diff --git a/requirements-dev.txt b/requirements-dev.txt
index 4f670985..e27c1cf8 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,3 +1,4 @@
 # the version of black is specified also in the stylish.yml github workflow;
 # please update the version there in case it is bumped here
 black==24.2.0
+flake8