diff --git a/.dockerfiles/latest/x86-64-pc-windows-msvc/build-and-push.ps1 b/.dockerfiles/latest/x86-64-pc-windows-msvc/build-and-push.ps1
index f94bf00a8e..012de59b86 100644
--- a/.dockerfiles/latest/x86-64-pc-windows-msvc/build-and-push.ps1
+++ b/.dockerfiles/latest/x86-64-pc-windows-msvc/build-and-push.ps1
@@ -1,7 +1,15 @@
-# You should already be logged in to DockerHub when you run this.
+# You should already be logged in to DockerHub and GitHub Container Registry
+# when you run this.
 $ErrorActionPreference = 'Stop'
 
 $dockerfileDir = Split-Path $script:MyInvocation.MyCommand.Path
 
+## DockerHub
+
 docker build --pull -t "ponylang/ponyc:windows" $dockerfileDir
 docker push "ponylang/ponyc:windows"
+
+## GitHub Container Registry
+
+docker build --pull -t "ghcr.io/ponylang/ponyc:windows" $dockerfileDir
+docker push "ghcr.io/ponylang/ponyc:windows"
diff --git a/.dockerfiles/latest/x86-64-unknown-linux-gnu/build-and-push.bash b/.dockerfiles/latest/x86-64-unknown-linux-gnu/build-and-push.bash
index 5226ed960c..c42c80c274 100644
--- a/.dockerfiles/latest/x86-64-unknown-linux-gnu/build-and-push.bash
+++ b/.dockerfiles/latest/x86-64-unknown-linux-gnu/build-and-push.bash
@@ -4,10 +4,18 @@ set -o errexit
 set -o nounset
 
 #
-# *** You should already be logged in to DockerHub when you run this ***
+# *** You should already be logged in to DockerHub
+# and GitHub Container Registery when you run this ***
 #
 
 DOCKERFILE_DIR="$(dirname "$0")"
 
+## DockerHub
+
 docker build --pull -t "ponylang/ponyc:latest" "${DOCKERFILE_DIR}"
 docker push "ponylang/ponyc:latest"
+
+## GitHub Container Registry
+
+docker build --pull -t "ghcr.io/ponylang/ponyc:latest" "${DOCKERFILE_DIR}"
+docker push "ghcr.io/ponylang/ponyc:latest"
diff --git a/.dockerfiles/latest/x86-64-unknown-linux-musl/build-and-push.bash b/.dockerfiles/latest/x86-64-unknown-linux-musl/build-and-push.bash
index 0f55b05a39..64a42f1c6f 100644
--- a/.dockerfiles/latest/x86-64-unknown-linux-musl/build-and-push.bash
+++ b/.dockerfiles/latest/x86-64-unknown-linux-musl/build-and-push.bash
@@ -4,10 +4,18 @@ set -o errexit
 set -o nounset
 
 #
-# *** You should already be logged in to DockerHub when you run this ***
+# *** You should already be logged in to DockerHub
+# and GitHub Container Registery when you run this ***
 #
 
 DOCKERFILE_DIR="$(dirname "$0")"
 
+## DockerHub
+
 docker build --pull -t "ponylang/ponyc:alpine" "${DOCKERFILE_DIR}"
 docker push "ponylang/ponyc:alpine"
+
+## GitHub Container Registry
+
+docker build --pull -t "ghcr.io/ponylang/ponyc:alpine" "${DOCKERFILE_DIR}"
+docker push "ghcr.io/ponylang/ponyc:alpine"
diff --git a/.dockerfiles/release/x86-64-pc-windows-msvc/build-and-push.ps1 b/.dockerfiles/release/x86-64-pc-windows-msvc/build-and-push.ps1
index 6522b47070..b227351bf5 100644
--- a/.dockerfiles/release/x86-64-pc-windows-msvc/build-and-push.ps1
+++ b/.dockerfiles/release/x86-64-pc-windows-msvc/build-and-push.ps1
@@ -1,4 +1,5 @@
-# You should already be logged in to DockerHub when you run this.
+# You should already be logged in to DockerHub and GitHub Container Registry
+# when you run this.
 $ErrorActionPreference = 'Stop'
 
 if ([string]::IsNullOrWhitespace($env:VERSION))
@@ -13,6 +14,8 @@ if ([string]::IsNullOrWhitespace($env:GITHUB_REPOSITORY))
 
