diff --git a/CHANGELOG.md b/CHANGELOG.md
index a684ac02..f5e6048d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,12 @@
-# Changelog
+ # Changelog
+
+## [0.3.15](https://github.com/a2aproject/a2a-python/compare/v0.3.14...v0.3.15) (2025-11-19)
+
+
+### Features
+
+* Add client-side extension support ([#525](https://github.com/a2aproject/a2a-python/issues/525)) ([9a92bd2](https://github.com/a2aproject/a2a-python/commit/9a92bd238e7560b195165ac5f78742981760525e))
+* **rest, jsonrpc:** Add client-side extension support ([9a92bd2](https://github.com/a2aproject/a2a-python/commit/9a92bd238e7560b195165ac5f78742981760525e))
 
 ## [0.3.14](https://github.com/a2aproject/a2a-python/compare/v0.3.13...v0.3.14) (2025-11-17)