diff --git a/google/resource_cloudbuild_build_trigger.go b/google/resource_cloudbuild_build_trigger.go
index 8009a687e0c..7b5daf704bd 100644
--- a/google/resource_cloudbuild_build_trigger.go
+++ b/google/resource_cloudbuild_build_trigger.go
@@ -17,6 +17,7 @@ func resourceCloudBuildTrigger() *schema.Resource {
 	return &schema.Resource{
 		Create: resourceCloudbuildBuildTriggerCreate,
 		Read:   resourceCloudbuildBuildTriggerRead,
+		Update: resourceCloudbuildBuildTriggerUpdate,
 		Delete: resourceCloudbuildBuildTriggerDelete,
 		Importer: &schema.ResourceImporter{
 			State: resourceCloudBuildTriggerImportState,
@@ -39,38 +40,32 @@ func resourceCloudBuildTrigger() *schema.Resource {
 			"filename": &schema.Schema{
 				Type:          schema.TypeString,
 				Optional:      true,
-				ForceNew:      true,
 				ConflictsWith: []string{"build"},
 			},
 			"build": {
 				Type:        schema.TypeList,
 				Description: "Contents of the build template.",
 				Optional:    true,
-				ForceNew:    true,
 				MaxItems:    1,
 				Elem: &schema.Resource{
 					Schema: map[string]*schema.Schema{
 						"images": &schema.Schema{
 							Type:     schema.TypeList,
 							Optional: true,
-							ForceNew: true,
 							Elem:     &schema.Schema{Type: schema.TypeString},
 						},
 						"step": &schema.Schema{
 							Type:     schema.TypeList,
 							Optional: true,
-							ForceNew: true,
 							Elem: &schema.Resource{
 								Schema: map[string]*schema.Schema{
 									"name": &schema.Schema{
 										Type:     schema.TypeString,
 										Optional: true,
-										ForceNew: true,
 									},
 									"args": &schema.Schema{
 										Type:     schema.TypeString,
 										Optional: true,
-										ForceNew: true,
 									},
 								},
 							},
@@ -78,7 +73,6 @@ func resourceCloudBuildTrigger() *schema.Resource {
 						"tags": &schema.Schema{
 							Type:     schema.TypeList,
 							Optional: true,
-							ForceNew: true,
 							Elem:     &schema.Schema{Type: schema.TypeString},
 						},
 					},
@@ -87,50 +81,41 @@ func resourceCloudBuildTrigger() *schema.Resource {
 			"description": &schema.Schema{
 				Type:     schema.TypeString,
 				Optional: true,
-				ForceNew: true,
 			},
 			"substitutions": &schema.Schema{
 				Optional: true,
 				Type:     schema.TypeMap,
-				ForceNew: true,
 				Elem:     &schema.Schema{Type: schema.TypeString},
 			},
 			"trigger_template": &schema.Schema{
 				Optional: true,
 				Type:     schema.TypeList,
 				MaxItems: 1,
-				ForceNew: true,
 				Elem: &schema.Resource{
 					Schema: map[string]*schema.Schema{
 						"branch_name": &schema.Schema{
 							Type:     schema.TypeString,
 							Optional: true,
-							ForceNew: true,
 						},
 						"commit_sha": &schema.Schema{
 							Type:     schema.TypeString,
 							Optional: true,
-							ForceNew: true,
 						},
 						"dir": &schema.Schema{
 							Type:     schema.TypeString,
 							Optional: true,
-							ForceNew: true,
 						},
 						"project": &schema.Schema{
 							Type:     schema.TypeString,
 							Optional: true,
-							ForceNew: true,
 						},
 						"repo_name": &schema.Schema{
 							Type:     schema.TypeString,
 							Optional: true,
-							ForceNew: true,
 						},
 						"tag_name": &schema.Schema{
 							Type:     schema.TypeString,
 							Optional: true,
-							ForceNew: true,
 						},
 					},
 				},
@@ -147,22 +132,11 @@ func resourceCloudbuildBuildTriggerCreate(d *schema.ResourceData, meta interface
 		return err
 	}
 
-	// Build the address parameter
-	buildTrigger := &cloudbuild.BuildTrigger{}
-
-	if v, ok := d.GetOk("description"); ok {
-		buildTrigger.Description = v.(string)
-	}
-
-	if v, ok := d.GetOk("filename"); ok {
-		buildTrigger.Filename = v.(string)
-	} else {
-		buildTrigger.Build = expandCloudbuildBuildTriggerBuild(d)
+	buildTrigger, err := expandCloudbuildBuildTrigger(d, meta)
+	if err != nil {
+		return err
 	}
 
-	buildTrigger.TriggerTemplate = expandCloudbuildBuildTriggerTemplate(d, project)
-	buildTrigger.Substitutions = expandStringMap(d, "substitutions")
-
 	tstr, err := json.Marshal(buildTrigger)
 	if err != nil {
 		return err
@@ -208,6 +182,56 @@ func resourceCloudbuildBuildTriggerRead(d *schema.ResourceData, meta interface{}
 	return nil
 }
 
