diff --git a/controllers/helmrelease_controller.go b/controllers/helmrelease_controller.go
index a39713df1..5115ac054 100644
--- a/controllers/helmrelease_controller.go
+++ b/controllers/helmrelease_controller.go
@@ -52,6 +52,7 @@ import (
 	"github.com/fluxcd/pkg/runtime/events"
 	"github.com/fluxcd/pkg/runtime/metrics"
 	"github.com/fluxcd/pkg/runtime/predicates"
+	"github.com/fluxcd/pkg/runtime/transform"
 	sourcev1 "github.com/fluxcd/source-controller/api/v1beta1"
 
 	v2 "github.com/fluxcd/helm-controller/api/v2beta1"
@@ -588,7 +589,7 @@ func (r *HelmReleaseReconciler) composeValues(ctx context.Context, hr v2.HelmRel
 			if err != nil {
 				return nil, fmt.Errorf("unable to read values from key '%s' in %s '%s': %w", v.GetValuesKey(), v.Kind, namespacedName, err)
 			}
-			result = util.MergeMaps(result, values)
+			result = transform.MergeMaps(result, values)
 		default:
 			// TODO(hidde): this is a bit of hack, as it mimics the way the option string is passed
 			// 	to Helm from a CLI perspective. Given the parser is however not publicly accessible
@@ -599,7 +600,7 @@ func (r *HelmReleaseReconciler) composeValues(ctx context.Context, hr v2.HelmRel
 			}
 		}
 	}
-	return util.MergeMaps(result, hr.GetValues()), nil
+	return transform.MergeMaps(result, hr.GetValues()), nil
 }
 
 // reconcileDelete deletes the v1beta1.HelmChart of the v2beta1.HelmRelease,
diff --git a/go.mod b/go.mod
index 29e2ae664..7f1a43948 100644
--- a/go.mod
+++ b/go.mod
@@ -8,7 +8,7 @@ require (
 	github.com/fluxcd/helm-controller/api v0.7.0
 	github.com/fluxcd/pkg/apis/kustomize v0.0.1
 	github.com/fluxcd/pkg/apis/meta v0.8.0
-	github.com/fluxcd/pkg/runtime v0.8.1
+	github.com/fluxcd/pkg/runtime v0.8.2
 	github.com/fluxcd/source-controller/api v0.8.0
 	github.com/go-logr/logr v0.3.0
 	github.com/onsi/ginkgo v1.14.1
diff --git a/go.sum b/go.sum
index f1a904ad3..c2ff1a7e3 100644
--- a/go.sum
+++ b/go.sum
@@ -248,8 +248,8 @@ github.com/fluxcd/pkg/apis/meta v0.7.0/go.mod h1:yHuY8kyGHYz22I0jQzqMMGCcHViuzC/
 github.com/fluxcd/pkg/apis/meta v0.8.0 h1:wqWpUsxhKHB1ZztcvOz+vnyhdKW9cWmjFp8Vci/XOdk=
 github.com/fluxcd/pkg/apis/meta v0.8.0/go.mod h1:yHuY8kyGHYz22I0jQzqMMGCcHViuzC/WPdo9Gisk8Po=
 github.com/fluxcd/pkg/runtime v0.6.2/go.mod h1:RuqYOYCvBJwo4rg83d28WOt2vfSaemuZCVpUagAjWQc=
-github.com/fluxcd/pkg/runtime v0.8.1 h1:8UxNz7GeI/HC3U5tpNCfrjRx2V7UjUegQOwCsd+EWxk=
-github.com/fluxcd/pkg/runtime v0.8.1/go.mod h1:tQwEN+RESjJmtwSSv7I+6bkNM9raIXpGsCjruaIVX6A=
+github.com/fluxcd/pkg/runtime v0.8.2 h1:NeQPw9srRH4zmu2eM+NJ9QdJMd0RcyOr4j5WiWQU8as=
+github.com/fluxcd/pkg/runtime v0.8.2/go.mod h1:tQwEN+RESjJmtwSSv7I+6bkNM9raIXpGsCjruaIVX6A=
 github.com/fluxcd/source-controller/api v0.8.0 h1:jOgeOwCLXzmjinRiDT7e/IuSB7WNZMgrUwMLJm09K/o=
 github.com/fluxcd/source-controller/api v0.8.0/go.mod h1:u2sdc/QDm0tzXHL7mZVj928hc3MMU+4mKCuAQg+94Bk=
 github.com/form3tech-oss/jwt-go v3.2.2+incompatible/go.mod h1:pbq4aXjuKjdthFRnoDwaVPLA+WlJuPGy+QneDUgJi2k=
diff --git a/internal/util/util.go b/internal/util/util.go
index 24ec80ba2..b15c1b185 100644
--- a/internal/util/util.go
+++ b/internal/util/util.go
@@ -26,30 +26,6 @@ import (
 	"sigs.k8s.io/controller-runtime/pkg/client"
 )
 
