diff --git a/requirements_dev.txt b/requirements_dev.txt
index a496588..57b4a52 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -3,5 +3,5 @@ pytest-mock==3.3.1
 click==8.1.3
 executor>=21.0
 black==23.3.0
-flake8 >=3.7.9,<4.0
+flake8 >=3.7.9,<7.0
 flake8-import-order >=0.18.1,<0.19