diff --git a/requirements_dev.txt b/requirements_dev.txt
index 88f74ba..4e6b09e 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -2,7 +2,7 @@ pip==18.0
 bumpversion==0.5.3
 wheel==0.31.1
 watchdog==0.8.3
-flake8==3.5.0
+flake8==6.0.0
 tox==3.2.1
 coverage==4.5.1
 Sphinx==1.7.7