diff --git a/setup.py b/setup.py
index c9096b6..361d3b3 100644
--- a/setup.py
+++ b/setup.py
@@ -42,7 +42,7 @@
         'matplotlib',
         'python-dateutil',
         'numpy',
-        'opencv-python==3.4.5.20',
+        'opencv-python>=3.4.5.20,<4',
         'confapp',
         'natsort'
     ],