diff --git a/controllers/hcloudmachinetemplate_controller_test.go b/controllers/hcloudmachinetemplate_controller_test.go
index 9bda55d1c..e897498a1 100644
--- a/controllers/hcloudmachinetemplate_controller_test.go
+++ b/controllers/hcloudmachinetemplate_controller_test.go
@@ -289,10 +289,21 @@ var _ = Describe("HCloudMachineTemplateReconciler", func() {
 			It("should prevent updating Image name", func() {
 				Expect(testEnv.Get(ctx, key, machineTemplate)).To(Succeed())
 
-				hcloudMachineTemplate.Spec.Template.Spec.Type = "cpx32"
+				hcloudMachineTemplate.Spec.Template.Spec.ImageName = "fedora-control-plane"
+				Expect(testEnv.Client.Update(ctx, hcloudMachineTemplate)).ToNot(Succeed())
+
+			})
+			It("should prevent updating SSHKey", func() {
+				Expect(testEnv.Get(ctx, key, machineTemplate)).To(Succeed())
+
+				hcloudMachineTemplate.Spec.Template.Spec.SSHKeys = []infrav1.SSHKey{{Name: "ssh-key-1"}}
 				Expect(testEnv.Client.Update(ctx, hcloudMachineTemplate)).ToNot(Succeed())
 
-				hcloudMachineTemplate.Spec.Template.Spec.ImageName = "fedor-control-plane"
+			})
+			It("should prevent updating PlacementGroups", func() {
+				Expect(testEnv.Get(ctx, key, machineTemplate)).To(Succeed())
+
+				hcloudMachineTemplate.Spec.Template.Spec.PlacementGroupName = createPlacementGroupName("placement-group-1")
 				Expect(testEnv.Client.Update(ctx, hcloudMachineTemplate)).ToNot(Succeed())
 
 			})
@@ -314,3 +325,7 @@ var _ = Describe("HCloudMachineTemplateReconciler", func() {
 
 	})
 })
+
+func createPlacementGroupName(name string) *string {
+	return &name
+}