diff --git a/.github/workflows/flake8.yml b/.github/workflows/flake8.yml
index e75a5ae1..efb81565 100644
--- a/.github/workflows/flake8.yml
+++ b/.github/workflows/flake8.yml
@@ -21,6 +21,6 @@ jobs:
       - name: flake8 Lint
         uses: py-actions/flake8@v1
         with:
-          ignore: "E501,E722"
+          ignore: "E501"
           exclude: "__init__.py, input/__init__.py"
           path: "pyerrors"
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index df206c99..cd627bd2 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -30,6 +30,6 @@ pytest --cov=pyerrors --cov-report html
 ```
 The linter `flake8` is executed with the command
 ```
-flake8 --ignore=E501,E722 --exclude=__init__.py pyerrors
+flake8 --ignore=E501 --exclude=__init__.py pyerrors
 ```
 Please make sure that all tests are passed for a new pull requests.