diff --git a/.pubnub.yml b/.pubnub.yml
index 6ec06587..736e780f 100644
--- a/.pubnub.yml
+++ b/.pubnub.yml
@@ -3,6 +3,13 @@ schema: 1
 version: "4.9.0"
 scm: github.com/pubnub/c-core
 changelog:
+  - date: 2024-03-26
+    version: v4.9.1
+    changes:
+      - type: bug
+        text: "Fix too small amount of memory allocated for aes cbc algorithm in some cases."
+      - type: improvement
+        text: "Add possibility to include address sanitizer in build via CMake."
   - date: 2024-01-08
     version: v4.9.0
     changes:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 30a54d0f..0af13f52 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,12 @@
+## v4.9.1
+March 26 2024
+
+#### Fixed
+- Fix too small amount of memory allocated for aes cbc algorithm in some cases.
+
+#### Modified
+- Add possibility to include address sanitizer in build via CMake.
+
 ## v4.9.0
 January 08 2024