diff --git a/requirements_dev.txt b/requirements_dev.txt
index b1b09cc..3ff360d 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,7 +1,7 @@
 bumpversion==0.5.3
 wheel==0.30.0
 watchdog==0.8.3
-flake8==3.5.0
+flake8==4.0.1
 tox==2.9.1
 coverage==4.4.1
 Sphinx==1.6.5