    []SubHelmfileSpec `yaml:"helmfiles,omitempty"`
 
-	// TODO: Remove this function once Helmfile v0.x
-	DeprecatedContext  string        `yaml:"context,omitempty"`
-	DeprecatedReleases []ReleaseSpec `yaml:"charts,omitempty"`
-
 	OverrideKubeContext string            `yaml:"kubeContext,omitempty"`
 	OverrideNamespace   string            `yaml:"namespace,omitempty"`
 	OverrideChart       string            `yaml:"chart,omitempty"`
diff --git a/pkg/state/state_test.go b/pkg/state/state_test.go
index 9072ea56..59210312 100644
--- a/pkg/state/state_test.go
+++ b/pkg/state/state_test.go
@@ -58,13 +58,9 @@ func TestHelmState_applyDefaultsTo(t *testing.T) {
 	type fields struct {
 		BaseChartPath string
 		Context       string
-
-		// TODO: Remove this function once Helmfile v0.x
-		DeprecatedReleases []ReleaseSpec
-
-		Namespace    string
-		Repositories []RepositorySpec
-		Releases     []ReleaseSpec
+		Namespace     string
+		Repositories  []RepositorySpec
+		Releases      []ReleaseSpec
 	}
 	type args struct {
 		spec ReleaseSpec
@@ -89,12 +85,8 @@ func TestHelmState_applyDefaultsTo(t *testing.T) {
 	fieldsWithNamespace := fields{
 		BaseChartPath: ".",
 		Context:       "test_context",
-
-		// TODO: Remove this function once Helmfile v0.x
-		DeprecatedReleases: nil,
-
-		Namespace:    specWithNamespaceFromFields.Namespace,
-		Repositories: nil,
+		Namespace:     specWithNamespaceFromFields.Namespace,
+		Repositories:  nil,
 		Releases: []ReleaseSpec{
 			specWithNamespace,
 		},
@@ -148,10 +140,6 @@ func TestHelmState_applyDefaultsTo(t *testing.T) {
 			state := &HelmState{
 				basePath: tt.fields.BaseChartPath,
 				ReleaseSetSpec: ReleaseSetSpec{
-					// TODO: Remove this function once Helmfile v0.x
-					DeprecatedContext:  tt.fields.Context,
-					DeprecatedReleases: tt.fields.DeprecatedReleases,
-
 					OverrideNamespace: tt.fields.Namespace,
 					Repositories:      tt.fields.Repositories,
 					Releases:          tt.fields.Releases,
@@ -740,9 +728,6 @@ func TestHelmState_flagsForUpgrade(t *testing.T) {
 			state := &HelmState{
 				basePath: "./",
 				ReleaseSetSpec: ReleaseSetSpec{
-					// TODO: Remove this function once Helmfile v0.x
-					DeprecatedContext: "default",
-
 					Releases:     []ReleaseSpec{*tt.release},
 					HelmDefaults: tt.defaults,
 				},
@@ -904,9 +889,8 @@ func TestHelmState_flagsForTemplate(t *testing.T) {
 			state := &HelmState{
 				basePath: "./",
 				ReleaseSetSpec: ReleaseSetSpec{
-					DeprecatedContext: "default",
-					Releases:          []ReleaseSpec{*tt.release},
-					HelmDefaults:      tt.defaults,
+					Releases:     []ReleaseSpec{*tt.release},
+					HelmDefaults: tt.defaults,
 				},
 				valsRuntime: valsRuntime,
 			}
diff --git a/pkg/tmpl/context_funcs.go b/pkg/tmpl/context_funcs.go
index 12888a91..dac6be4a 100644
--- a/pkg/tmpl/context_funcs.go
+++ b/pkg/tmpl/context_funcs.go
@@ -19,7 +19,6 @@ import (
 	"github.com/helmfile/helmfile/pkg/envvar"
 	"github.com/helmfile/helmfile/pkg/helmexec"
 	"github.com/helmfile/helmfile/pkg/maputil"
-	"github.com/helmfile/helmfile/pkg/runtime"
 	"github.com/helmfile/helmfile/pkg/yaml"
 )
 
