diff --git a/pkg/state/chart_dependency.go b/pkg/state/chart_dependency.go
index 60101c8a..7f88081c 100644
--- a/pkg/state/chart_dependency.go
+++ b/pkg/state/chart_dependency.go
@@ -129,6 +129,20 @@ func (d *ResolvedDependencies) Get(chart, versionConstraint string) (string, err
 	return "", fmt.Errorf("no resolved dependency found for \"%s\", running \"helmfile deps\" may resolve the issue", chart)
 }
 
+func dedupResolvedDependencies(deps []ResolvedChartDependency) []ResolvedChartDependency {
+	seen := map[string]bool{}
+	result := make([]ResolvedChartDependency, 0, len(deps))
+	for _, dep := range deps {
+		key := dep.ChartName + "|" + dep.Repository + "|" + dep.Version
+		if seen[key] {
+			continue
+		}
+		seen[key] = true
+		result = append(result, dep)
+	}
+	return result
+}
+
 func (st *HelmState) mergeLockedDependencies() (*HelmState, error) {
 	filename, unresolved := getUnresolvedDependenciess(st)
 
@@ -369,6 +383,8 @@ func (m *chartDependencyManager) doUpdate(chartLockFile string, unresolved *Unre
 		return lockedReqs.ResolvedDependencies[i].ChartName < lockedReqs.ResolvedDependencies[j].ChartName
 	})
 
+	lockedReqs.ResolvedDependencies = dedupResolvedDependencies(lockedReqs.ResolvedDependencies)
+
 	lockedReqs.Version = version.Version()
 
 	updatedLockFileContent, err = yaml.Marshal(lockedReqs)
diff --git a/pkg/state/chart_dependency_test.go b/pkg/state/chart_dependency_test.go
index 23c97c5c..70585b1c 100644
--- a/pkg/state/chart_dependency_test.go
+++ b/pkg/state/chart_dependency_test.go
@@ -6,6 +6,69 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
+func TestDedupResolvedDependencies(t *testing.T) {
+	tests := []struct {
+		name     string
+		input    []ResolvedChartDependency
+		expected []ResolvedChartDependency
+	}{
+		{
+			name: "no duplicates",
+			input: []ResolvedChartDependency{
+				{ChartName: "app-template", Repository: "https://example.com", Version: "4.6.2"},
+				{ChartName: "redis", Repository: "https://charts.bitnami.com/bitnami", Version: "17.0.7"},
+			},
+			expected: []ResolvedChartDependency{
+				{ChartName: "app-template", Repository: "https://example.com", Version: "4.6.2"},
+				{ChartName: "redis", Repository: "https://charts.bitnami.com/bitnami", Version: "17.0.7"},
+			},
+		},
+		{
+			name: "duplicates removed",
+			input: []ResolvedChartDependency{
+				{ChartName: "app-template", Repository: "https://example.com", Version: "4.6.2"},
+				{ChartName: "app-template", Repository: "https://example.com", Version: "4.6.2"},
+			},
+			expected: []ResolvedChartDependency{
+				{ChartName: "app-template", Repository: "https://example.com", Version: "4.6.2"},
+			},
+		},
+		{
+			name: "same chart different versions kept",
+			input: []ResolvedChartDependency{
+				{ChartName: "app-template", Repository: "https://example.com", Version: "4.6.2"},
+				{ChartName: "app-template", Repository: "https://example.com", Version: "4.6.1"},
+			},
+			expected: []ResolvedChartDependency{
+				{ChartName: "app-template", Repository: "https://example.com", Version: "4.6.2"},
+				{ChartName: "app-template", Repository: "https://example.com", Version: "4.6.1"},
+			},
+		},
+		{
+			name: "same chart different repos kept",
+			input: []ResolvedChartDependency{
+				{ChartName: "app-template", Repository: "https://example.com", Version: "4.6.2"},
+				{ChartName: "app-template", Repository: "https://other.com", Version: "4.6.2"},
+			},
+			expected: []ResolvedChartDependency{
+				{ChartName: "app-template", Repository: "https://example.com", Version: "4.6.2"},
+				{ChartName: "app-template", Repository: "https://other.com", Version: "4.6.2"},
+			},
+		},
+		{
+			name:     "empty input",
+			input:    []ResolvedChartDependency{},
+			expected: []ResolvedChartDependency{},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := dedupResolvedDependencies(tt.input)
+			require.Equal(t, tt.expected, result)
+		})
+	}
+}
+
 func TestGetUnresolvedDependenciess(t *testing.T) {
 	tests := []struct {
 		name       string