diff --git a/cli/cmd/definition.go b/cli/cmd/definition.go
index 2bb041c..d909773 100644
--- a/cli/cmd/definition.go
+++ b/cli/cmd/definition.go
@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"net/url"
 	"os"
 	"path/filepath"
 	"strconv"
@@ -386,6 +387,7 @@ Examples:
   stackctl definition update-chart 1 5 --chart-path /charts/kvk-core
   stackctl definition update-chart 1 5 --deploy-order 6
   stackctl definition update-chart 1 5 --source-repo-url https://dev.azure.com/org/project/_git/repo
+  stackctl definition update-chart 1 5 --repository-url oci://acr.example.com/helm
   stackctl definition update-chart 1 5 --file values.yaml`,
 	Args:         cobra.ExactArgs(2),
 	SilenceUsage: true,
@@ -402,11 +404,24 @@ Examples:
 		chartPath, _ := cmd.Flags().GetString("chart-path")
 		chartVersion, _ := cmd.Flags().GetString("chart-version")
 		sourceRepoURL, _ := cmd.Flags().GetString("source-repo-url")
+		repositoryURL, _ := cmd.Flags().GetString("repository-url")
 		deployOrder, _ := cmd.Flags().GetInt("deploy-order")
 		valuesFile, _ := cmd.Flags().GetString("file")
 
-		if chartPath == "" && chartVersion == "" && sourceRepoURL == "" && deployOrder < 0 && valuesFile == "" {
-			return fmt.Errorf("at least one of --chart-path, --chart-version, --source-repo-url, --deploy-order, or --file must be specified")
+		if chartPath == "" && chartVersion == "" && sourceRepoURL == "" && repositoryURL == "" && deployOrder < 0 && valuesFile == "" {
+			return fmt.Errorf("at least one of --chart-path, --chart-version, --source-repo-url, --repository-url, --deploy-order, or --file must be specified")
+		}
+
+		if repositoryURL != "" {
+			u, err := url.Parse(repositoryURL)
+			if err != nil || u.Scheme == "" || u.Host == "" {
+				return fmt.Errorf("--repository-url %q is not a valid URL", repositoryURL)
+			}
+			switch u.Scheme {
+			case "oci", "http", "https":
+			default:
+				return fmt.Errorf("--repository-url scheme %q is not supported (use oci, http, or https)", u.Scheme)
+			}
 		}
 
 		if valuesFile != "" {
@@ -427,11 +442,18 @@ Examples:
 			return fmt.Errorf("fetching current chart config: %w", err)
 		}
 
+		// Seed every field from the current record before PUT so backends
+		// that treat the payload as a full replacement do not wipe values
+		// the user didn't intend to change.
 		req := types.UpdateChartConfigRequest{
-			ChartName:     current.ChartName,
-			ChartVersion:  current.ChartVersion,
-			SourceRepoURL: current.SourceRepoURL,
-			DefaultValues: current.DefaultValues,
+			ChartName:       current.ChartName,
+			RepositoryURL:   current.RepoURL,
+			ChartPath:       current.ChartPath,
+			ChartVersion:    current.ChartVersion,
+			SourceRepoURL:   current.SourceRepoURL,
+			BuildPipelineID: current.BuildPipelineID,
+			DeployOrder:     &current.DeployOrder,
+			DefaultValues:   current.DefaultValues,
 		}
 
 		if chartPath != "" {
@@ -443,6 +465,9 @@ Examples:
 		if sourceRepoURL != "" {
 			req.SourceRepoURL = sourceRepoURL
 		}
+		if repositoryURL != "" {
+			req.RepositoryURL = repositoryURL
+		}
 		if deployOrder >= 0 {
 			req.DeployOrder = &deployOrder
 		}
@@ -539,6 +564,7 @@ func init() {
 	definitionUpdateChartCmd.Flags().String("chart-path", "", "Chart path (e.g. /charts/kvk-core)")
 	definitionUpdateChartCmd.Flags().String("chart-version", "", "Chart version")
 	definitionUpdateChartCmd.Flags().String("source-repo-url", "", "Git repository URL for branch listing")
+	definitionUpdateChartCmd.Flags().String("repository-url", "", "Helm chart repository URL (e.g. oci://acr.example.com/helm)")
 	definitionUpdateChartCmd.Flags().Int("deploy-order", -1, "Deploy order (0+)")
 	definitionUpdateChartCmd.Flags().String("file", "", "File containing default values")
 
