diff --git a/CHANGELOG.md b/CHANGELOG.md
index 33785ca..4b9d1ce 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
-## Changelog
+# Changelog
+
 --------------------------------------------
+[0.3.3]
+
+* Use SentObject instead of map.
+
 [0.3.2]
 
 * Fix compile error in case insensitive system. Thanks to @niceice220
diff --git a/pubspec.yaml b/pubspec.yaml
index 7bc4752..deeb34b 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: protoo_client
-version: 0.3.2
+version: 0.3.3
 description: Dart version of the protoo-client library.
 homepage: https://github.com/cloudwebrtc/dart-protoo-client
 environment: