diff --git a/requirements_tests.txt b/requirements_tests.txt
index 3bf4a70da..9b114d683 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==1.5.0
-flake8==3.8.4
+flake8==3.9.0
 pre-commit==2.11.1
 pydocstyle==5.1.1
 pylint==2.7.2