diff --git a/.github/workflows/Python_tests.yml b/.github/workflows/Python_tests.yml
index 1a6e422..e07c1b2 100644
--- a/.github/workflows/Python_tests.yml
+++ b/.github/workflows/Python_tests.yml
@@ -9,7 +9,7 @@ jobs:
         os: [macos-latest]
         python-version: [2.7, 3.8]
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v1
         with:
@@ -26,9 +26,9 @@ jobs:
       - name: Lint with flake8
         run: |
           # stop the build if there are Python syntax errors or undefined names
-          flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+          flake8 . builtins=_ --count --select=E9,F63,F7,F82 --show-source --statistics
           # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-          flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+          flake8 . builtins=_ --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
       #- name: Test with pytest
       #  run: pytest
       #- name: Run doctests with pytest