diff --git a/pkg/envvar/const.go b/pkg/envvar/const.go
index 7fa9ee82..17e89926 100644
--- a/pkg/envvar/const.go
+++ b/pkg/envvar/const.go
@@ -1,15 +1,18 @@
 package envvar
 
 const (
-	DisableInsecureFeatures       = "HELMFILE_DISABLE_INSECURE_FEATURES"
-	DisableRunnerUniqueID         = "HELMFILE_DISABLE_RUNNER_UNIQUE_ID"
+	DisableInsecureFeatures = "HELMFILE_DISABLE_INSECURE_FEATURES"
+
+	// TODO: Remove this function once Helmfile v0.x
 	SkipInsecureTemplateFunctions = "HELMFILE_SKIP_INSECURE_TEMPLATE_FUNCTIONS"
-	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"
+
+	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"
 )
diff --git a/pkg/tmpl/context_funcs.go b/pkg/tmpl/context_funcs.go
index 0278df69..2e618ca5 100644
--- a/pkg/tmpl/context_funcs.go
+++ b/pkg/tmpl/context_funcs.go
@@ -19,6 +19,7 @@ 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"
 )
 
@@ -35,13 +36,24 @@ func (e DisableInsecureFeaturesError) Error() string {
 }
 
 var (
-	disableInsecureFeatures       bool
+	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 {
@@ -86,6 +98,9 @@ func (c *Context) createFuncMap() template.FuncMap {
 		funcMap["exec"] = func(string, []any, ...string) (string, error) {
 			return "", DisableInsecureFeaturesErr
 		}
+		funcMap["envExec"] = func(map[string]any, string, []any, ...string) (string, error) {
+			return "", DisableInsecureFeaturesErr
+		}
 		funcMap["readFile"] = func(string) (string, error) {
 			return "", DisableInsecureFeaturesErr
 		}
diff --git a/pkg/tmpl/context_funcs_test.go b/pkg/tmpl/context_funcs_test.go
index a754b673..e9e67e04 100644
--- a/pkg/tmpl/context_funcs_test.go
+++ b/pkg/tmpl/context_funcs_test.go
@@ -46,7 +46,12 @@ 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
 
 	{