+func resourceCloudbuildBuildTriggerUpdate(d *schema.ResourceData, meta interface{}) error {
+	config := meta.(*Config)
+
+	project, err := getProject(d, config)
+	if err != nil {
+		return err
+	}
+
+	buildTrigger, err := expandCloudbuildBuildTrigger(d, meta)
+	if err != nil {
+		return err
+	}
+
+	id := d.Id()
+
+	log.Printf("[INFO] Updating Cloud Build Trigger: %s", id)
+
+	if _, err = config.clientBuild.Projects.Triggers.Patch(project, id, buildTrigger).Do(); err != nil {
+		return err
+	}
+
+	return resourceCloudbuildBuildTriggerRead(d, meta)
+}
+
+func expandCloudbuildBuildTrigger(d *schema.ResourceData, meta interface{}) (*cloudbuild.BuildTrigger, error) {
+	config := meta.(*Config)
+
+	project, err := getProject(d, config)
+	if err != nil {
+		return nil, err
+	}
+
+	t := &cloudbuild.BuildTrigger{}
+
+	if v, ok := d.GetOk("description"); ok {
+		t.Description = v.(string)
+	}
+
+	if v, ok := d.GetOk("filename"); ok {
+		t.Filename = v.(string)
+	} else {
+		t.Build = expandCloudbuildBuildTriggerBuild(d)
+	}
+
+	t.Substitutions = expandStringMap(d, "substitutions")
+	t.TriggerTemplate = expandCloudbuildBuildTriggerTemplate(d, project)
+
+	return t, nil
+}
+
 func expandCloudbuildBuildTriggerTemplate(d *schema.ResourceData, project string) *cloudbuild.RepoSource {
 	if d.Get("trigger_template.#").(int) == 0 {
 		return nil
diff --git a/google/resource_cloudbuild_build_trigger_test.go b/google/resource_cloudbuild_build_trigger_test.go
index bc36c2a4c24..2489a8d4be0 100644
--- a/google/resource_cloudbuild_build_trigger_test.go
+++ b/google/resource_cloudbuild_build_trigger_test.go
@@ -34,6 +34,15 @@ func TestAccCloudBuildTrigger_basic(t *testing.T) {
 				ImportStateVerify:   true,
 				ImportStateIdPrefix: fmt.Sprintf("%s/", projectID),
 			},
+			resource.TestStep{
+				Config: testGoogleCloudBuildTrigger_updated(projectID, projectOrg, projectBillingAccount),
+			},
+			resource.TestStep{
+				ResourceName:        "google_cloudbuild_trigger.build_trigger",
+				ImportState:         true,
+				ImportStateVerify:   true,
+				ImportStateIdPrefix: fmt.Sprintf("%s/", projectID),
+			},
 			resource.TestStep{
 				Config: testGoogleCloudBuildTrigger_removed(projectID, projectOrg, projectBillingAccount),
 				Check: resource.ComposeTestCheckFunc(
@@ -210,6 +219,59 @@ resource "google_cloudbuild_trigger" "build_trigger" {
   `, projectID, projectID, projectOrg, projectBillingAccount)
 }
 
+func testGoogleCloudBuildTrigger_updated(projectID, projectOrg, projectBillingAccount string) string {
+	return fmt.Sprintf(`
+resource "google_project" "acceptance" {
+  name            = "%s"
+  project_id      = "%s"
+  org_id          = "%s"
+  billing_account = "%s"
+}
+
+resource "google_project_services" "acceptance" {
+  project = "${google_project.acceptance.project_id}"
+
+  services = [
+    "cloudbuild.googleapis.com",
+    "containerregistry.googleapis.com",
+    "logging.googleapis.com",
+    "pubsub.googleapis.com",
+    "storage-api.googleapis.com",
+  ]
+}
+
+resource "google_cloudbuild_trigger" "build_trigger" {
+  project = "${google_project_services.acceptance.project}"
+  description = "acceptance test build trigger updated"
+  trigger_template {
+    branch_name = "master-updated"
+    project     = "${google_project_services.acceptance.project}"
+    repo_name   = "some-repo-updated"
+  }
+  build {
+    images = ["gcr.io/$PROJECT_ID/$REPO_NAME:$SHORT_SHA"]
+    tags = ["team-a", "service-b", "updated"]
+    step {
+      name = "gcr.io/cloud-builders/gsutil"
+      args = "cp gs://mybucket/remotefile.zip localfile-updated.zip "
+    }
+    step {
+      name = "gcr.io/cloud-builders/go"
+      args = "build my_package_updated"
+    }
+    step {
+      name = "gcr.io/cloud-builders/docker"
+      args = "build -t gcr.io/$PROJECT_ID/$REPO_NAME:$SHORT_SHA -f Dockerfile ."
+    }
+    step {
+      name = "gcr.io/$PROJECT_ID/$REPO_NAME:$SHORT_SHA"
+      args = "test"
+    }
+  }
+}
+  `, projectID, projectID, projectOrg, projectBillingAccount)
+}
+
 func testGoogleCloudBuildTrigger_filename(projectID, projectOrg, projectBillingAccount string) string {
 	return fmt.Sprintf(`
 resource "google_project" "acceptance" {