diff --git a/client.go b/client.go
index 7d5e0aa..8ad19de 100644
--- a/client.go
+++ b/client.go
@@ -16,7 +16,7 @@ import (
 	"time"
 )
 
-const Version = "0.4.0"
+const Version = "0.5.0"
 
 type Logger interface {
 	Printf(format string, args ...any)
diff --git a/client_test.go b/client_test.go
index cb82bab..6789e4f 100644
--- a/client_test.go
+++ b/client_test.go
@@ -190,6 +190,23 @@ func TestInstanceChangePricingAndAsyncTraffic(t *testing.T) {
 	}
 }
 
+func TestExpandRootVolumePathAndBody(t *testing.T) {
+	client, _ := testClient(t, func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodPatch || r.URL.Path != "/api/sdk/v1/regions/us-east-1/instances/local-1/root-volume" {
+			t.Fatalf("unexpected request %s %s", r.Method, r.URL.Path)
+		}
+		var body ExpandRootVolumeRequest
+		if err := json.NewDecoder(r.Body).Decode(&body); err != nil || body.SizeGiB != 80 || body.ExpectedConfigurationFingerprint != "fp" {
+			t.Fatalf("unexpected body %#v err=%v", body, err)
+		}
+		_, _ = w.Write([]byte(`{"code":202,"message":"Accepted","data":{"task_id":"task-root","status":"queued"}}`))
+	})
+	operation, err := client.Volumes.ExpandRoot(context.Background(), "us-east-1", "local-1", ExpandRootVolumeRequest{SizeGiB: 80, ExpectedConfigurationFingerprint: "fp"}, WithIdempotencyKey("root-expand"))
+	if err != nil || operation.TaskID != "task-root" {
+		t.Fatalf("operation=%#v err=%v", operation, err)
+	}
+}
+
 func TestInstanceDetailsExposeCatalogMetadata(t *testing.T) {
 	client, _ := testClient(t, func(w http.ResponseWriter, r *http.Request) {
 		w.Header().Set("Content-Type", "application/json")
diff --git a/resources.go b/resources.go
index 8de5584..c7f65e3 100644
--- a/resources.go
+++ b/resources.go
@@ -86,6 +86,10 @@ type ModifyVolumeRequest struct {
 	Throughput                       int32  `json:"throughput,omitempty"`
 	ExpectedConfigurationFingerprint string `json:"expected_configuration_fingerprint,omitempty"`
 }
+type ExpandRootVolumeRequest struct {
+	SizeGiB                          int32  `json:"size_gib"`
+	ExpectedConfigurationFingerprint string `json:"expected_configuration_fingerprint,omitempty"`
+}
 
 func (s *VolumeService) List(ctx context.Context, region, instanceID string) ([]Volume, error) {
 	var result struct {
@@ -106,6 +110,9 @@ func (s *VolumeService) Detach(ctx context.Context, region, instanceID, volumeID
 func (s *VolumeService) Modify(ctx context.Context, region, instanceID, volumeID string, input ModifyVolumeRequest, options ...RequestOption) (*Operation, error) {
 	return (&InstancesService{client: s.client}).operation(ctx, http.MethodPatch, instancesPath(region, instanceID)+"/volumes/"+escaped(volumeID), input, options...)
 }
+func (s *VolumeService) ExpandRoot(ctx context.Context, region, instanceID string, input ExpandRootVolumeRequest, options ...RequestOption) (*Operation, error) {
+	return (&InstancesService{client: s.client}).operation(ctx, http.MethodPatch, instancesPath(region, instanceID)+"/root-volume", input, options...)
+}
 func (s *VolumeService) Delete(ctx context.Context, region, instanceID, volumeID string, force bool, options ...RequestOption) (*Operation, error) {
 	return (&InstancesService{client: s.client}).operation(ctx, http.MethodDelete, instancesPath(region, instanceID)+"/volumes/"+escaped(volumeID), map[string]bool{"force": force}, options...)
 }
diff --git a/types.go b/types.go
index 691fbec..61f2eb7 100644
--- a/types.go
+++ b/types.go
@@ -164,12 +164,13 @@ type PriceEstimate struct {
 }
 
 const (
-	InstanceChangeEIPAdd       = "eip_add"
-	InstanceChangeEIPReplace   = "eip_replace"
-	InstanceChangeVolumeCreate = "volume_create"
-	InstanceChangeVolumeExpand = "volume_expand"
-	InstanceChangeRebuildImage = "rebuild_image"
-	InstanceChangeTrafficLimit = "traffic_limit"
+	InstanceChangeEIPAdd           = "eip_add"
+	InstanceChangeEIPReplace       = "eip_replace"
+	InstanceChangeVolumeCreate     = "volume_create"
+	InstanceChangeVolumeExpand     = "volume_expand"
+	InstanceChangeRootVolumeExpand = "root_volume_expand"
+	InstanceChangeRebuildImage     = "rebuild_image"
+	InstanceChangeTrafficLimit     = "traffic_limit"
 )
 
 type InstanceChangePriceRequest struct {