diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 3119c5f..ce96290 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -35,7 +35,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v1
       - name: Build container
-        run: docker build . --file Dockerfile --tag octocatalog-diff:ruby${{matrix.ruby-version}} --build-arg RUBY_VERSION=${{matrix.ruby-version}}-stretch
+        run: docker build . --file Dockerfile --tag octocatalog-diff:ruby${{matrix.ruby-version}} --build-arg RUBY_VERSION=${{matrix.ruby-version}}-buster
       - name: Tests
         run: docker run -e PUPPET_VERSION -e PUPPET_VERSIONS -e RSPEC_TEST -e RUBOCOP_TEST -e ENFORCE_COVERAGE octocatalog-diff:ruby${{matrix.ruby-version}} /app/script/cibuild
 
@@ -54,7 +54,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v1
       - name: Build container
-        run: docker build . --file Dockerfile --tag octocatalog-diff:ruby${{matrix.ruby-version}} --build-arg RUBY_VERSION=${{matrix.ruby-version}}-stretch
+        run: docker build . --file Dockerfile --tag octocatalog-diff:ruby${{matrix.ruby-version}} --build-arg RUBY_VERSION=${{matrix.ruby-version}}-buster
       - name: Tests
         run: docker run -e PUPPET_VERSION -e PUPPET_VERSIONS -e RSPEC_TEST -e RUBOCOP_TEST -e ENFORCE_COVERAGE octocatalog-diff:ruby${{matrix.ruby-version}} /app/script/cibuild
       - name: Rubocop and Coverage