diff --git a/README.md b/README.md
index a2b4a5e4..9c641931 100644
--- a/README.md
+++ b/README.md
@@ -66,7 +66,7 @@ Tested under python3.
   - numpy
   - scipy
   - opencv
-  - pyyaml
+  - pyyaml>=3.12
   - packaging
   - [pycocotools](https://github.com/cocodataset/cocoapi)  — for COCO dataset, also available from pip.
   - tensorboardX  — for logging the losses in Tensorboard