diff --git a/requirements.txt b/requirements.txt
index fdbb1c9..1f67677 100755
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,7 @@
 click>=6.7
 matplotlib>=2.2.3
 numpy>=1.13.3
+opencv-python>=3.4.2.17
 openpyxl>=2.5.8
 pandas>=0.23.4
 pdfminer.six>=20170720