diff --git a/setup.cfg b/setup.cfg
index b3dc2e8..209cb07 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -31,7 +31,7 @@ install_requires =
   numpy>=1.15
   scipy
   matplotlib
-  zprocess==2.20.3
+  zprocess==2.20.2
 
 [options.extras_require]
 docs =