diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index bd866e0..63fa124
--- a/requirements.txt
+++ b/requirements.txt
@@ -57,7 +57,7 @@ nbformat==4.4.0
 notebook==5.5.0
 numexpr==2.6.5
 numpy==1.15.0
-opencv-python==3.4.1.15
+opencv-python==3.4.7.28
 pandocfilters==1.4.2
 parso==0.2.1
 pexpect==4.6.0