diff --git a/HISTORY.rst b/HISTORY.rst
index ae57460..f8ddd05 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -6,7 +6,7 @@ History
 .. to_doc
 
 ---------------------
-18.5.12.dev0
+18.5.12 (2018-05-22)
 ---------------------
 
 * Update test data processing to allow URIs in Galaxy workflow tests.
diff --git a/galaxy/__init__.py b/galaxy/__init__.py
index 3ca790b..ff12c8b 100644
--- a/galaxy/__init__.py
+++ b/galaxy/__init__.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 
-__version__ = '18.5.12.dev0'
+__version__ = '18.5.12'
 
 PROJECT_NAME = "galaxy-lib"
 PROJECT_OWNER = PROJECT_USERAME = "galaxyproject"