@@ -37,23 +36,10 @@ func (e DisableInsecureFeaturesError) Error() string {
 
 var (
 	disableInsecureFeatures bool
-
-	// TODO: Remove this function once Helmfile v0.x
-	skipInsecureTemplateFunctions bool
 )
 
 func init() {
 	disableInsecureFeatures, _ = strconv.ParseBool(os.Getenv(envvar.DisableInsecureFeatures))
-
-	// TODO: Remove this function once Helmfile v0.x
-	skipInsecureTemplateFunctions, _ = strconv.ParseBool(os.Getenv(envvar.SkipInsecureTemplateFunctions))
-	skipInsecureTemplateFunctions = func() bool {
-		if runtime.V1Mode {
-			return false
-		}
-		b, _ := strconv.ParseBool(os.Getenv(envvar.SkipInsecureTemplateFunctions))
-		return b
-	}()
 }
 
 func (c *Context) createFuncMap() template.FuncMap {
@@ -76,7 +62,7 @@ func (c *Context) createFuncMap() template.FuncMap {
 		"fetchSecretValue": fetchSecretValue,
 		"expandSecretRefs": fetchSecretValues,
 	}
-	if c.preRender || skipInsecureTemplateFunctions {
+	if c.preRender {
 		// disable potential side-effect template calls
 		funcMap["exec"] = func(string, []any, ...string) (string, error) {
 			return "", nil
diff --git a/pkg/tmpl/context_funcs_test.go b/pkg/tmpl/context_funcs_test.go
index e9e67e04..d1141d8e 100644
--- a/pkg/tmpl/context_funcs_test.go
+++ b/pkg/tmpl/context_funcs_test.go
@@ -46,30 +46,6 @@ func TestCreateFuncMap_DisabledInsecureFeatures(t *testing.T) {
 	disableInsecureFeatures = currentVal
 }
 
-// TODO: Remove this function once Helmfile v0.x
-func TestCreateFuncMap_SkipInsecureTemplateFunctions(t *testing.T) {
-	if runtime.V1Mode {
-		t.Logf("SkipInsecureTemplateFunctions is not supported in V1 mode")
-		return
-	}
-	currentVal := skipInsecureTemplateFunctions
-
-	{
-		skipInsecureTemplateFunctions = true
-		ctx := &Context{basePath: "."}
-		funcMaps := ctx.createFuncMap()
-		args := make([]any, 0)
-		actual1, err1 := funcMaps["exec"].(func(command string, args []any, inputs ...string) (string, error))("ls", args)
-		require.Equal(t, "", actual1)
-		require.ErrorIs(t, err1, nil)
-		actual2, err2 := funcMaps["readFile"].(func(filename string) (string, error))("context_funcs_test.go")
-		require.Equal(t, "", actual2)
-		require.ErrorIs(t, err2, nil)
-	}
-
-	skipInsecureTemplateFunctions = currentVal
-}
-
 func newFSExpecting(expectedFilename string, expected string) *filesystem.FileSystem {
 	return filesystem.FromFileSystem(filesystem.FileSystem{
 		ReadFile: func(filename string) ([]byte, error) {
diff --git a/test/integration/test-cases/chart-needs.sh b/test/integration/test-cases/chart-needs.sh
index 76cc3814..2ce8e63d 100644
--- a/test/integration/test-cases/chart-needs.sh
+++ b/test/integration/test-cases/chart-needs.sh
@@ -1,14 +1,7 @@
 chart_need_case_input_dir="${cases_dir}/chart-needs/input"
 chart_need_case_output_dir="${cases_dir}/chart-needs/output"
 
-config_file="helmfile.yaml"
-if [[ ${HELMFILE_V1MODE} = true ]]; then
-  pushd "${chart_need_case_input_dir}"
-  mv "${config_file}" "${config_file}.gotmpl"
-  config_file="${config_file}.gotmpl"
-  popd
-fi
-
+config_file="helmfile.yaml.gotmpl"
 chart_needs_tmp=$(mktemp -d)
 chart_needs_template_reverse=${chart_needs_tmp}/chart.needs.template.log
 chart_needs_lint_reverse=${chart_needs_tmp}/chart.needs.lint.log
diff --git a/test/integration/test-cases/chart-needs/input/helmfile.yaml b/test/integration/test-cases/chart-needs/input/helmfile.yaml.gotmpl
similarity index 100%
rename from test/integration/test-cases/chart-needs/input/helmfile.yaml
rename to test/integration/test-cases/chart-needs/input/helmfile.yaml.gotmpl
diff --git a/test/integration/test-cases/chartify-jsonPatches-and-strategicMergePatches.sh b/test/integration/test-cases/chartify-jsonPatches-and-strategicMergePatches.sh
index 2fd4e5d3..ea5d4a22 100644
--- a/test/integration/test-cases/chartify-jsonPatches-and-strategicMergePatches.sh
+++ b/test/integration/test-cases/chartify-jsonPatches-and-strategicMergePatches.sh
@@ -1,14 +1,7 @@
 chartify_jsonPatches_and_strategicMergePatches_case_input_dir="${cases_dir}/chartify-jsonPatches-and-strategicMergePatches/input"
 chartify_jsonPatches_and_strategicMergePatches_case_output_dir="${cases_dir}/chartify-jsonPatches-and-strategicMergePatches/output"
 
