diff --git a/.github/actions/run_tests/action.yaml b/.github/actions/run_tests/action.yaml
index 79c99964..efb2d87d 100644
--- a/.github/actions/run_tests/action.yaml
+++ b/.github/actions/run_tests/action.yaml
@@ -21,7 +21,7 @@ runs:
     shell: bash
 
   - name: poetry cache # Change CACHE_STRING secret to bust the cache
-    uses: actions/cache@v3
+    uses: actions/cache@v4
     with:
       path: .venv
       key: ${{ runner.os }}-${{ hashFiles('poetry.lock') }}-${{ env.PYTHON_FULL_VERSION }}-${{ inputs.cache-string }}
diff --git a/.github/workflows/docs.yaml b/.github/workflows/docs.yaml
index ff40de92..2ffb2107 100644
--- a/.github/workflows/docs.yaml
+++ b/.github/workflows/docs.yaml
@@ -50,13 +50,13 @@ jobs:
       run: echo "PYTHON_FULL_VERSION=$(python --version)" >> "$GITHUB_ENV"
 
     - name: poetry cache
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: .venv
         key: ${{ runner.os }}-${{ hashFiles('poetry.lock') }}-${{ env.PYTHON_FULL_VERSION }}-${{ secrets.CACHE_STRING }}
 
     - name: npm cache
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: node_modules
         key: ${{ runner.os }}-pa11y-v3