diff --git a/setup.py b/setup.py
index b286f00..0008d28 100644
--- a/setup.py
+++ b/setup.py
@@ -29,7 +29,9 @@
 
 LONG_DESCRIPTION = open('README.rst').read()
 
-INSTALLATION_REQUIREMENTS = ['colour-science>=0.3.12', 'opencv>=3.4.3']
+INSTALLATION_REQUIREMENTS = [
+    'colour-science>=0.3.12', 'opencv-python==3.4.5.20'
+]
 
 if os.environ.get('READTHEDOCS') == 'True':
     INSTALLATION_REQUIREMENTS = [