diff --git a/.gitea/workflows/build.yaml b/.gitea/workflows/build.yaml
index 2b83bc5..70fb23f 100644
--- a/.gitea/workflows/build.yaml
+++ b/.gitea/workflows/build.yaml
@@ -6,6 +6,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/cache@v4
+        with:
+          path: prime-numbers
+          key: ${{ runner.os }}-primes
       - run: apt install -y python3 python3-pip
       - run: pip install screenplain
       - run: pip install 'screenplain[PDF]'