diff --git a/requirements_dev.txt b/requirements_dev.txt
index b1c1c4502..22c78ea5b 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -3,7 +3,7 @@
 # pip install -r requirements_dev.txt
 #---------------------------------------------------------
 coveralls==3.2.0
-flake8==3.9.2
+flake8==5.0.4
 pillow==8.3.1
 pytest==6.2.4
 pytest-cache==1.0