diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
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@@ -1,3 +1,8 @@
+### 0.12.1 March 23 2022 ####
+
+* Fix disallow-unsafe-type Akka.NET settings and harden unsafe type detection [301](https://github.com/akkadotnet/Hyperion/pull/301)
+* Bump [Akka version from 1.4.34 to 1.4.35](https://github.com/akkadotnet/akka.net/releases/tag/1.4.35)
+
 ### 0.12.0 January 12 2022 ####
 
 * Allow explicit control over which types can be deserialized [#281](https://github.com/akkadotnet/Hyperion/pull/281)