diff --git a/requirements_test.txt b/requirements_test.txt
index 11e5f87..664123f 100644
--- a/requirements_test.txt
+++ b/requirements_test.txt
@@ -1,6 +1,6 @@
 black==19.10b0
 coverage==5.5
-flake8==3.8.4
+flake8==3.9.1
 flake8-docstrings==1.5.0
 pre-commit==2.10.1
 pylint==2.8.2