diff --git a/dev-requirements.txt b/dev-requirements.txt
index 536d8324..c2e424f3 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -1,7 +1,7 @@
 black==21.9b0
 docformatter==1.4
 filelock==3.3.1
-flake8==3.9.2
+flake8==4.0.1
 isort==5.9.3
 pytest==6.2.5
 pytest-xdist==2.4.0