diff --git a/.github/workflows/csl-ci.yml b/.github/workflows/csl-ci.yml
index 37e89fe..66d99be 100644
--- a/.github/workflows/csl-ci.yml
+++ b/.github/workflows/csl-ci.yml
@@ -22,7 +22,7 @@ jobs:
         run: |
           python -u mathematical_proof_system.py
       - name: Upload .cslx
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: cslx
           path: mathematical_proof_system.py.cslx