diff --git a/.github/workflows/python-tests.yml b/.github/workflows/python-tests.yml
index feda239c..8772a038 100644
--- a/.github/workflows/python-tests.yml
+++ b/.github/workflows/python-tests.yml
@@ -45,7 +45,7 @@ jobs:
       shell: bash
 
     - name: Cache conda env
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ${{ env.CONDA }}/envs
         key: conda-${{ matrix.os }}-${{ matrix.python-version }}-${{ env.cache_date }}-${{ hashFiles('dev-environment.yml') }}-${{ env.CACHE_NUMBER }}