diff --git a/requirements_test.txt b/requirements_test.txt
index be70724..390cda3 100644
--- a/requirements_test.txt
+++ b/requirements_test.txt
@@ -1,6 +1,6 @@
 black==21.4b0
 codespell==2.0.0
-flake8==3.9.0
+flake8==3.9.1
 mypy==0.812
 pydocstyle==6.0.0
 cryptography==3.2