-config_file="helmfile.yaml"
-if [[ ${HELMFILE_V1MODE} = true ]]; then
-  pushd "${chartify_jsonPatches_and_strategicMergePatches_case_input_dir}"
-  mv "${config_file}" "${config_file}.gotmpl"
-  config_file="${config_file}.gotmpl"
-  popd
-fi
-
+config_file="helmfile.yaml.gotmpl"
 chartify_jsonPatches_and_strategicMergePatches_tmp=$(mktemp -d)
 chartify_jsonPatches_and_strategicMergePatches_template_reverse=${chartify_jsonPatches_and_strategicMergePatches_tmp}/chartify_jsonPatches_and_strategicMergePatches.template.log
 
diff --git a/test/integration/test-cases/chartify-jsonPatches-and-strategicMergePatches/input/helmfile.yaml b/test/integration/test-cases/chartify-jsonPatches-and-strategicMergePatches/input/helmfile.yaml.gotmpl
similarity index 100%
rename from test/integration/test-cases/chartify-jsonPatches-and-strategicMergePatches/input/helmfile.yaml
rename to test/integration/test-cases/chartify-jsonPatches-and-strategicMergePatches/input/helmfile.yaml.gotmpl
diff --git a/test/integration/test-cases/chartify.sh b/test/integration/test-cases/chartify.sh
index 963fbbd6..8c6e2d3a 100644
--- a/test/integration/test-cases/chartify.sh
+++ b/test/integration/test-cases/chartify.sh
@@ -1,14 +1,7 @@
 chartify_case_input_dir="${cases_dir}/chartify/input"
 chartify_case_output_dir="${cases_dir}/chartify/output"
 
-config_file="helmfile.yaml"
-if [[ ${HELMFILE_V1MODE} = true ]]; then
-  pushd "${chartify_case_input_dir}"
-  mv "${config_file}" "${config_file}.gotmpl"
-  config_file="${config_file}.gotmpl"
-  popd
-fi
-
+config_file="helmfile.yaml.gotmpl"
 chartify_tmp=$(mktemp -d)
 chartify_template_reverse=${chartify_tmp}/chartify.template.log
 
diff --git a/test/integration/test-cases/chartify/input/helmfile.yaml b/test/integration/test-cases/chartify/input/helmfile.yaml.gotmpl
similarity index 100%
rename from test/integration/test-cases/chartify/input/helmfile.yaml
rename to test/integration/test-cases/chartify/input/helmfile.yaml.gotmpl
diff --git a/test/integration/test-cases/cli-overwrite-environment-values.sh b/test/integration/test-cases/cli-overwrite-environment-values.sh
index 48d9f2de..8e51e159 100644
--- a/test/integration/test-cases/cli-overwrite-environment-values.sh
+++ b/test/integration/test-cases/cli-overwrite-environment-values.sh
@@ -6,24 +6,12 @@ cli_overwrite_environment_values_reverse=${cli_overwrite_environment_values_tmp}
 
 case_title="cli overwrite environment values"
 
