diff --git a/requirements-dev.txt b/requirements-dev.txt
index a3ed37bea..3f2d6035d 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -4,7 +4,7 @@
 -r requirements-hyperopt.txt
 
 coveralls==3.2.0
-flake8==3.9.2
+flake8==4.0.0
 flake8-type-annotations==0.1.0
 flake8-tidy-imports==4.4.1
 mypy==0.910