diff --git a/python/snewpy/_version.py b/python/snewpy/_version.py
index 51ed7c48..a5f08e49 100644
--- a/python/snewpy/_version.py
+++ b/python/snewpy/_version.py
@@ -1 +1 @@
-__version__ = '1.5.1'
+__version__ = '1.6b1'