diff --git a/requirements.txt b/requirements.txt
index ad4c21da1..c3ab49804 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,6 +8,7 @@ kiwisolver==1.0.1
 matplotlib==2.2.2
 networkx==2.1
 numpy==1.15.0
+opencv-python==4.2.0.34
 pandas==0.23.4
 Pillow==6.2.2
 pycparser==2.18