-if [[ ${HELMFILE_V1MODE} = true ]]; then
-  test_start "$case_title for v1"
-  info "Comparing ${case_title} for v1 output ${cli_overwrite_environment_values_reverse} with ${cli_overwrite_environment_values_output_dir}/overwritten.yaml"
-  for i in $(seq 10); do
-      info "Comparing build/cli-overwrite-environment-values #$i"
-      ${helmfile} -f ${cli_overwrite_environment_values_input_dir}/input_v1.yaml.gotmpl template --state-values-set ns=test3 --state-values-set-string imageTag=1.23.3,zone="zone1,zone2" > ${cli_overwrite_environment_values_reverse} || fail "\"helmfile template\" shouldn't fail"
-      diff -u ${cli_overwrite_environment_values_output_dir}/output_v1.yaml ${cli_overwrite_environment_values_reverse} || fail "\"helmfile template\" should be consistent"
-      echo code=$?
-  done
-  test_pass "cli overwrite environment values for v1"
-else
-  test_start "${case_title}" 
-  info "Comparing ${case_title} output ${cli_overwrite_environment_values_reverse} with ${cli_overwrite_environment_values_output_dir}/overwritten.yaml"
-  for i in $(seq 10); do
-      info "Comparing build/cli-overwrite-environment-values #$i"
-      ${helmfile} -f ${cli_overwrite_environment_values_input_dir}/input_v1.yaml.gotmpl template --state-values-set ns=test3 --state-values-set-string imageTag=1.23.3,zone="zone1,zone2" > ${cli_overwrite_environment_values_reverse} || fail "\"helmfile template\" shouldn't fail"
-      diff -u ${cli_overwrite_environment_values_output_dir}/output_v1.yaml ${cli_overwrite_environment_values_reverse} || fail "\"helmfile template\" should be consistent"
-      echo code=$?
-  done
-  test_pass "${case_title}"
-fi
+test_start "$case_title"
+info "Comparing ${case_title} for output ${cli_overwrite_environment_values_reverse} with ${cli_overwrite_environment_values_output_dir}/overwritten.yaml"
+for i in $(seq 10); do
+    info "Comparing build/cli-overwrite-environment-values #$i"
+    ${helmfile} -f ${cli_overwrite_environment_values_input_dir}/input.yaml.gotmpl template --state-values-set ns=test3 --state-values-set-string imageTag=1.23.3,zone="zone1,zone2" > ${cli_overwrite_environment_values_reverse} || fail "\"helmfile template\" shouldn't fail"
+    diff -u ${cli_overwrite_environment_values_output_dir}/output.yaml ${cli_overwrite_environment_values_reverse} || fail "\"helmfile template\" should be consistent"
+    echo code=$?
+done
+test_pass "cli overwrite environment values for v1"
\ No newline at end of file
diff --git a/test/integration/test-cases/cli-overwrite-environment-values/input/input.yaml b/test/integration/test-cases/cli-overwrite-environment-values/input/input.yaml
deleted file mode 100644
index 28706d92..00000000
--- a/test/integration/test-cases/cli-overwrite-environment-values/input/input.yaml
+++ /dev/null
@@ -1,17 +0,0 @@
-environments:
-  default:
-    values:
-      - base.yaml
-      - override.yaml
-
-repositories:
-  - name: bitnami
-    url: https://charts.bitnami.com/bitnami
-
-releases:
-  - name: test
-    chart: bitnami/nginx
-    namespace: {{ .Values.ns }}
-    version: 13.2.27
-    values:
-      - values.yaml.gotmpl
diff --git a/test/integration/test-cases/cli-overwrite-environment-values/input/input_v1.yaml.gotmpl b/test/integration/test-cases/cli-overwrite-environment-values/input/input.yaml.gotmpl
similarity index 100%
rename from test/integration/test-cases/cli-overwrite-environment-values/input/input_v1.yaml.gotmpl
rename to test/integration/test-cases/cli-overwrite-environment-values/input/input.yaml.gotmpl
diff --git a/test/integration/test-cases/cli-overwrite-environment-values/output/output.yaml b/test/integration/test-cases/cli-overwrite-environment-values/output/output.yaml
index ae8f779c..ba0f5cd7 100644
--- a/test/integration/test-cases/cli-overwrite-environment-values/output/output.yaml
+++ b/test/integration/test-cases/cli-overwrite-environment-values/output/output.yaml
@@ -1,9 +1,3 @@
-Warning: environments and releases cannot be defined within the same YAML part. Use --- to extract the environments into a dedicated part
-Warning: environments and releases cannot be defined within the same YAML part. Use --- to extract the environments into a dedicated part
-Adding repo bitnami https://charts.bitnami.com/bitnami
-"bitnami" has been added to your repositories
-
-Templating release=test, chart=bitnami/nginx
 ---
 # Source: nginx/templates/svc.yaml
 apiVersion: v1
@@ -57,6 +51,7 @@ spec:
         app.kubernetes.io/instance: test
         app.kubernetes.io/managed-by: Helm
       annotations:
+        zone: "zone1,zone2"
     spec:
       
