diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4e3b82dde..56f2e1c59 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fixed an issue with the `TavusVideoService` where an error was thrown due to
   missing transcription callbacks.
 
+- Fixed an issue in `SpeechmaticsSTTService` where the `user_id` was set to
+  `None` when diarization is not enabled.
+
 ### Performance
 
 - Fixed an issue in `TaskObserver` (a proxy to all observers) that was degrading