diff --git a/cli/cmd/definition_test.go b/cli/cmd/definition_test.go
index cc701d7..9f21b95 100644
--- a/cli/cmd/definition_test.go
+++ b/cli/cmd/definition_test.go
@@ -1012,13 +1012,17 @@ func TestDefinitionUpdateCmd_NoFlags(t *testing.T) {
 
 func sampleChartConfig() types.ChartConfig {
 	return types.ChartConfig{
-		Base:          types.Base{ID: "1", Version: "1"},
-		Name:          "api",
-		RepoURL:       "https://charts.example.com",
-		ChartName:     "api-chart",
-		ChartVersion:  "2.0.0",
-		ReleaseName:   "api-release",
-		DefaultValues: "replicas: 1\nimage: app:latest",
+		Base:            types.Base{ID: "1", Version: "1"},
+		Name:            "api",
+		RepoURL:         "https://charts.example.com",
+		ChartName:       "api-chart",
+		ChartPath:       "/charts/api",
+		ChartVersion:    "2.0.0",
+		SourceRepoURL:   "https://dev.azure.com/org/project/_git/repo",
+		BuildPipelineID: "pipeline-42",
+		DeployOrder:     8,
+		ReleaseName:     "api-release",
+		DefaultValues:   "replicas: 1\nimage: app:latest",
 	}
 }
 
@@ -1040,6 +1044,15 @@ func TestDefinitionUpdateChartCmd_ChartVersion(t *testing.T) {
 		require.NoError(t, json.NewDecoder(r.Body).Decode(&body))
 		assert.Equal(t, "3.0.0", body.ChartVersion)
 		assert.Equal(t, chart.ChartName, body.ChartName)
+		// Fields not touched by the user flag must round-trip from the GET
+		// response back into the PUT body — that's the wipe-fix this PR exists for.
+		assert.Equal(t, chart.RepoURL, body.RepositoryURL)
+		assert.Equal(t, chart.ChartPath, body.ChartPath)
+		assert.Equal(t, chart.SourceRepoURL, body.SourceRepoURL)
+		assert.Equal(t, chart.BuildPipelineID, body.BuildPipelineID)
+		assert.Equal(t, chart.DefaultValues, body.DefaultValues)
+		require.NotNil(t, body.DeployOrder)
+		assert.Equal(t, chart.DeployOrder, *body.DeployOrder)
 
 		chart.ChartVersion = "3.0.0"
 		json.NewEncoder(w).Encode(chart)
@@ -1052,6 +1065,8 @@ func TestDefinitionUpdateChartCmd_ChartVersion(t *testing.T) {
 	t.Cleanup(func() {
 		definitionUpdateChartCmd.Flags().Set("chart-version", "")
 		definitionUpdateChartCmd.Flags().Set("chart-path", "")
+		definitionUpdateChartCmd.Flags().Set("source-repo-url", "")
+		definitionUpdateChartCmd.Flags().Set("repository-url", "")
 		definitionUpdateChartCmd.Flags().Set("deploy-order", "-1")
 		definitionUpdateChartCmd.Flags().Set("file", "")
 	})
@@ -1089,6 +1104,8 @@ func TestDefinitionUpdateChartCmd_ValuesFromFile(t *testing.T) {
 	t.Cleanup(func() {
 		definitionUpdateChartCmd.Flags().Set("chart-version", "")
 		definitionUpdateChartCmd.Flags().Set("chart-path", "")
+		definitionUpdateChartCmd.Flags().Set("source-repo-url", "")
+		definitionUpdateChartCmd.Flags().Set("repository-url", "")
 		definitionUpdateChartCmd.Flags().Set("deploy-order", "-1")
 		definitionUpdateChartCmd.Flags().Set("file", "")
 	})
@@ -1121,6 +1138,8 @@ func TestDefinitionUpdateChartCmd_DeployOrder(t *testing.T) {
 	t.Cleanup(func() {
 		definitionUpdateChartCmd.Flags().Set("chart-version", "")
 		definitionUpdateChartCmd.Flags().Set("chart-path", "")
+		definitionUpdateChartCmd.Flags().Set("source-repo-url", "")
+		definitionUpdateChartCmd.Flags().Set("repository-url", "")
 		definitionUpdateChartCmd.Flags().Set("deploy-order", "-1")
 		definitionUpdateChartCmd.Flags().Set("file", "")
 	})
@@ -1129,6 +1148,67 @@ func TestDefinitionUpdateChartCmd_DeployOrder(t *testing.T) {
 	require.NoError(t, err)
 }
 