 $dockerfileDir = Split-Path $script:MyInvocation.MyCommand.Path
 
+## DockerHub
+
 $dockerTag = $env:GITHUB_REPOSITORY + ':' + $env:VERSION + '-windows'
 docker build --pull -t "$dockerTag" "$dockerfileDir"
 docker push "$dockerTag"
@@ -20,3 +23,13 @@ docker push "$dockerTag"
 $dockerTag = $env:GITHUB_REPOSITORY + ':release-windows'
 docker build --pull -t "$dockerTag" "$dockerfileDir"
 docker push "$dockerTag"
+
+## GitHub Container Registry
+
+$dockerTag = "ghcr.io/" + $env:GITHUB_REPOSITORY + ':' + $env:VERSION + '-windows'
+docker build --pull -t "$dockerTag" "$dockerfileDir"
+docker push "$dockerTag"
+
+$dockerTag = "ghcr.io" + $env:GITHUB_REPOSITORY + ':release-windows'
+docker build --pull -t "$dockerTag" "$dockerfileDir"
+docker push "$dockerTag"
diff --git a/.dockerfiles/release/x86-64-unknown-linux-gnu/build-and-push.bash b/.dockerfiles/release/x86-64-unknown-linux-gnu/build-and-push.bash
index 45b9ba89fe..091c6dc5c5 100644
--- a/.dockerfiles/release/x86-64-unknown-linux-gnu/build-and-push.bash
+++ b/.dockerfiles/release/x86-64-unknown-linux-gnu/build-and-push.bash
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# *** You should already be logged in to DockerHub when you run this ***
+# ** You should already be logged in to DockerHub and GHCR when you run this **
 #
 # Builds docker release images with two tags:
 #
@@ -41,12 +41,26 @@ set -o nounset
 
 DOCKERFILE_DIR="$(dirname "$0")"
 
+## DockerHub
+
+# Build and push :VERSION tag e.g. ponylang/ponyup:0.32.1
+DOCKER_TAG="${GITHUB_REPOSITORY}:${VERSION}"
+docker build --pull -t "${DOCKER_TAG}" "${DOCKERFILE_DIR}"
+docker push "${DOCKER_TAG}"
+
+# Build and push "release" tag e.g. ponylang/ponyup:release
+DOCKER_TAG="${GITHUB_REPOSITORY}:release"
+docker build --pull -t "${DOCKER_TAG}" "${DOCKERFILE_DIR}"
+docker push "${DOCKER_TAG}"
+
+## GitHub Container Registry
+
 # Build and push :VERSION tag e.g. ponylang/ponyup:0.32.1
-DOCKER_TAG=${GITHUB_REPOSITORY}:"${VERSION}"
+DOCKER_TAG="ghcr.io/${GITHUB_REPOSITORY}:${VERSION}"
 docker build --pull -t "${DOCKER_TAG}" "${DOCKERFILE_DIR}"
 docker push "${DOCKER_TAG}"
 
 # Build and push "release" tag e.g. ponylang/ponyup:release
-DOCKER_TAG=${GITHUB_REPOSITORY}:release
+DOCKER_TAG="ghcr.io/${GITHUB_REPOSITORY}:release"
 docker build --pull -t "${DOCKER_TAG}" "${DOCKERFILE_DIR}"
 docker push "${DOCKER_TAG}"
diff --git a/.dockerfiles/release/x86-64-unknown-linux-musl/build-and-push.bash b/.dockerfiles/release/x86-64-unknown-linux-musl/build-and-push.bash
index 5570f34724..d4120dbc17 100644
--- a/.dockerfiles/release/x86-64-unknown-linux-musl/build-and-push.bash
+++ b/.dockerfiles/release/x86-64-unknown-linux-musl/build-and-push.bash
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# *** You should already be logged in to DockerHub when you run this ***
+# ** You should already be logged in to DockerHub and GHCR when you run this **
 #
 # Builds docker release images with two tags:
 #
@@ -41,12 +41,26 @@ set -o nounset
 
 DOCKERFILE_DIR="$(dirname "$0")"
 
+## DockerHub
+
+# Build and push :VERSION tag e.g. ponylang/ponyup:0.32.1-alpine
+DOCKER_TAG="${GITHUB_REPOSITORY}:${VERSION}-alpine"
+docker build --pull -t "${DOCKER_TAG}" "${DOCKERFILE_DIR}"
+docker push "${DOCKER_TAG}"
+
+# Build and push "release" tag e.g. ponylang/ponyup:release-alpine
+DOCKER_TAG="${GITHUB_REPOSITORY}:release-alpine"
+docker build --pull -t "${DOCKER_TAG}" "${DOCKERFILE_DIR}"
+docker push "${DOCKER_TAG}"
+
+## GitHub Container Registry
+
 # Build and push :VERSION tag e.g. ponylang/ponyup:0.32.1-alpine
-DOCKER_TAG=${GITHUB_REPOSITORY}:"${VERSION}-alpine"
+DOCKER_TAG="ghcr.io/${GITHUB_REPOSITORY}:${VERSION}-alpine"
 docker build --pull -t "${DOCKER_TAG}" "${DOCKERFILE_DIR}"
 docker push "${DOCKER_TAG}"
 
