diff --git a/requirements.txt b/requirements.txt
index ab9348a..01dee89 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 openslide-python==1.1.1
 Pillow==6.2.0
-opencv-python==3.4.4.19
+opencv-python==4.2.0.32
 shapely==1.6.4
 pydaily==0.4.0
 pycontour==1.4.0