diff --git a/.github/workflows/mmbm-tests.yml b/.github/workflows/mmbm-tests.yml
index bc7e7a9d..c300cf69 100644
--- a/.github/workflows/mmbm-tests.yml
+++ b/.github/workflows/mmbm-tests.yml
@@ -11,7 +11,22 @@ jobs:
       - name: Check out code
         uses: actions/checkout@v4
 
+      - name: Restore .build
+        id: "restore-build"
+        uses: actions/cache/restore@v4
+        with:
+          path: .build
+          key: "swiftpm-build-${{ runner.os }}-${{ github.event.pull_request.base.sha || github.event.after }}"
+          restore-keys: "swiftpm-build-${{ runner.os }}-"
+
       - name: Run unit tests
         run: swift test --enable-code-coverage
 
+      - name: Cache .build
+        if: steps.restore-build.outputs.cache-hit != 'true'
+        uses: actions/cache/save@v4
+        with:
+          path: .build
+          key: "swiftpm-build-${{ runner.os }}-${{ github.event.pull_request.base.sha || github.event.after }}"
+
       # Process the code coverage report, etc...