diff --git a/CHANGES.txt b/CHANGES.txt
index 2373fde..9d2678c 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,6 +1,13 @@
 Changes
 =======
 
+4.2.1 (2018-04-18)
+------------------
+
+- Fix unicode string interpolation on Python 2.7
+  [aleksihakli]
+
+
 4.2.0 (2018-04-13)
 ------------------
 
diff --git a/axes/__init__.py b/axes/__init__.py
index 8f8a575..732b4ec 100644
--- a/axes/__init__.py
+++ b/axes/__init__.py
@@ -1,6 +1,6 @@
 from __future__ import unicode_literals
 
-__version__ = '4.2.0'
+__version__ = '4.2.1'
 
 default_app_config = 'axes.apps.AppConfig'
 
diff --git a/docs/conf.py b/docs/conf.py
index a9dd74f..6deb8e7 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -17,6 +17,8 @@ import os
 import shlex
 import sphinx_rtd_theme
 
+import axes
+
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
@@ -56,9 +58,9 @@ author = 'jazzband'
 # built documents.
 #
 # The short X.Y version.
-version = '4.2.0'
+version = axes.get_version()
 # The full version, including alpha/beta/rc tags.
-release = '4.2.0'
+release = axes.get_version()
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.