diff --git a/templates/inspec/tests/integration/build/gcp-mm.tf b/templates/inspec/tests/integration/build/gcp-mm.tf
index 94b6f721962e..c150ab5884c7 100644
--- a/templates/inspec/tests/integration/build/gcp-mm.tf
+++ b/templates/inspec/tests/integration/build/gcp-mm.tf
@@ -612,7 +612,7 @@ resource "google_cloudfunctions_function" "function" {
   trigger_http          = "${var.cloudfunction["trigger_http"]}"
   timeout               = "${var.cloudfunction["timeout"]}"
   entry_point           = "${var.cloudfunction["entry_point"]}"
-  runtime               = "nodejs6"
+  runtime               = "nodejs8"
 
   environment_variables = {
     MY_ENV_VAR = "${var.cloudfunction["env_var_value"]}"
diff --git a/third_party/terraform/resources/resource_cloudfunctions_function.go b/third_party/terraform/resources/resource_cloudfunctions_function.go
index 236a4068c78b..3f062282ebc2 100644
--- a/third_party/terraform/resources/resource_cloudfunctions_function.go
+++ b/third_party/terraform/resources/resource_cloudfunctions_function.go
@@ -187,9 +187,8 @@ func resourceCloudFunctionsFunction() *schema.Resource {
 			},
 
 			"runtime": {
-				Type:     schema.TypeString,
-				Optional: true,
-				Default:  "nodejs6",
+				Type:         schema.TypeString,
+				Required:     true,
 			},
 
 			"service_account_email": {
diff --git a/third_party/terraform/tests/resource_cloudfunctions_function_test.go.erb b/third_party/terraform/tests/resource_cloudfunctions_function_test.go.erb
index d0f56257e49e..ec9cf4dbcd04 100644
--- a/third_party/terraform/tests/resource_cloudfunctions_function_test.go.erb
+++ b/third_party/terraform/tests/resource_cloudfunctions_function_test.go.erb
@@ -524,6 +524,7 @@ resource "google_storage_bucket_object" "archive" {
 
 resource "google_cloudfunctions_function" "function" {
   name                  = "%s"
+  runtime               = "nodejs8"
   description           = "test function"
   available_memory_mb   = 128
   source_archive_bucket = "${google_storage_bucket.bucket.name}"
@@ -628,7 +629,7 @@ resource "google_storage_bucket_object" "archive" {
 
 resource "google_cloudfunctions_function" "function" {
   name                  = "%s"
-  runtime               = "nodejs6"
+  runtime               = "nodejs8"
   available_memory_mb   = 128
   source_archive_bucket = "${google_storage_bucket.bucket.name}"
   source_archive_object = "${google_storage_bucket_object.archive.name}"
@@ -659,6 +660,7 @@ resource "google_storage_bucket_object" "archive" {
 
 resource "google_cloudfunctions_function" "function" {
   name                  = "%s"
+  runtime               = "nodejs8"
   available_memory_mb   = 128
   source_archive_bucket = "${google_storage_bucket.bucket.name}"
   source_archive_object = "${google_storage_bucket_object.archive.name}"
@@ -686,6 +688,7 @@ resource "google_storage_bucket_object" "archive" {
 
 resource "google_cloudfunctions_function" "function" {
   name                  = "%s"
+  runtime               = "nodejs8"
   available_memory_mb   = 128
   source_archive_bucket = "${google_storage_bucket.bucket.name}"
   source_archive_object = "${google_storage_bucket_object.archive.name}"
@@ -702,6 +705,7 @@ func testAccCloudFunctionsFunction_sourceRepo(functionName, project string) stri
 	return fmt.Sprintf(`
 resource "google_cloudfunctions_function" "function" {
   name = "%s"
+  runtime = "nodejs8"
 
   source_repository {
     // There isn't yet an API that'll allow us to create a source repository and
@@ -733,6 +737,7 @@ data "google_compute_default_service_account" "default" { }
 
 resource "google_cloudfunctions_function" "function" {
   name = "%s"
+  runtime = "nodejs8"
 
   source_archive_bucket = "${google_storage_bucket.bucket.name}"
   source_archive_object = "${google_storage_bucket_object.archive.name}"
@@ -778,6 +783,7 @@ resource "google_storage_bucket_object" "archive" {
 
 resource "google_cloudfunctions_function" "function" {
   name     = "%s"
+  runtime  = "nodejs8"
   provider = "google-beta"
 
   description           = "test function"
diff --git a/third_party/terraform/website/docs/guides/version_3_upgrade.html.markdown b/third_party/terraform/website/docs/guides/version_3_upgrade.html.markdown
index b873e36c277d..d14cb8d1d52d 100644
--- a/third_party/terraform/website/docs/guides/version_3_upgrade.html.markdown
+++ b/third_party/terraform/website/docs/guides/version_3_upgrade.html.markdown
@@ -54,6 +54,7 @@ so Terraform knows to manage them.
 - [Provider Version Configuration](#provider-version-configuration)
 - [Data Source: `google_container_engine_versions`](#data-source-google_container_engine_versions)
 - [Resource: `google_container_cluster`](#resource-google_container_cluster)
+- [Resource: `google_cloudfunctions_function`](#resource-google_cloudfunctions_function)
 - [Resource: `google_cloudiot_registry`](#resource-google_cloudiot_registry)
 - [Resource: `google_compute_forwarding_rule`](#resource-google_compute_forwarding_rule)
 - [Resource: `google_compute_network`](#resource-google_compute_network)
@@ -257,6 +258,13 @@ introducing an incompatibility for users who specify config in JSON instead of
 HCL or who use `dynamic` blocks. See more details in the [Attributes as Blocks](https://www.terraform.io/docs/configuration/attr-as-blocks.html)
 documentation.
 
+## Resource: `google_cloudfunctions_function`
+
+### The `runtime` option `nodejs6` has been deprecated
+
+`nodejs6` has been deprecated and is no longer the default value for `runtime`.
+`runtime` is now required.
+
 ## Resource: `google_cloudiot_registry`
 
 ### `event_notification_config` is now removed
diff --git a/third_party/terraform/website/docs/r/cloudfunctions_function.html.markdown b/third_party/terraform/website/docs/r/cloudfunctions_function.html.markdown
index ffec17d642b0..b7681f5e5ea5 100644
--- a/third_party/terraform/website/docs/r/cloudfunctions_function.html.markdown
+++ b/third_party/terraform/website/docs/r/cloudfunctions_function.html.markdown
@@ -106,10 +106,8 @@ The following arguments are supported:
 
 * `name` - (Required) A user-defined name of the function. Function names must be unique globally.
 
-* `runtime` - (Optional) The runtime in which the function is going to run. One
-of `"nodejs6"`, `"nodejs8"`, `"nodejs10"`, `"python37"`, `"go111"`. If empty,
-defaults to `"nodejs6"`. It's recommended that you override the default, as
-`"nodejs6"` is deprecated.
+* `runtime` - (Required) The runtime in which the function is going to run.
+Eg. `"nodejs8"`, `"nodejs10"`, `"python37"`, `"go111"`.
 
 - - -