diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c3d6076..b256504 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,7 +13,7 @@ jobs:
         xcode: ['16.1']
         config: ['debug', 'release']
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Select Xcode ${{ matrix.xcode }}
       run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app
     - name: Swift Version
@@ -21,13 +21,16 @@ jobs:
     - name: Run ${{ matrix.xcode }} Tests
       run: make CONFIG=${{ matrix.config }} test-library
 
-#   ubuntu:
-#     name: Ubuntu
-#     runs-on: ubuntu-20.04
-#     steps:
-#     - uses: swift-actions/setup-swift@v1
-#       with:
-#         swift-version: 5.7
-#     - uses: actions/checkout@v3
-#     - name: Run Tests
-#       run: make DOCKER_PLATFORM=linux/amd64 test-linux
+  ubuntu:
+    name: Ubuntu
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Setup just.
+      uses: extractions/setup-just
+    - name: Setup QEMU
+      uses: docker/setup-qemu-action@v3
+    - name: Setup buildx
+      uses: docker/setup-buildx-action@v3
+    - name: Run tests.
+      run: just test-docker