diff --git a/mutatest/__init__.py b/mutatest/__init__.py
index 9eb48e0..ab385da 100644
--- a/mutatest/__init__.py
+++ b/mutatest/__init__.py
@@ -1,6 +1,6 @@
 """Mutation initialization.
 """
-__version__ = "0.9.0-dev"
+__version__ = "0.9.0"
 
 __title__ = "mutatest"
 __description__ = "Python mutation testing: test your tests!"