       automountServiceAccountToken: false
@@ -81,7 +76,7 @@ spec:
       initContainers:
       containers:
         - name: nginx
-          image: docker.io/bitnami/nginx:test3
+          image: docker.io/bitnami/nginx:1.23.3
           imagePullPolicy: "IfNotPresent"
           env:
             - name: BITNAMI_DEBUG
diff --git a/test/integration/test-cases/cli-overwrite-environment-values/output/output_v1.yaml b/test/integration/test-cases/cli-overwrite-environment-values/output/output_v1.yaml
deleted file mode 100644
index ba0f5cd7..00000000
--- a/test/integration/test-cases/cli-overwrite-environment-values/output/output_v1.yaml
+++ /dev/null
@@ -1,111 +0,0 @@
----
-# Source: nginx/templates/svc.yaml
-apiVersion: v1
-kind: Service
-metadata:
-  name: test-nginx
-  namespace: "test3"
-  labels:
-    app.kubernetes.io/name: nginx
-    helm.sh/chart: nginx-13.2.27
-    app.kubernetes.io/instance: test
-    app.kubernetes.io/managed-by: Helm
-  annotations:
-spec:
-  type: LoadBalancer
-  sessionAffinity: None
-  externalTrafficPolicy: "Cluster"
-  ports:
-    - name: http
-      port: 80
-      targetPort: http
-  selector:
-    app.kubernetes.io/name: nginx
-    app.kubernetes.io/instance: test
----
-# Source: nginx/templates/deployment.yaml
-apiVersion: apps/v1
-kind: Deployment
-metadata:
-  name: test-nginx
-  namespace: "test3"
-  labels:
-    app.kubernetes.io/name: nginx
-    helm.sh/chart: nginx-13.2.27
-    app.kubernetes.io/instance: test
-    app.kubernetes.io/managed-by: Helm
-spec:
-  replicas: 1
-  strategy:
-    rollingUpdate: {}
-    type: RollingUpdate
-  selector:
-    matchLabels:
-      app.kubernetes.io/name: nginx
-      app.kubernetes.io/instance: test
-  template:
-    metadata:
-      labels:
-        app.kubernetes.io/name: nginx
-        helm.sh/chart: nginx-13.2.27
-        app.kubernetes.io/instance: test
-        app.kubernetes.io/managed-by: Helm
-      annotations:
-        zone: "zone1,zone2"
-    spec:
-      
-      automountServiceAccountToken: false
-      shareProcessNamespace: false
-      serviceAccountName: default
-      affinity:
-        podAffinity:
-          
-        podAntiAffinity:
-          preferredDuringSchedulingIgnoredDuringExecution:
-            - podAffinityTerm:
-                labelSelector:
-                  matchLabels:
-                    app.kubernetes.io/name: nginx
-                    app.kubernetes.io/instance: test
-                topologyKey: kubernetes.io/hostname
-              weight: 1
-        nodeAffinity:
-          
-      hostNetwork: false
-      hostIPC: false
-      initContainers:
-      containers:
-        - name: nginx
-          image: docker.io/bitnami/nginx:1.23.3
-          imagePullPolicy: "IfNotPresent"
-          env:
-            - name: BITNAMI_DEBUG
-              value: "false"
-            - name: NGINX_HTTP_PORT_NUMBER
-              value: "8080"
-          envFrom:
-          ports:
-            - name: http
-              containerPort: 8080
-          livenessProbe:
-            failureThreshold: 6
-            initialDelaySeconds: 30
-            periodSeconds: 10
-            successThreshold: 1
-            timeoutSeconds: 5
-            tcpSocket:
-              port: http
-          readinessProbe:
-            failureThreshold: 3
-            initialDelaySeconds: 5
-            periodSeconds: 5
-            successThreshold: 1
-            timeoutSeconds: 3
-            tcpSocket:
-              port: http
-          resources:
-            limits: {}
-            requests: {}
-          volumeMounts:
-      volumes:
-
diff --git a/test/integration/test-cases/happypath.sh b/test/integration/test-cases/happypath.sh
index a9778a1d..2968a554 100644
--- a/test/integration/test-cases/happypath.sh
+++ b/test/integration/test-cases/happypath.sh
@@ -2,14 +2,7 @@ test_start "happypath - simple rollout of httpbin chart"
 
 happypath_case_input_dir="${cases_dir}/happypath/input"
 happypath_case_output_dir="${cases_dir}/happypath/output"
-config_file="happypath.yaml"
-
-if [[ ${HELMFILE_V1MODE} = true ]]; then
-  pushd "${happypath_case_input_dir}"
-  mv "${config_file}" "${config_file}.gotmpl"
-  config_file="${config_file}.gotmpl"
-  popd
-fi
+config_file="happypath.yaml.gotmpl"
 
