diff --git a/examples/tensorflow/train/crnn/requirements.txt b/examples/tensorflow/train/crnn/requirements.txt
index a2f581b..7017291 100644
--- a/examples/tensorflow/train/crnn/requirements.txt
+++ b/examples/tensorflow/train/crnn/requirements.txt
@@ -1,6 +1,6 @@
 tensorflow_gpu==1.6.0
 numpy==1.13.1
-opencv_python==3.2.0.7
+opencv_python==3.4.7.28
 matplotlib==2.0.2
 easydict==1.6
 tensorflow==1.6.0