diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6725826c..159d1605 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 All notable changes to the LaunchDarkly Python SDK will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org).
 
+## [6.12.1] - 2020-02-12
+### Fixed:
+- When diagnostic events are enabled (as they are by default), the SDK was logging spurious warning messages saying "Unhandled exception in event processor. Diagnostic event was not sent. ['DiagnosticEventSendTask' object has no attribute '_response_fn']". The events were still being sent; the misleading message has been removed.
+
 ## [6.12.0] - 2020-02-11
 Note: if you are using the LaunchDarkly Relay Proxy to forward events, update the Relay to version 5.10.0 or later before updating to this Python SDK version.
 
diff --git a/ldclient/version.py b/ldclient/version.py
index 2ca4241c..457cadd5 100644
--- a/ldclient/version.py
+++ b/ldclient/version.py
@@ -1 +1 @@
-VERSION = "6.12.0"
+VERSION = "6.12.1"