 info "Diffing ${happypath_case_input_dir}/${config_file}"
 bash -c "${helmfile} -f ${happypath_case_input_dir}/${config_file} diff --detailed-exitcode; code="'$?'"; [ "'${code}'" -eq 2 ]" || fail "unexpected exit code returned by helmfile diff"
diff --git a/test/integration/test-cases/happypath/input/happypath.yaml b/test/integration/test-cases/happypath/input/happypath.yaml.gotmpl
similarity index 100%
rename from test/integration/test-cases/happypath/input/happypath.yaml
rename to test/integration/test-cases/happypath/input/happypath.yaml.gotmpl
diff --git a/test/integration/test-cases/postrender.sh b/test/integration/test-cases/postrender.sh
index 5a1a2aee..dfeab508 100644
--- a/test/integration/test-cases/postrender.sh
+++ b/test/integration/test-cases/postrender.sh
@@ -1,14 +1,7 @@
 postrender_case_input_dir="${cases_dir}/postrender/input"
 postrender_case_output_dir="${cases_dir}/postrender/output"
 
-config_file="helmfile.yaml"
-if [[ ${HELMFILE_V1MODE} = true ]]; then
-  pushd "${postrender_case_input_dir}"
-  mv "${config_file}" "${config_file}.gotmpl"
-  config_file="${config_file}.gotmpl"
-  popd
-fi
-
+config_file="helmfile.yaml.gotmpl"
 postrender_diff_out_file=${postrender_case_output_dir}/diff-result
 if [[ $EXTRA_HELMFILE_FLAGS == *--enable-live-output* ]]; then
     postrender_diff_out_file=${postrender_case_output_dir}/diff-result-live
diff --git a/test/integration/test-cases/postrender/input/helmfile.yaml b/test/integration/test-cases/postrender/input/helmfile.yaml.gotmpl
similarity index 100%
rename from test/integration/test-cases/postrender/input/helmfile.yaml
rename to test/integration/test-cases/postrender/input/helmfile.yaml.gotmpl
diff --git a/test/integration/test-cases/regression.sh b/test/integration/test-cases/regression.sh
index 8a68d491..bc2ea412 100644
--- a/test/integration/test-cases/regression.sh
+++ b/test/integration/test-cases/regression.sh
@@ -4,44 +4,20 @@ test_start "regression tests"
 regression_case_input_dir="${cases_dir}/regression/input"
 
 info "https://github.com/roboll/helmfile/issues/1857"
-config_file="issue.1857.yaml"
-if [[ ${HELMFILE_V1MODE} = true ]]; then
-  pushd "${regression_case_input_dir}"
-  mv "${config_file}" "${config_file}.gotmpl"
-  config_file="${config_file}.gotmpl"
-  popd
-fi
+config_file="issue.1857.yaml.gotmpl"
 (${helmfile} -f ${regression_case_input_dir}/${config_file} --state-values-set grafanaEnabled=true template | grep grafana 1>/dev/null) || fail "\"helmfile template\" shouldn't include grafana"
 ! (${helmfile} -f ${regression_case_input_dir}/${config_file} --state-values-set grafanaEnabled=false template | grep grafana) || fail "\"helmfile template\" shouldn't include grafana"
 
 info "https://github.com/roboll/helmfile/issues/1867"
-config_file="issue.1867.yaml"
-if [[ ${HELMFILE_V1MODE} = true ]]; then
-  pushd "${regression_case_input_dir}"
-  mv "${config_file}" "${config_file}.gotmpl"
-  config_file="${config_file}.gotmpl"
-  popd
-fi
+config_file="issue.1867.yaml.gotmpl"
 (${helmfile} -f ${regression_case_input_dir}/${config_file} template 1>/dev/null) || fail "\"helmfile template\" shouldn't fail"
 
 info "https://github.com/roboll/helmfile/issues/2118"
-config_file="issue.2118.yaml"
-if [[ ${HELMFILE_V1MODE} = true ]]; then
-  pushd "${regression_case_input_dir}"
-  mv "${config_file}" "${config_file}.gotmpl"
-  config_file="${config_file}.gotmpl"
-  popd
-fi
+config_file="issue.2118.yaml.gotmpl"
 (${helmfile} -f ${regression_case_input_dir}/${config_file} template 1>/dev/null) || fail "\"helmfile template\" shouldn't fail"
 
 info "https://github.com/helmfile/helmfile/issues/1682"
-config_file="issue.1682.yaml"
-if [[ ${HELMFILE_V1MODE} = true ]]; then
-  pushd "${regression_case_input_dir}"
-  mv "${config_file}" "${config_file}.gotmpl"
-  config_file="${config_file}.gotmpl"
-  popd
-fi
+config_file="issue.1682.yaml.gotmpl"
 (${helmfile} -f ${regression_case_input_dir}/${config_file} deps 1>/dev/null) || fail "\"helmfile deps\" shouldn't fail"
 
