diff --git a/requirements.txt b/requirements.txt
index cde85f8f..20c7d2a3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@ binaryornot==0.4.4
 
 # Code quality
 # ------------------------------------------------------------------------------
-black==21.8b0
+black==21.9b0
 isort==5.9.3
 flake8==3.9.2
 flake8-isort==4.0.0