diff --git a/lentil/__init__.py b/lentil/__init__.py
index 4f14d94..5324bcd 100644
--- a/lentil/__init__.py
+++ b/lentil/__init__.py
@@ -8,4 +8,4 @@
 from lentil import wfe
 from lentil import zernike
 
-__version__ = '0.5.0b3'
+__version__ = '0.5.0b4'