diff --git a/requirements_dev.txt b/requirements_dev.txt
index 3f5cc38..fbbff0b 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -2,7 +2,7 @@ pip==21.2.4
 bumpversion==0.6.0
 wheel==0.37.0
 watchdog==2.1.3
-flake8==3.9.0
+flake8==4.0.1
 tox==3.24.2
 coverage==5.5
 cryptography==3.4.8