diff --git a/.github/workflows/valid-style.yml b/.github/workflows/valid-style.yml
index 53be8b30a7d..d278640a0c2 100644
--- a/.github/workflows/valid-style.yml
+++ b/.github/workflows/valid-style.yml
@@ -44,7 +44,7 @@ jobs:
         cache: 'pip'
     - name: Install Python packages
       run: |
-        python3 -m pip install --upgrade pip setuptools types-six black==23.1.0 mypy isort clingo flake8
+        python3 -m pip install --upgrade pip setuptools types-six black==23.1.0 mypy isort clingo flake8==6.0.0
     - name: Setup git configuration
       run: |
         # Need this for the git tests to succeed.