diff --git a/CHANGES.md b/CHANGES.md
index b46236e..484bc20 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,6 @@
+### 0.9.1
+- Fixed an issue where `worker.refresh()` may fail when upgrading from previous versions of RQ.
+
 ### 0.9.0
 - `Worker` statistics! `Worker` now keeps track of `last_heartbeat`, `successful_job_count`, `failed_job_count` and `total_working_time`. Thanks @selwin!
 - `Worker` now sends heartbeat during suspension check. Thanks @theodesp!
diff --git a/rq/version.py b/rq/version.py
index 1a9b51b..f0c04ac 100644
--- a/rq/version.py
+++ b/rq/version.py
@@ -2,4 +2,4 @@
 from __future__ import (absolute_import, division, print_function,
                         unicode_literals)
 
-VERSION = '0.9.0'
+VERSION = '0.9.1'