diff --git a/packages/protons-runtime/CHANGELOG.md b/packages/protons-runtime/CHANGELOG.md
index c3cd993..676f53d 100644
--- a/packages/protons-runtime/CHANGELOG.md
+++ b/packages/protons-runtime/CHANGELOG.md
@@ -1,3 +1,14 @@
+## [protons-runtime-v4.0.0](https://github.com/ipfs/protons/compare/protons-runtime-v3.1.0...protons-runtime-v4.0.0) (2022-10-12)
+
+
+### ⚠ BREAKING CHANGES
+
+* ts definitions will need to be generated from `.proto` files - singular message fields have become optional as message fields are always optional in proto3
+
+### Bug Fixes
+
+* adhere more closely to the language guide for proto3 default values ([#66](https://github.com/ipfs/protons/issues/66)) ([406d775](https://github.com/ipfs/protons/commit/406d7757d490eb0dbac93343d6622dd689ff0707)), closes [#43](https://github.com/ipfs/protons/issues/43)
+
 ## [protons-runtime-v3.1.0](https://github.com/ipfs/protons/compare/protons-runtime-v3.0.1...protons-runtime-v3.1.0) (2022-08-11)
 
 
diff --git a/packages/protons-runtime/package.json b/packages/protons-runtime/package.json
index 0f652b9..e56b823 100644
--- a/packages/protons-runtime/package.json
+++ b/packages/protons-runtime/package.json
@@ -1,6 +1,6 @@
 {
   "name": "protons-runtime",
-  "version": "3.1.0",
+  "version": "4.0.0",
   "description": "Shared code to make your bundle smaller when running protons in your app",
   "license": "Apache-2.0 OR MIT",
   "homepage": "https://github.com/ipfs/protons/tree/master/packages/protons-runtime#readme",