diff --git a/requirements_dev.txt b/requirements_dev.txt
index ff23148..e8d17d2 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -3,7 +3,7 @@ ipywidgets==6.0.0
 numpy==1.13.1
 pandas==0.20.3
 matplotlib==2.0.2
-opencv-contrib-python==3.3.0.9
+opencv-contrib-python==4.1.0.25
 opencv-python==3.3.0.9
 pillow==4.2.1
 pymodbus==1.3.2