diff --git a/.release-notes/add-ghcr-io-support.md b/.release-notes/add-ghcr-io-support.md
new file mode 100644
index 0000000..260e9a2
--- /dev/null
+++ b/.release-notes/add-ghcr-io-support.md
@@ -0,0 +1,9 @@
+## Add support for GHCR.io
+
+We've added support for an additional registry to our two commands that were registry specific.
+
+`update-action-to-use-docker-image-to-run-action` now takes an environment variable `REGISTRY` to indicate which registry to use.
+
+`update-version-in-README` now support changing docker urls for both the default (none) and for urls targeting `ghcr.io`.
+
+See the README for updated usage instructions for `update-action-to-use-docker-image-to-run-action`. You don't need to make any changes for related to the `update-version-in-README` change.
diff --git a/README.md b/README.md
index 4aa1520..ba6489a 100644
--- a/README.md
+++ b/README.md
@@ -530,7 +530,20 @@ An example step config:
           GIT_USER_EMAIL: "ponylang.main@gmail.com"
 ```
 
-N.B. currently limited to supporting images that are uploaded to Docker Hub.
+To use a registry other than DockerHub, add the registry in the REGISTRY environment variable. For example to use GitHub Container Registry:
+
+```yml
+      - name: Set action to run using prebuilt image
+        uses: ponylang/release-bot-action@0.6.1
+        with:
+          entrypoint: update-action-to-use-docker-image-to-run-action
+        env:
+          GIT_USER_NAME: "Ponylang Main Bot"
+          GIT_USER_EMAIL: "ponylang.main@gmail.com"
+          REGISTRY: "ghcr.io"
+```
+
+Current valid entries for `REGISTRY` are '', 'docker.io', and 'ghcr.io'.
 
 ### update-action-to-use-dockerfile-to-run-action
 
@@ -604,6 +617,7 @@ Can update the following version patterns:
 - corral add github.com/REPO.git --version \d+\.\d+\.\d+
 - REPO@\d+\.\d+\.\d+ <== standard action url
 - docker://REPO:\d+\.\d+\.\d+ <== docker hub url
+- docker://ghcr.io/REPO:\d+\.\d+\.\d+ <== github container registry url
 
 - **Must** be triggered by an `announce-X.Y.Z` tag push.
 - **Must** be run in a job after `actions/checkout`
diff --git a/scripts/update-action-to-use-docker-image-to-run-action b/scripts/update-action-to-use-docker-image-to-run-action
index 4d4fb25..bfd7ac3 100644
--- a/scripts/update-action-to-use-docker-image-to-run-action
+++ b/scripts/update-action-to-use-docker-image-to-run-action
@@ -59,11 +59,27 @@ git.config('--global', 'user.email', os.environ['GIT_USER_EMAIL'])
 git.config('--global', 'branch.autosetuprebase', 'always')
 git.config('--global', '--add', 'safe.directory', os.environ['GITHUB_WORKSPACE'])
 
-# open README and update with new version
+# open action.yml and update with new version. using the denoted registry if
+# one is given
+registry = ''
+
+if 'REGISTRY' in os.environ:
+    registry = os.environ['REGISTRY']
+    match registry:
+        case '':
+            registry = registry
+        case 'docker.io':
+            registry = registry + '/'
+        case 'ghcr.io':
+            registry = registry + '/'
+        case _:
+            print(ERROR + registry + " isn't a supported REGISTRY. Exiting." + ENDC)
+            sys.exit(1)
+
 print(INFO + "Switching to prebuilt image as runner in action.yml" + ENDC)
 with open('action.yml', 'r+') as action_yml:
     text = yaml.safe_load(action_yml)
-    text['runs']['image'] = f'docker://{repository}:{version}'
+    text['runs']['image'] = f'docker://{registry}{repository}:{version}'
     action_yml.seek(0)
     yaml.dump(text, action_yml)
     action_yml.truncate()
diff --git a/scripts/update-version-in-README b/scripts/update-version-in-README
index d77b118..7ef9942 100644
--- a/scripts/update-version-in-README
+++ b/scripts/update-version-in-README
@@ -57,6 +57,8 @@ git.config('--global', '--add', 'safe.directory', os.environ['GITHUB_WORKSPACE']
 subs = [
     (fr'docker://{repository}:\d+\.\d+\.\d+',
      f'docker://{repository}:{version}'),
+    (fr'docker://ghcr.io/{repository}:\d+\.\d+\.\d+',
+     f'docker://ghcr.io/{repository}:{version}'),
     (fr'{repository}@\d+\.\d+\.\d+',
      f'{repository}@{version}'),
     (fr'corral add github.com/{repository}.git -(-version|v) \d+\.\d+\.\d+',