diff --git a/pyfaidx/__init__.py b/pyfaidx/__init__.py
index 9318521..4b3617a 100644
--- a/pyfaidx/__init__.py
+++ b/pyfaidx/__init__.py
@@ -25,7 +25,7 @@
 
 dna_bases = re.compile(r'([ACTGNactgnYRWSKMDVHBXyrwskmdvhbx]+)')
 
-__version__ = '0.5.5'
+__version__ = '0.5.5.1'
 
 
 class KeyFunctionError(ValueError):