diff --git a/setup.py b/setup.py
index 3591628..8170c87 100644
--- a/setup.py
+++ b/setup.py
@@ -35,7 +35,7 @@
         'numpy', 
         'scipy', 
         'pillow', 
-        'pyglet', 
+        'pyglet==1.5.5', 
         'jupyter', 
         'webcolors', 
         'ipyevents',