diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9bf23a9af8..9ffa5b1ff1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+# [4.21.0](https://github.com/contentful/ui-extensions-sdk/compare/v4.20.0...v4.21.0) (2023-06-22)
+
+### Features
+
+- adds optional types for parameters [EXT-4381] ([#1538](https://github.com/contentful/ui-extensions-sdk/issues/1538)) ([7cbad71](https://github.com/contentful/ui-extensions-sdk/commit/7cbad718111ba830b0c75921c06bfae437515411))
+
 # [4.20.0](https://github.com/contentful/ui-extensions-sdk/compare/v4.19.1...v4.20.0) (2023-06-22)
 
 ### Features
diff --git a/package-lock.json b/package-lock.json
index 6382b57f57..8cbb6dec6c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "contentful-ui-extensions-sdk",
-  "version": "4.20.0",
+  "version": "4.21.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "contentful-ui-extensions-sdk",
-      "version": "4.20.0",
+      "version": "4.21.0",
       "license": "MIT",
       "dependencies": {
         "contentful-management": ">=7.30.0"
diff --git a/package.json b/package.json
index 3040f020fe..03c11a7d32 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "contentful-ui-extensions-sdk",
   "description": "A JavaScript library to develop custom apps for Contentful",
-  "version": "4.20.0",
+  "version": "4.21.0",
   "author": "Contentful GmbH",
   "license": "MIT",
   "sideEffects": true,