diff --git a/hnn_core/__init__.py b/hnn_core/__init__.py
index 11c04f023..542a28f75 100644
--- a/hnn_core/__init__.py
+++ b/hnn_core/__init__.py
@@ -7,4 +7,4 @@
 from .cells_default import pyramidal, basket
 from .parallel_backends import MPIBackend, JoblibBackend
 
-__version__ = '0.4rc0'
+__version__ = '0.4rc1'