diff --git a/requirements/dev.txt b/requirements/dev.txt
index 77bda22..20d5b51 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -1,3 +1,3 @@
 flake8==3.9.2
-black==21.8b0
+black==21.9b0
 isort==5.9.3