diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index eef441da..448fecb9 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -147,7 +147,7 @@ jobs:
         with:
           name: built-binaries-${{ github.run_id }}
       - name: install semver
-        run: go install github.com/ffurrer2/semver/v2/cmd/semver@latest
+        run: go install github.com/ffurrer2/semver/v2/cmd/semver@v2.12.0
       - name: Extract tar to get built binaries
         run: tar -xvf built-binaries.tar
       - name: Display built binaries
diff --git a/pkg/state/helmx.go b/pkg/state/helmx.go
index 779bffd2..988afc08 100644
--- a/pkg/state/helmx.go
+++ b/pkg/state/helmx.go
@@ -257,6 +257,9 @@ func (st *HelmState) appendCascadeFlags(flags []string, helm helmexec.Interface,
 
 // append hide-notes flags to helm flags
 func (st *HelmState) appendHideNotesFlags(flags []string, helm helmexec.Interface, ops *SyncOpts) []string {
+	if ops == nil {
+		return flags
+	}
 	// see https://github.com/helm/helm/releases/tag/v3.16.0
 	if !helm.IsVersionAtLeast("3.16.0") {
 		return flags
diff --git a/pkg/state/helmx_test.go b/pkg/state/helmx_test.go
index 80b8d5fe..d4cab5ff 100644
--- a/pkg/state/helmx_test.go
+++ b/pkg/state/helmx_test.go
@@ -442,6 +442,15 @@ func TestAppendHideNotesFlags(t *testing.T) {
 				expected: []string{"--hide-notes"},
 			},
 		},
+		{
+			name: "no hide-notes when ops is nil",
+			args: args{
+				flags:    []string{},
+				helm:     testutil.NewVersionHelmExec("3.16.0"),
+				opt:      nil,
+				expected: []string{},
+			},
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
diff --git a/pkg/state/state.go b/pkg/state/state.go
index 046031e0..431864ea 100644
--- a/pkg/state/state.go
+++ b/pkg/state/state.go
@@ -3451,8 +3451,12 @@ func (st *HelmState) flagsForUpgrade(helm helmexec.Interface, release *ReleaseSp
 
 	flags = append(flags, st.timeoutFlags(release, opt)...)
 
-	if release.Force != nil && *release.Force || release.Force == nil && st.HelmDefaults.Force {
-		flags = append(flags, "--force")
+	if (release.Force != nil && *release.Force) || (release.Force == nil && st.HelmDefaults.Force) {
+		if helm.IsHelm4() {
+			flags = append(flags, "--force-replace")
+		} else {
+			flags = append(flags, "--force")
+		}
 	}
 
 	if release.RecreatePods != nil && *release.RecreatePods || release.RecreatePods == nil && st.HelmDefaults.RecreatePods {
diff --git a/pkg/state/state_test.go b/pkg/state/state_test.go
index 21e51643..9fc5d893 100644
--- a/pkg/state/state_test.go
+++ b/pkg/state/state_test.go
@@ -261,10 +261,12 @@ func TestHelmState_flagsForUpgrade(t *testing.T) {
 			},
 		},
 		{
-			name: "force",
+			name: "force-helm3",
 			defaults: HelmSpec{
-				Force: false,
+				Force:           false,
+				CreateNamespace: &disable,
 			},
+			version: semver.MustParse("3.10.0"),
 			release: &ReleaseSpec{
 				Chart:     "test/chart",
 				Version:   "0.1",
@@ -279,10 +281,32 @@ func TestHelmState_flagsForUpgrade(t *testing.T) {
 			},
 		},
 		{
-			name: "force-from-default",
+			name: "force-helm4",
 			defaults: HelmSpec{
-				Force: true,
+				Force:           false,
+				CreateNamespace: &disable,
 			},
+			version: semver.MustParse("4.0.0"),
+			release: &ReleaseSpec{
+				Chart:     "test/chart",
+				Version:   "0.1",
+				Force:     &enable,
+				Name:      "test-charts",
+				Namespace: "test-namespace",
+			},
+			want: []string{
+				"--version", "0.1",
+				"--force-replace",
+				"--namespace", "test-namespace",
+			},
+		},
+		{
+			name: "force-from-default-helm3",
+			defaults: HelmSpec{
+				Force:           true,
+				CreateNamespace: &disable,
+			},
+			version: semver.MustParse("3.10.0"),
 			release: &ReleaseSpec{
 				Chart:     "test/chart",
 				Version:   "0.1",
@@ -295,6 +319,63 @@ func TestHelmState_flagsForUpgrade(t *testing.T) {
 				"--namespace", "test-namespace",
 			},
 		},
+		{
+			name: "force-from-default-helm4",
+			defaults: HelmSpec{
+				Force:           true,
+				CreateNamespace: &disable,
+			},
+			version: semver.MustParse("4.0.0"),
+			release: &ReleaseSpec{
+				Chart:     "test/chart",
+				Version:   "0.1",
+				Force:     &disable,
+				Name:      "test-charts",
+				Namespace: "test-namespace",
+			},
+			want: []string{
+				"--version", "0.1",
+				"--namespace", "test-namespace",
+			},
+		},
+		{
+			name: "force-from-default-nil-force-helm3",
+			defaults: HelmSpec{
+				Force:           true,
+				CreateNamespace: &disable,
+			},
+			version: semver.MustParse("3.10.0"),
+			release: &ReleaseSpec{
+				Chart:     "test/chart",
+				Version:   "0.1",
+				Name:      "test-charts",
+				Namespace: "test-namespace",
+			},
+			want: []string{
+				"--version", "0.1",
+				"--force",
+				"--namespace", "test-namespace",
+			},
+		},
+		{
+			name: "force-from-default-nil-force-helm4",
+			defaults: HelmSpec{
+				Force:           true,
+				CreateNamespace: &disable,
+			},
+			version: semver.MustParse("4.0.0"),
+			release: &ReleaseSpec{
+				Chart:     "test/chart",
+				Version:   "0.1",
+				Name:      "test-charts",
+				Namespace: "test-namespace",
+			},
+			want: []string{
+				"--version", "0.1",
+				"--force-replace",
+				"--namespace", "test-namespace",
+			},
+		},
 		{
 			name: "recreate-pods",
 			defaults: HelmSpec{