diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index e8038220..b7feb4bd 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -10,6 +10,9 @@ on:
 
 jobs:
   build:
+    defaults:
+      run:
+        shell: bash
     runs-on: ${{ matrix.os }}
     strategy:
       max-parallel: 6
@@ -43,7 +46,7 @@ jobs:
         uses: actions/cache@v2
         with:
           path: .venv
-          key: venv-${{ runner.os }}-${{ matrix.python-version }}-${{ hashFiles('**/poetry.lock') }}
+          key: venv-${{ matrix.os }}-${{ matrix.python-version }}-${{ hashFiles('**/poetry.lock') }}
 
       - name: Project dependencies
         if: steps.cached-poetry-dependencies.outputs.cache-hit != 'true'