diff --git a/requirements_test.txt b/requirements_test.txt
index ef8a762..7f2bb4c 100644
--- a/requirements_test.txt
+++ b/requirements_test.txt
@@ -1,6 +1,6 @@
 black==20.8b1
 codespell==2.0.0
-flake8==3.8.3
+flake8==3.8.4
 mypy==0.782
 pydocstyle==5.1.1
 cryptography==3.2