diff --git a/moPepGen/__init__.py b/moPepGen/__init__.py
index f826cde6..2521938b 100644
--- a/moPepGen/__init__.py
+++ b/moPepGen/__init__.py
@@ -8,7 +8,7 @@
 from . import constant
 
 
-__version__ = '1.4.5'
+__version__ = '1.4.6-rc1'
 
 ## Error messages
 ERROR_INDEX_IN_INTRON = 'The genomic index seems to be in an intron'