diff --git a/requirements_dev.txt b/requirements_dev.txt
index 861d348..23c852c 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -2,7 +2,7 @@ pip==19.2
 bumpversion==0.5.3
 wheel==0.33.1
 watchdog==0.9.0
-flake8==3.7.7
+flake8==6.0.0
 tox==3.9.0
 coverage==4.5.3
 Sphinx==2.0.1