diff --git a/CHANGELOG.md b/CHANGELOG.md
index fdd8661..76a90c8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+### v0.3.0 / 2021-03-02
+
+* ADDED: Require Ruby 2.5 or later
+* FIXED: Deep-duplicated event attributes in to_h to avoid returning frozen objects 
+
 ### v0.2.0 / 2021-01-25
 
 * ADDED: Freeze event objects to make them Ractor-shareable
diff --git a/lib/cloud_events/version.rb b/lib/cloud_events/version.rb
index 21ee081..40e29c8 100644
--- a/lib/cloud_events/version.rb
+++ b/lib/cloud_events/version.rb
@@ -5,5 +5,5 @@ module CloudEvents
   # Version of the Ruby CloudEvents SDK
   # @return [String]
   #
-  VERSION = "0.2.0"
+  VERSION = "0.3.0"
 end