diff --git a/.github/workflows/cargo-check.yaml b/.github/workflows/cargo-check.yaml
index 87f0acb..c46c00e 100644
--- a/.github/workflows/cargo-check.yaml
+++ b/.github/workflows/cargo-check.yaml
@@ -1,4 +1,4 @@
-name: cargo checks
+name: Cargo checks
 
 on:
   pull_request:
diff --git a/.github/workflows/docker-image-builds.yml b/.github/workflows/docker-image-builds.yml
new file mode 100644
index 0000000..5aa42e1
--- /dev/null
+++ b/.github/workflows/docker-image-builds.yml
@@ -0,0 +1,16 @@
+name: Docker image builds
+
+on: pull_request
+
+concurrency:
+  group: pr-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  validate-docker-image-builds:
+    name: Validate Docker image builds
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Docker build
+        run: "docker build --pull docker/."
diff --git a/docker/Dockerfile b/docker/Dockerfile
index 47a4eda..d12a2a9 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,4 +1,4 @@
-FROM ponylang/ponyc:release-alpine
+FROM ghcr.io/ponylang/ponyc:release-alpine
 COPY bin/compile.sh bin/evaluate.sh /usr/local/bin/
 
 ENV CC=gcc