diff --git a/internal/app/apiserverapp/apiserverapp.go b/internal/app/apiserverapp/apiserverapp.go
index 055b6acd..6ba30741 100644
--- a/internal/app/apiserverapp/apiserverapp.go
+++ b/internal/app/apiserverapp/apiserverapp.go
@@ -150,6 +150,21 @@ func NewScheme() *runtime.Scheme {
 	utilruntime.Must(metav1.AddMetaToScheme(scheme))
 	utilruntime.Must(metainternalversion.AddToScheme(scheme))
 	utilruntime.Must(aggregationv1alpha1.AddToScheme(scheme))
+
+	// Register aggregation types for the internal hub version so the generic API
+	// server can convert SSA requests between v1alpha1 and __internal.
+	aggregationInternalGroupVersion := schema.GroupVersion{
+		Group:   aggregationv1alpha1.SchemeGroupVersion.Group,
+		Version: runtime.APIVersionInternal,
+	}
+	scheme.AddKnownTypes(
+		aggregationInternalGroupVersion,
+		&aggregationv1alpha1.CoderWorkspace{},
+		&aggregationv1alpha1.CoderWorkspaceList{},
+		&aggregationv1alpha1.CoderTemplate{},
+		&aggregationv1alpha1.CoderTemplateList{},
+	)
+
 	return scheme
 }
 
diff --git a/internal/app/apiserverapp/apiserverapp_test.go b/internal/app/apiserverapp/apiserverapp_test.go
index dae8cc33..d0083ab3 100644
--- a/internal/app/apiserverapp/apiserverapp_test.go
+++ b/internal/app/apiserverapp/apiserverapp_test.go
@@ -12,6 +12,7 @@ import (
 
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 	"k8s.io/apimachinery/pkg/runtime/serializer"
 	"k8s.io/apimachinery/pkg/util/managedfields"
@@ -31,11 +32,20 @@ func TestNewSchemeRegistersAggregationKinds(t *testing.T) {
 		t.Fatal("expected non-nil scheme")
 	}
 
+	aggregationInternalGroupVersion := schema.GroupVersion{
+		Group:   aggregationv1alpha1.SchemeGroupVersion.Group,
+		Version: runtime.APIVersionInternal,
+	}
+
 	for _, gvk := range []schema.GroupVersionKind{
 		aggregationv1alpha1.SchemeGroupVersion.WithKind("CoderWorkspace"),
 		aggregationv1alpha1.SchemeGroupVersion.WithKind("CoderWorkspaceList"),
 		aggregationv1alpha1.SchemeGroupVersion.WithKind("CoderTemplate"),
 		aggregationv1alpha1.SchemeGroupVersion.WithKind("CoderTemplateList"),
+		aggregationInternalGroupVersion.WithKind("CoderWorkspace"),
+		aggregationInternalGroupVersion.WithKind("CoderWorkspaceList"),
+		aggregationInternalGroupVersion.WithKind("CoderTemplate"),
+		aggregationInternalGroupVersion.WithKind("CoderTemplateList"),
 	} {
 		if !scheme.Recognizes(gvk) {
 			t.Fatalf("expected scheme to recognize %s", gvk.String())