diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 16b1eff..e4845f9 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -29,7 +29,7 @@ jobs:
     # Cache EXOSIMS data (downloads + computed cache like completeness, star fluxes)
     # Only invalidates when dependencies change (uv.lock hash)
     - name: Cache EXOSIMS data
-      uses: actions/cache@v5
+      uses: actions/cache@v6
       with:
         path: ~/.EXOSIMS
         key: exosims-${{ runner.os }}-${{ hashFiles('uv.lock') }}