diff --git a/.github/release-please.yml b/.github/release-please.yml
index 6366b9c..884357c 100644
--- a/.github/release-please.yml
+++ b/.github/release-please.yml
@@ -1,2 +1,16 @@
+# Copyright 2021 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.
+
 releaseType: terraform-module
 handleGHRelease: true
diff --git a/.github/workflows/stale.yml b/.github/workflows/stale.yml
index fcf18fe..de1fd4a 100644
--- a/.github/workflows/stale.yml
+++ b/.github/workflows/stale.yml
@@ -1,3 +1,17 @@
+# Copyright 2021 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.
+
 name: "Close stale issues"
 on:
   schedule:
diff --git a/.gitignore b/.gitignore
index 9ce300b..543ad6a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -43,3 +43,6 @@ crash.log
 **/*.tfvars
 
 credentials.json
+
+# tf lock file
+.terraform.lock.hcl
diff --git a/Makefile b/Makefile
index 6d34e48..5b71d3c 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 := 0.13
+DOCKER_TAG_VERSION_DEVELOPER_TOOLS := 1.0
 DOCKER_IMAGE_DEVELOPER_TOOLS := cft/developer-tools
 REGISTRY_URL := gcr.io/cloud-foundation-cicd
 
diff --git a/README.md b/README.md
index 252d03b..c776740 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,8 @@
 This module makes it easy to create Google Cloud Pub/Sub topic and subscriptions associated with the topic.
 
 ## Compatibility
-This module is meant for use with Terraform 0.13. If you haven't
+This module is meant for use with Terraform 0.13+ and tested using Terraform 1.0+. If you find incompatibilities using Terraform >=0.13, please open an issue.
+ If you haven't
 [upgraded](https://www.terraform.io/upgrade-guides/0-13.html) and need a Terraform
 0.12.x-compatible version of this module, the last released version
 intended for Terraform 0.12.x is [v1.9.0](https://registry.terraform.io/modules/terraform-google-modules/-pubsub/google/v1.9.0).
diff --git a/build/int.cloudbuild.yaml b/build/int.cloudbuild.yaml
index b3bf477..2fe9a02 100644
--- a/build/int.cloudbuild.yaml
+++ b/build/int.cloudbuild.yaml
@@ -38,4 +38,4 @@ tags:
 - 'integration'
 substitutions:
   _DOCKER_IMAGE_DEVELOPER_TOOLS: 'cft/developer-tools'
-  _DOCKER_TAG_VERSION_DEVELOPER_TOOLS: '0.13'
+  _DOCKER_TAG_VERSION_DEVELOPER_TOOLS: '1.0'
diff --git a/build/lint.cloudbuild.yaml b/build/lint.cloudbuild.yaml
index 8ef5f4c..b593c0c 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: '0.13'
+  _DOCKER_TAG_VERSION_DEVELOPER_TOOLS: '1.0'