diff --git a/requirements/requirements_dev.txt b/requirements/requirements_dev.txt
index a1bae58598..4af0af3285 100644
--- a/requirements/requirements_dev.txt
+++ b/requirements/requirements_dev.txt
@@ -21,3 +21,4 @@ sdb
 remote-pdb
 gprof2dot
 atomicwrites==1.4.0
+flake8