diff --git a/.github/workflows/flake8.yml b/.github/workflows/flake8.yml
index c0a3629b..b4beb4b4 100644
--- a/.github/workflows/flake8.yml
+++ b/.github/workflows/flake8.yml
@@ -21,6 +21,6 @@ jobs:
       - name: flake8 Lint
         uses: py-actions/flake8@v2
         with:
-          ignore: "E501"
+          ignore: "E501,E121,E123,E126,E226,E24,E704,W503,W504"
           exclude: "__init__.py, input/__init__.py"
           path: "pyerrors"
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 8d803e4a..22aa0798 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -33,6 +33,6 @@ pytest --cov=pyerrors --cov-report html
 ```
 The linter `flake8` is executed with the command
 ```
-flake8 --ignore=E501 --exclude=__init__.py pyerrors
+flake8 --extend-ignore=E501 --exclude=__init__.py pyerrors
 ```
 Please make sure that all tests are passed for a new pull requests.