diff --git a/requirements_tests.txt b/requirements_tests.txt
index 913800083..e86cd9f4c 100644
--- a/requirements_tests.txt
+++ b/requirements_tests.txt
@@ -2,7 +2,7 @@ black==20.8b1
 codecov==2.1.11
 coverage==5.5
 flake8-docstrings==1.6.0
-flake8==3.9.0
+flake8==3.9.1
 pre-commit==2.12.0
 pydocstyle==6.0.0
 pylint==2.7.4