diff --git a/CHANGES.rst b/CHANGES.rst
index 960c748..f3f9aaf 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -2,6 +2,12 @@
 CHANGELOG
 =========
 
+0.3.5 (2019-01-21)
+------------------
+
+* Remove unused reference to ``cStringIO``.
+
+
 0.3.4 (2017-07-07)
 ------------------
 
diff --git a/rattail_cognitive/_version.py b/rattail_cognitive/_version.py
index 70d2ced..6afd4d9 100644
--- a/rattail_cognitive/_version.py
+++ b/rattail_cognitive/_version.py
@@ -1,3 +1,3 @@
 # -*- coding: utf-8; -*-
 
-__version__ = '0.3.4'
+__version__ = '0.3.5'