diff --git a/requirements.txt b/requirements.txt
index 66ea9fe..354073d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ pip==9.0.1
 bumpversion==0.5.3
 wheel==0.30.0
 watchdog==0.8.3
-flake8==3.5.0
+flake8==4.0.1
 tox==2.8.2
 coverage==4.4.1
 Sphinx==1.7.9