diff --git a/CHANGELOG b/CHANGELOG
index ebe4d7d..64f91db 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,4 +1,4 @@
-v0.6 (unreleased):
+v0.5.1 (released March 03, 2018):
 
 - Improved behavior when adding parameters to templates (via Template.add())
   with poorly formatted whitespace conventions. (#185)
diff --git a/appveyor.yml b/appveyor.yml
index 70b71b4..e99f54e 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,6 +1,6 @@
 # This config file is used by appveyor.com to build Windows release binaries
 
-version: 0.6.dev0-b{build}
+version: 0.5.1-b{build}
 
 branches:
   only:
diff --git a/docs/changelog.rst b/docs/changelog.rst
index 7aa8f22..4e637d2 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -1,11 +1,11 @@
 Changelog
 =========
 
-v0.6
-----
+v0.5.1
+------
 
-Unreleased
-(`changes <https://github.com/earwig/mwparserfromhell/compare/v0.5...develop>`__):
+`Released March 03, 2018 <https://github.com/earwig/mwparserfromhell/tree/v0.5.1>`_
+(`changes <https://github.com/earwig/mwparserfromhell/compare/v0.5...v0.5.1>`__):
 
 - Improved behavior when adding parameters to templates (via
   :meth:`.Template.add`) with poorly formatted whitespace conventions.
diff --git a/mwparserfromhell/__init__.py b/mwparserfromhell/__init__.py
index 11e1094..ab8514a 100644
--- a/mwparserfromhell/__init__.py
+++ b/mwparserfromhell/__init__.py
@@ -29,7 +29,7 @@ outrageously powerful parser for `MediaWiki <http://mediawiki.org>`_ wikicode.
 __author__ = "Ben Kurtovic"
 __copyright__ = "Copyright (C) 2012-2018 Ben Kurtovic"
 __license__ = "MIT License"
-__version__ = "0.6.dev0"
+__version__ = "0.5.1"
 __email__ = "ben.kurtovic@gmail.com"
 
 from . import (compat, definitions, nodes, parser, smart_list, string_mixin,