 test_pass "regression tests"
\ No newline at end of file
diff --git a/test/integration/test-cases/regression/input/issue.1682.yaml b/test/integration/test-cases/regression/input/issue.1682.yaml.gotmpl
similarity index 100%
rename from test/integration/test-cases/regression/input/issue.1682.yaml
rename to test/integration/test-cases/regression/input/issue.1682.yaml.gotmpl
diff --git a/test/integration/test-cases/regression/input/issue.1857.yaml b/test/integration/test-cases/regression/input/issue.1857.yaml.gotmpl
similarity index 100%
rename from test/integration/test-cases/regression/input/issue.1857.yaml
rename to test/integration/test-cases/regression/input/issue.1857.yaml.gotmpl
diff --git a/test/integration/test-cases/regression/input/issue.1867.yaml b/test/integration/test-cases/regression/input/issue.1867.yaml.gotmpl
similarity index 100%
rename from test/integration/test-cases/regression/input/issue.1867.yaml
rename to test/integration/test-cases/regression/input/issue.1867.yaml.gotmpl
diff --git a/test/integration/test-cases/regression/input/issue.2118.yaml b/test/integration/test-cases/regression/input/issue.2118.yaml.gotmpl
similarity index 100%
rename from test/integration/test-cases/regression/input/issue.2118.yaml
rename to test/integration/test-cases/regression/input/issue.2118.yaml.gotmpl
diff --git a/test/integration/test-cases/secretssops.sh b/test/integration/test-cases/secretssops.sh
index b4c53f79..b5085275 100644
--- a/test/integration/test-cases/secretssops.sh
+++ b/test/integration/test-cases/secretssops.sh
@@ -4,13 +4,7 @@ sops="sops --hc-vault-transit $VAULT_ADDR/v1/sops/keys/key"
 
 secretssops_case_input_dir="${cases_dir}/secretssops/input"
 secretssops_case_output_dir="${cases_dir}/secretssops/output"
-config_file="secretssops.yaml"
-if [[ ${HELMFILE_V1MODE} = true ]]; then
-  pushd "${secretssops_case_input_dir}"
-  mv "${config_file}" "${config_file}.gotmpl"
-  config_file="${config_file}.gotmpl"
-  popd
-fi
+config_file="secretssops.yaml.gotmpl"
 
 mkdir -p ${secretssops_case_input_dir}/tmp
 
diff --git a/test/integration/test-cases/secretssops/input/secretssops.yaml b/test/integration/test-cases/secretssops/input/secretssops.yaml.gotmpl
similarity index 100%
rename from test/integration/test-cases/secretssops/input/secretssops.yaml
rename to test/integration/test-cases/secretssops/input/secretssops.yaml.gotmpl
diff --git a/test/integration/test-cases/v1-subhelmfile-multi-bases-with-array-values.sh b/test/integration/test-cases/v1-subhelmfile-multi-bases-with-array-values.sh
index a234fb19..ed69e186 100644
--- a/test/integration/test-cases/v1-subhelmfile-multi-bases-with-array-values.sh
+++ b/test/integration/test-cases/v1-subhelmfile-multi-bases-with-array-values.sh
@@ -1,19 +1,15 @@
-if [[ ${HELMFILE_V1MODE} = true ]]; then
-  v1_subhelmfile_multi_bases_with_array_values_input_dir="${cases_dir}/v1-subhelmfile-multi-bases-with-array-values/input"
-  v1_subhelmfile_multi_bases_with_array_values_output_dir="${cases_dir}/v1-subhelmfile-multi-bases-with-array-values/output"
+v1_subhelmfile_multi_bases_with_array_values_input_dir="${cases_dir}/v1-subhelmfile-multi-bases-with-array-values/input"
+v1_subhelmfile_multi_bases_with_array_values_output_dir="${cases_dir}/v1-subhelmfile-multi-bases-with-array-values/output"
 
-  yaml_overwrite_tmp=$(mktemp -d)
-  yaml_overwrite_reverse=${yaml_overwrite_tmp}/helmfile_template_result
+yaml_overwrite_tmp=$(mktemp -d)
+yaml_overwrite_reverse=${yaml_overwrite_tmp}/helmfile_template_result
 