-// MergeMaps merges map b into given map a and returns the result.
-// It allows overwrites of map values with flat values, and vice versa.
-// This is copied from https://github.com/helm/helm/blob/v3.3.0/pkg/cli/values/options.go#L88,
-// as the public chartutil.CoalesceTables function does not allow
-// overwriting maps with flat values.
-func MergeMaps(a, b map[string]interface{}) map[string]interface{} {
-	out := make(map[string]interface{}, len(a))
-	for k, v := range a {
-		out[k] = v
-	}
-	for k, v := range b {
-		if v, ok := v.(map[string]interface{}); ok {
-			if bv, ok := out[k]; ok {
-				if bv, ok := bv.(map[string]interface{}); ok {
-					out[k] = MergeMaps(bv, v)
-					continue
-				}
-			}
-		}
-		out[k] = v
-	}
-	return out
-}
-
 // ValuesChecksum calculates and returns the SHA1 checksum for the
 // given chartutil.Values.
 func ValuesChecksum(values chartutil.Values) string {
diff --git a/internal/util/util_test.go b/internal/util/util_test.go
index 062002ed5..1dabf4fe4 100644
--- a/internal/util/util_test.go
+++ b/internal/util/util_test.go
@@ -17,68 +17,12 @@ limitations under the License.
 package util
 
 import (
-	"reflect"
 	"testing"
 
 	"helm.sh/helm/v3/pkg/chartutil"
 	"helm.sh/helm/v3/pkg/release"
 )
 
-func TestMergeMaps(t *testing.T) {
-	nestedMap := map[string]interface{}{
-		"foo": "bar",
-		"baz": map[string]string{
-			"cool": "stuff",
-		},
-	}
-	anotherNestedMap := map[string]interface{}{
-		"foo": "bar",
-		"baz": map[string]string{
-			"cool":    "things",
-			"awesome": "stuff",
-		},
-	}
-	flatMap := map[string]interface{}{
-		"foo": "bar",
-		"baz": "stuff",
-	}
-	anotherFlatMap := map[string]interface{}{
-		"testing": "fun",
-	}
-
-	testMap := MergeMaps(flatMap, nestedMap)
-	equal := reflect.DeepEqual(testMap, nestedMap)
-	if !equal {
-		t.Errorf("Expected a nested map to overwrite a flat value. Expected: %v, got %v", nestedMap, testMap)
-	}
-
-	testMap = MergeMaps(nestedMap, flatMap)
-	equal = reflect.DeepEqual(testMap, flatMap)
-	if !equal {
-		t.Errorf("Expected a flat value to overwrite a map. Expected: %v, got %v", flatMap, testMap)
-	}
-
-	testMap = MergeMaps(nestedMap, anotherNestedMap)
-	equal = reflect.DeepEqual(testMap, anotherNestedMap)
-	if !equal {
-		t.Errorf("Expected a nested map to overwrite another nested map. Expected: %v, got %v", anotherNestedMap, testMap)
-	}
-
-	testMap = MergeMaps(anotherFlatMap, anotherNestedMap)
-	expectedMap := map[string]interface{}{
-		"testing": "fun",
-		"foo":     "bar",
-		"baz": map[string]string{
-			"cool":    "things",
-			"awesome": "stuff",
-		},
-	}
-	equal = reflect.DeepEqual(testMap, expectedMap)
-	if !equal {
-		t.Errorf("Expected a map with different keys to merge properly with another map. Expected: %v, got %v", expectedMap, testMap)
-	}
-}
-
 func TestValuesChecksum(t *testing.T) {
 	tests := []struct {
 		name   string