diff --git a/chapter6/yolov2-pytorch/requirements.txt b/chapter6/yolov2-pytorch/requirements.txt
index fa63059..cc22540 100644
--- a/chapter6/yolov2-pytorch/requirements.txt
+++ b/chapter6/yolov2-pytorch/requirements.txt
@@ -1,4 +1,4 @@
 Cython==0.27.3
-opencv-python==3.3.0.10
+opencv-python==3.4.0.12
 h5py==2.7.1
 pycrayon==0.5
\ No newline at end of file