diff --git a/setup.cfg b/setup.cfg
index c8059367..4d6792f3 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -55,7 +55,7 @@ package_dir =
 
 [options.extras_require]
 psyneulink =
-    psyneulink
+    psyneulink<=0.15.1.0
 
 neuroml =
     pyNeuroML>=1.0.10