diff --git a/Sfilter/__init__.py b/Sfilter/__init__.py
index 4e36314..6505940 100644
--- a/Sfilter/__init__.py
+++ b/Sfilter/__init__.py
@@ -4,4 +4,4 @@
 from .util.output_wrapper import read_k_cylinder
 from .util import MSM
 
-__version__ = '0.5.5_dev'
+__version__ = '0.5.5'