diff --git a/setup.py b/setup.py
index 711e2560..b7aa71be 100644
--- a/setup.py
+++ b/setup.py
@@ -15,7 +15,7 @@
     "Pillow",
     "matplotlib",
     "scikit-image>=0.14.2",
-    "opencv-python-headless",
+    "opencv-python-headless<4",
     "imageio<=2.6.1; python_version<'3.5'",
     "imageio; python_version>='3.5'",
     "Shapely"