 # Build and push "release" tag e.g. ponylang/ponyup:release-alpine
-DOCKER_TAG=${GITHUB_REPOSITORY}:release-alpine
+DOCKER_TAG="ghcr.io/${GITHUB_REPOSITORY}:release-alpine"
 docker build --pull -t "${DOCKER_TAG}" "${DOCKERFILE_DIR}"
 docker push "${DOCKER_TAG}"
diff --git a/.github/workflows/cloudsmith-package-sychronised.yml b/.github/workflows/cloudsmith-package-sychronised.yml
index 6b07837dd1..5cb7e7abac 100644
--- a/.github/workflows/cloudsmith-package-sychronised.yml
+++ b/.github/workflows/cloudsmith-package-sychronised.yml
@@ -21,11 +21,18 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - name: Docker login
+      - name: Login to DockerHub
         run: docker login -u "$DOCKER_USERNAME" -p "$DOCKER_PASSWORD"
         env:
           DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
           DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
+      - name: Login to GitHub Container Registry
+        # v2.2.0
+        uses: docker/login-action@465a07811f14bebb1938fbed4728c6a1ff8901fc
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
       - name: Build and push
         run: bash .dockerfiles/latest/x86-64-unknown-linux-gnu/build-and-push.bash
       - name: Alert on failure
@@ -49,11 +56,18 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - name: Docker login
+      - name: Login to DockerHub
         run: docker login -u "$DOCKER_USERNAME" -p "$DOCKER_PASSWORD"
         env:
           DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
           DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
+      - name: Login to GitHub Container Registry
+        # v2.2.0
+        uses: docker/login-action@465a07811f14bebb1938fbed4728c6a1ff8901fc
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
       - name: Build and push
         run: bash .dockerfiles/latest/x86-64-unknown-linux-musl/build-and-push.bash
       - name: Alert on failure
@@ -77,11 +91,18 @@ jobs:
     runs-on: windows-2022
     steps:
       - uses: actions/checkout@v3
-      - name: Docker login
-        run: "docker login -u $env:DOCKER_USERNAME -p $env:DOCKER_PASSWORD"
+      - name: Login to DockerHub
+        run: docker login -u "$DOCKER_USERNAME" -p "$DOCKER_PASSWORD"
         env:
           DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
           DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
+      - name: Login to GitHub Container Registry
+        # v2.2.0
+        uses: docker/login-action@465a07811f14bebb1938fbed4728c6a1ff8901fc
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
       - name: Build and push
         run: .dockerfiles/latest/x86-64-pc-windows-msvc/build-and-push.ps1
       - name: Alert on failure
@@ -105,11 +126,18 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - name: Docker login
+      - name: Login to DockerHub
         run: docker login -u "$DOCKER_USERNAME" -p "$DOCKER_PASSWORD"
         env:
           DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
           DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
+      - name: Login to GitHub Container Registry
+        # v2.2.0
+        uses: docker/login-action@465a07811f14bebb1938fbed4728c6a1ff8901fc
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
       - name: Build and push
         run: bash .dockerfiles/release/x86-64-unknown-linux-gnu/build-and-push.bash
         env:
@@ -124,11 +152,18 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - name: Docker login
+      - name: Login to DockerHub
         run: docker login -u "$DOCKER_USERNAME" -p "$DOCKER_PASSWORD"
         env:
           DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
           DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
+      - name: Login to GitHub Container Registry
+        # v2.2.0
+        uses: docker/login-action@465a07811f14bebb1938fbed4728c6a1ff8901fc
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
       - name: Build and push
         run: bash .dockerfiles/release/x86-64-unknown-linux-musl/build-and-push.bash
         env:
@@ -143,11 +178,18 @@ jobs:
     runs-on: windows-2022
     steps:
       - uses: actions/checkout@v3
-      - name: Docker login
-        run: "docker login -u $env:DOCKER_USERNAME -p $env:DOCKER_PASSWORD"
+      - name: Login to DockerHub
+        run: docker login -u "$DOCKER_USERNAME" -p "$DOCKER_PASSWORD"
         env:
           DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
           DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
+      - name: Login to GitHub Container Registry
+        # v2.2.0
+        uses: docker/login-action@465a07811f14bebb1938fbed4728c6a1ff8901fc
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
       - name: Build and push
         run: .dockerfiles/release/x86-64-pc-windows-msvc/build-and-push.ps1
         env:
@@ -428,3 +470,30 @@ jobs:
           repository: ${{ matrix.repo }}
           event-type: ponyc-musl-released
           client-payload: '{"version": "${{ github.event.client_payload.data.version }}"}'
+
+  prune-untagged-images:
+    needs:
+      - build-latest-musl-docker-image
+
+    name: Prune untagged images
+    runs-on: ubuntu-latest
+    steps:
+      - name: Prune
+        # v4.1.1
+        uses: actions/delete-package-versions@0d39a63126868f5eefaa47169615edd3c0f61e20
+        with:
+          package-name: 'ponyc'
+          package-type: 'container'
+          min-versions-to-keep: 1
+          delete-only-untagged-versions: 'true'
+      - name: Send alert on failure
+        if: ${{ failure() }}
+        uses: zulip/github-actions-zulip/send-message@b62d5a0e48a4d984ea4fce5dd65ba691963d4db4
+        with:
+          api-key: ${{ secrets.ZULIP_SCHEDULED_JOB_FAILURE_API_KEY }}
+          email: ${{ secrets.ZULIP_SCHEDULED_JOB_FAILURE_EMAIL }}
+          organization-url: 'https://ponylang.zulipchat.com/'
+          to: notifications
+          type: stream
+          topic: ${{ github.repository }} scheduled job failure
+          content: ${{ github.server_url}}/${{ github.repository }}/actions/runs/${{ github.run_id }} failed.
diff --git a/RELEASE_PROCESS.md b/RELEASE_PROCESS.md
index 06923314a7..aaf7e992bc 100644
--- a/RELEASE_PROCESS.md
+++ b/RELEASE_PROCESS.md
@@ -9,12 +9,15 @@ This document is aimed at members of the Pony team who might be cutting a releas
 
