diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 1937b93b5dda..332a0b81c45b
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ scipy>=1.4.1  # Google Colab version
 torch>=1.7.0
 torchvision>=0.8.1
 tqdm>=4.41.0
-protobuf<=3.20.1  # https://github.com/ultralytics/yolov5/issues/8012
+protobuf<4.21.3  # https://github.com/ultralytics/yolov5/issues/8012
 
 # Logging -------------------------------------
 tensorboard>=2.4.1