diff --git a/requirements.txt b/requirements.txt
index c14bc13..115c696 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
 torch >= 1.8
 torchvision >= 0.9.0
+black==21.4b2
 detectron2@https://github.com/facebookresearch/detectron2/archive/refs/tags/v0.6.tar.gz
 # detectron2@git+https://github.com/facebookresearch/detectron2.git@v0.6#egg=detectron2