diff --git a/requirements_dev.txt b/requirements_dev.txt
index f6413e5..c5d4294 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -4,7 +4,7 @@ numpy==1.16.3
 pandas==0.20.3
 matplotlib==2.0.2
 opencv-contrib-python==3.3.0.9
-opencv-python==3.3.0.9
+opencv-python==3.4.7.28
 pillow==4.2.1
 pymodbus==1.3.2
 pyserial==3.4