+func TestDefinitionUpdateChartCmd_RepositoryURL(t *testing.T) {
+	chart := sampleChartConfig()
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		if r.Method == http.MethodGet {
+			json.NewEncoder(w).Encode(chart)
+			return
+		}
+		var body types.UpdateChartConfigRequest
+		require.NoError(t, json.NewDecoder(r.Body).Decode(&body))
+		assert.Equal(t, "oci://acr.example.com/helm", body.RepositoryURL)
+		// Other fields still seeded from GET.
+		assert.Equal(t, chart.ChartPath, body.ChartPath)
+		assert.Equal(t, chart.BuildPipelineID, body.BuildPipelineID)
+
+		chart.RepoURL = body.RepositoryURL
+		json.NewEncoder(w).Encode(chart)
+	}))
+	defer server.Close()
+
+	_ = setupStackTestCmd(t, server.URL)
+
+	definitionUpdateChartCmd.Flags().Set("repository-url", "oci://acr.example.com/helm")
+	t.Cleanup(func() {
+		definitionUpdateChartCmd.Flags().Set("chart-version", "")
+		definitionUpdateChartCmd.Flags().Set("chart-path", "")
+		definitionUpdateChartCmd.Flags().Set("source-repo-url", "")
+		definitionUpdateChartCmd.Flags().Set("repository-url", "")
+		definitionUpdateChartCmd.Flags().Set("deploy-order", "-1")
+		definitionUpdateChartCmd.Flags().Set("file", "")
+	})
+
+	err := definitionUpdateChartCmd.RunE(definitionUpdateChartCmd, []string{"5", "1"})
+	require.NoError(t, err)
+}
+
+func TestDefinitionUpdateChartCmd_RepositoryURL_Invalid(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		t.Fatal("API should not be called when --repository-url is invalid")
+	}))
+	defer server.Close()
+
+	_ = setupStackTestCmd(t, server.URL)
+
+	t.Cleanup(func() {
+		definitionUpdateChartCmd.Flags().Set("repository-url", "")
+	})
+
+	cases := []string{
+		"not-a-url",
+		"oci:/acr.example.com/helm",
+		"ftp://acr.example.com/helm",
+	}
+	for _, raw := range cases {
+		definitionUpdateChartCmd.Flags().Set("repository-url", raw)
+		err := definitionUpdateChartCmd.RunE(definitionUpdateChartCmd, []string{"5", "1"})
+		require.Error(t, err, raw)
+		assert.Contains(t, err.Error(), "--repository-url")
+	}
+}
+
 func TestDefinitionUpdateChartCmd_NoFlags(t *testing.T) {
 	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		t.Fatal("API should not be called when no flags provided")
@@ -1140,6 +1220,8 @@ func TestDefinitionUpdateChartCmd_NoFlags(t *testing.T) {
 	t.Cleanup(func() {
 		definitionUpdateChartCmd.Flags().Set("chart-version", "")
 		definitionUpdateChartCmd.Flags().Set("chart-path", "")
+		definitionUpdateChartCmd.Flags().Set("source-repo-url", "")
+		definitionUpdateChartCmd.Flags().Set("repository-url", "")
 		definitionUpdateChartCmd.Flags().Set("deploy-order", "-1")
 		definitionUpdateChartCmd.Flags().Set("file", "")
 	})
@@ -1169,6 +1251,8 @@ func TestDefinitionUpdateChartCmd_JSONOutput(t *testing.T) {
 	t.Cleanup(func() {
 		definitionUpdateChartCmd.Flags().Set("chart-version", "")
 		definitionUpdateChartCmd.Flags().Set("chart-path", "")
+		definitionUpdateChartCmd.Flags().Set("source-repo-url", "")
+		definitionUpdateChartCmd.Flags().Set("repository-url", "")
 		definitionUpdateChartCmd.Flags().Set("deploy-order", "-1")
 		definitionUpdateChartCmd.Flags().Set("file", "")
 	})
@@ -1200,6 +1284,8 @@ func TestDefinitionUpdateChartCmd_QuietOutput(t *testing.T) {
 	t.Cleanup(func() {
 		definitionUpdateChartCmd.Flags().Set("chart-version", "")
 		definitionUpdateChartCmd.Flags().Set("chart-path", "")
+		definitionUpdateChartCmd.Flags().Set("source-repo-url", "")
+		definitionUpdateChartCmd.Flags().Set("repository-url", "")
 		definitionUpdateChartCmd.Flags().Set("deploy-order", "-1")
 		definitionUpdateChartCmd.Flags().Set("file", "")
 	})
diff --git a/cli/pkg/types/types.go b/cli/pkg/types/types.go
index c1eead5..77f8d87 100644
--- a/cli/pkg/types/types.go
+++ b/cli/pkg/types/types.go
@@ -629,13 +629,21 @@ type UpdateDefinitionRequest struct {
 }
 
