diff --git a/dev-requirements.txt b/dev-requirements.txt
index b188ed1a..faefc4dd 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -1,7 +1,7 @@
 -r requirements.txt
 
 pytest==7.2.0
-flake8==6.0.0
+flake8==5.0.4  # v5.0.4 is the last to support Python 3.7
 pytest-timeout==2.1.0
 pytest-asyncio==0.20.3
 requests==2.28.1