diff --git a/dev-requirements.txt b/dev-requirements.txt
index e6d51694..981e4c90 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -1,4 +1,4 @@
-black==21.7b0
+black==21.8b0
 docformatter==1.4
 filelock==3.0.12
 flake8==3.9.2