 // UpdateChartConfigRequest is the request body for PUT /api/v1/stack-definitions/:id/charts/:chartID.
+//
+// Includes every field the backend's ChartConfig knows about, so a
+// GET-then-PUT round-trip in update-chart doesn't silently wipe fields
+// stackctl flags don't expose. All string fields use omitempty, so an
+// empty value is dropped from the JSON body and the backend preserves
+// its existing value; there is no way to clear a field via this request.
 type UpdateChartConfigRequest struct {
-	ChartName     string `json:"chart_name,omitempty" yaml:"chart_name,omitempty"`
-	ChartPath     string `json:"chart_path,omitempty" yaml:"chart_path,omitempty"`
-	ChartVersion  string `json:"chart_version,omitempty" yaml:"chart_version,omitempty"`
-	SourceRepoURL string `json:"source_repo_url,omitempty" yaml:"source_repo_url,omitempty"`
-	DeployOrder   *int   `json:"deploy_order,omitempty" yaml:"deploy_order,omitempty"`
-	DefaultValues string `json:"default_values,omitempty" yaml:"default_values,omitempty"`
+	ChartName       string `json:"chart_name,omitempty" yaml:"chart_name,omitempty"`
+	RepositoryURL   string `json:"repository_url,omitempty" yaml:"repository_url,omitempty"`
+	ChartPath       string `json:"chart_path,omitempty" yaml:"chart_path,omitempty"`
+	ChartVersion    string `json:"chart_version,omitempty" yaml:"chart_version,omitempty"`
+	SourceRepoURL   string `json:"source_repo_url,omitempty" yaml:"source_repo_url,omitempty"`
+	BuildPipelineID string `json:"build_pipeline_id,omitempty" yaml:"build_pipeline_id,omitempty"`
+	DeployOrder     *int   `json:"deploy_order,omitempty" yaml:"deploy_order,omitempty"`
+	DefaultValues   string `json:"default_values,omitempty" yaml:"default_values,omitempty"`
 }
 
 // OrphanedNamespace represents a Kubernetes namespace with no matching stack record.