diff --git a/Makefile b/Makefile
index 7ee844f..3516730 100644
--- a/Makefile
+++ b/Makefile
@@ -18,7 +18,7 @@
 # Make will use bash instead of sh
 SHELL := /usr/bin/env bash
 
-DOCKER_TAG_VERSION_DEVELOPER_TOOLS := 1.4
+DOCKER_TAG_VERSION_DEVELOPER_TOOLS := 1.11
 DOCKER_IMAGE_DEVELOPER_TOOLS := cft/developer-tools
 REGISTRY_URL := gcr.io/cloud-foundation-cicd
 
diff --git a/README.md b/README.md
index 635e79f..adf7a70 100644
--- a/README.md
+++ b/README.md
@@ -48,7 +48,7 @@ Functional examples are included in the
 | encrypters | List of comma-separated owners for each key declared in set\_encrypters\_for. | `list(string)` | `[]` | no |
 | key\_algorithm | The algorithm to use when creating a version based on this template. See the https://cloud.google.com/kms/docs/reference/rest/v1/CryptoKeyVersionAlgorithm for possible inputs. | `string` | `"GOOGLE_SYMMETRIC_ENCRYPTION"` | no |
 | key\_protection\_level | The protection level to use when creating a version based on this template. Default value: "SOFTWARE" Possible values: ["SOFTWARE", "HSM"] | `string` | `"SOFTWARE"` | no |
-| key\_rotation\_period | n/a | `string` | `"100000s"` | no |
+| key\_rotation\_period | Generate a new key every time this period passes. | `string` | `"100000s"` | no |
 | keyring | Keyring name. | `string` | n/a | yes |
 | keys | Key names. | `list(string)` | `[]` | no |
 | labels | Labels, provided as a map | `map(string)` | `{}` | no |
diff --git a/build/int.cloudbuild.yaml b/build/int.cloudbuild.yaml
index 19bd76a..3e3bec9 100644
--- a/build/int.cloudbuild.yaml
+++ b/build/int.cloudbuild.yaml
@@ -37,4 +37,4 @@ tags:
 - 'integration'
 substitutions:
   _DOCKER_IMAGE_DEVELOPER_TOOLS: 'cft/developer-tools'
-  _DOCKER_TAG_VERSION_DEVELOPER_TOOLS: '1.4'
+  _DOCKER_TAG_VERSION_DEVELOPER_TOOLS: '1.11'
diff --git a/build/lint.cloudbuild.yaml b/build/lint.cloudbuild.yaml
index 7437fd5..e7ce466 100644
--- a/build/lint.cloudbuild.yaml
+++ b/build/lint.cloudbuild.yaml
@@ -21,4 +21,4 @@ tags:
 - 'lint'
 substitutions:
   _DOCKER_IMAGE_DEVELOPER_TOOLS: 'cft/developer-tools'
-  _DOCKER_TAG_VERSION_DEVELOPER_TOOLS: '1.4'
+  _DOCKER_TAG_VERSION_DEVELOPER_TOOLS: '1.11'
diff --git a/examples/simple_example/main.tf b/examples/simple_example/main.tf
index d5a44ec..1df2df8 100644
--- a/examples/simple_example/main.tf
+++ b/examples/simple_example/main.tf
@@ -18,7 +18,7 @@ module "kms" {
   source     = "../.."
   project_id = var.project_id
   keyring    = var.keyring
-  location   = "global"
+  location   = var.location
   keys       = var.keys
   # keys can be destroyed by Terraform
   prevent_destroy = false
diff --git a/test/fixtures/simple_example/main.tf b/test/fixtures/simple_example/main.tf
index 47f6a8b..6f3bc1f 100644
--- a/test/fixtures/simple_example/main.tf
+++ b/test/fixtures/simple_example/main.tf
@@ -14,10 +14,6 @@
  * limitations under the License.
  */
 
-provider "random" {
-  version = "~> 3.0"
-}
-
 resource "random_pet" "main" {
   length    = 1
   prefix    = "simple-example"
diff --git a/test/fixtures/simple_example/versions.tf b/test/fixtures/simple_example/versions.tf
new file mode 100644
index 0000000..9e88bde
--- /dev/null
+++ b/test/fixtures/simple_example/versions.tf
@@ -0,0 +1,25 @@
+/**
+ * Copyright 2023 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+terraform {
+  required_version = ">= 0.13"
+  required_providers {
+    random = {
+      source  = "hashicorp/random"
+      version = ">= 3.0"
+    }
+  }
+}
diff --git a/variables.tf b/variables.tf
index 038ea73..495c53e 100644
--- a/variables.tf
+++ b/variables.tf
@@ -38,6 +38,7 @@ variable "keys" {
 
 variable "prevent_destroy" {
   description = "Set the prevent_destroy lifecycle attribute on keys."
+  type        = bool
   default     = true
 }
 
@@ -84,8 +85,9 @@ variable "decrypters" {
 }
 
 variable "key_rotation_period" {
-  type    = string
-  default = "100000s"
+  description = "Generate a new key every time this period passes."
+  type        = string
+  default     = "100000s"
 }
 
 variable "key_algorithm" {