-  test_start "v1 subhelmfile multi bases with array values"
-  info "Comparing v1 subhelmfile multi bases with array values output ${yaml_overwrite_reverse} with ${v1_subhelmfile_multi_bases_with_array_values_output_dir}/result"
-  for i in $(seq 10); do
-      info "Comparing build/v1-subhelmfile-multi-bases-with-array-values #$i"
-      ${helmfile} -f ${v1_subhelmfile_multi_bases_with_array_values_input_dir}/helmfile.yaml.gotmpl template -e dev &> ${yaml_overwrite_reverse} || fail "\"helmfile template\" shouldn't fail"
-      diff -u ${v1_subhelmfile_multi_bases_with_array_values_output_dir}/result ${yaml_overwrite_reverse} || fail "\"helmfile template\" should be consistent"
-      echo code=$?
-  done
-  test_pass "v1 subhelmfile multi bases with array values"
-else
-  test_pass "[skipped] v1 subhelmfile multi bases with array values"
-fi
\ No newline at end of file
+test_start "v1 subhelmfile multi bases with array values"
+info "Comparing v1 subhelmfile multi bases with array values output ${yaml_overwrite_reverse} with ${v1_subhelmfile_multi_bases_with_array_values_output_dir}/result"
+for i in $(seq 10); do
+    info "Comparing build/v1-subhelmfile-multi-bases-with-array-values #$i"
+    ${helmfile} -f ${v1_subhelmfile_multi_bases_with_array_values_input_dir}/helmfile.yaml.gotmpl template -e dev &> ${yaml_overwrite_reverse} || fail "\"helmfile template\" shouldn't fail"
+    diff -u ${v1_subhelmfile_multi_bases_with_array_values_output_dir}/result ${yaml_overwrite_reverse} || fail "\"helmfile template\" should be consistent"
+    echo code=$?
+done
+test_pass "v1 subhelmfile multi bases with array values"
\ No newline at end of file
diff --git a/test/integration/test-cases/yaml-overwrite.sh b/test/integration/test-cases/yaml-overwrite.sh
index a4a45825..617d8f97 100644
--- a/test/integration/test-cases/yaml-overwrite.sh
+++ b/test/integration/test-cases/yaml-overwrite.sh
@@ -1,19 +1,15 @@
-if [[ ${HELMFILE_V1MODE} = true ]]; then
-  yaml_overwrite_case_input_dir="${cases_dir}/yaml-overwrite/input"
-  yaml_overwrite_case_output_dir="${cases_dir}/yaml-overwrite/output"
+yaml_overwrite_case_input_dir="${cases_dir}/yaml-overwrite/input"
+yaml_overwrite_case_output_dir="${cases_dir}/yaml-overwrite/output"
 
-  yaml_overwrite_tmp=$(mktemp -d)
-  yaml_overwrite_reverse=${yaml_overwrite_tmp}/yaml.override.build.yaml
+yaml_overwrite_tmp=$(mktemp -d)
+yaml_overwrite_reverse=${yaml_overwrite_tmp}/yaml.override.build.yaml
 
-  test_start "yaml overwrite feature"
-  info "Comparing yaml overwrite feature output ${yaml_overwrite_reverse} with ${yaml_overwrite_case_output_dir}/overwritten.yaml"
-  for i in $(seq 10); do
-      info "Comparing build/yaml-overwrite #$i"
-      ${helmfile} -f ${yaml_overwrite_case_input_dir}/issue.657.yaml.gotmpl template --skip-deps > ${yaml_overwrite_reverse} || fail "\"helmfile template\" shouldn't fail"
-      ./dyff between -bs ${yaml_overwrite_case_output_dir}/overwritten.yaml ${yaml_overwrite_reverse} || fail "\"helmfile template\" should be consistent"
-      echo code=$?
-  done
-  test_pass "yaml overwrite feature"
-else
-  test_pass "[skipped] yaml overwrite feature"
-fi
\ No newline at end of file
+test_start "yaml overwrite feature"
+info "Comparing yaml overwrite feature output ${yaml_overwrite_reverse} with ${yaml_overwrite_case_output_dir}/overwritten.yaml"
+for i in $(seq 10); do
+    info "Comparing build/yaml-overwrite #$i"
+    ${helmfile} -f ${yaml_overwrite_case_input_dir}/issue.657.yaml.gotmpl template --skip-deps > ${yaml_overwrite_reverse} || fail "\"helmfile template\" shouldn't fail"
+    ./dyff between -bs ${yaml_overwrite_case_output_dir}/overwritten.yaml ${yaml_overwrite_reverse} || fail "\"helmfile template\" should be consistent"
+    echo code=$?
+done
+test_pass "yaml overwrite feature"
\ No newline at end of file