 ### Validate external services are functional
 
-We rely on Cloudsmith, DockerHub, and GitHub Actions as part of our release process. All  need to be up and functional in order to do a release. Check the status of each before starting a release. If any are reporting issues, push the release back a day or until whenever they are all reporting no problems.
+We rely on Cloudsmith and GitHub Actions as part of our release process. Both need to be up and functional in order to do a release. Check the status of each before starting a release. If any are reporting issues, push the release back a day or until whenever they are all reporting no problems.
 
 * [Cloudsmith](https://status.cloudsmith.io/)
-* [DockerHub](https://status.docker.com/)
 * [GitHub](https://www.githubstatus.com/)
 
+We are in the process of migrating off of DockerHub, while that migration is going on, we are also relying on it, so you need to make sure it is functional before doing a release.
+
+* [DockerHub](https://status.docker.com/)
+
 ## Releasing
 
 Please note that this document was written with the assumption that you are using a clone of the `ponyc` repo. You have to be using a clone rather than a fork. It is advised that you do this by making a fresh clone of the `ponyc` repo from which you will release.
@@ -63,11 +66,11 @@ As part of every release, 6 Docker images are built:
 * Alpine images
   * release-alpine
   * 0.3.1-alpine
-* Windows imags
+* Windows images
   * release-windows
   * 0.3.1-windows
 
-The images are built via GitHub action after Linux releases have been uploaded to Cloudsmith. Cloudsmith sends an event to GitHub that triggers Docker images builds in the ["Handle External Events" workflow](https://github.com/ponylang/ponyc/actions?query=workflow%3A%22Handle+external+events%22).You can track the progress of the builds (including failures) there. You can validate that all the images have been pushed by checking the [tag page](https://hub.docker.com/r/ponylang/ponyc/tags) of the [ponyc DockerHub repository](https://hub.docker.com/r/ponylang/ponyc/).
+The images are built via GitHub action after Linux releases have been uploaded to Cloudsmith. Cloudsmith sends an event to GitHub that triggers Docker images builds in the ["Handle External Events" workflow](https://github.com/ponylang/ponyc/actions?query=workflow%3A%22Handle+external+events%22).You can track the progress of the builds (including failures) there. You can validate that all the images have been pushed by checking the tags of the [ponylang/ponyc package](https://github.com/ponylang/ponyc/pkgs/container/ponyc).
 
 ### Verify that the Pony Playground updated to the new version