diff --git a/CHANGELOG.md b/CHANGELOG.md
index bf727c87..4caff48b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,8 @@
 # Changelog
+## [1.4.3] - 2024-01-30
+### New
+- Added `etherspotBundlerApiKey` optional parameter in SdkOptions for use of predefined mainnet bundlers
+
 ## [1.4.2] - 2024-01-26
 ### Breaking changes
 - Refactored `estimate` method
diff --git a/package-lock.json b/package-lock.json
index eb854407..e3a6e62c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@etherspot/prime-sdk",
-  "version": "1.4.1",
+  "version": "1.5.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@etherspot/prime-sdk",
-      "version": "1.4.1",
+      "version": "1.5.1",
       "license": "MIT",
       "dependencies": {
         "@apollo/client": "3.8.7",
diff --git a/package.json b/package.json
index 1b4ec2d4..cafc63bc 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@etherspot/prime-sdk",
-  "version": "1.5.0",
+  "version": "1.5.1",
   "description": "Etherspot Prime (Account Abstraction) SDK",
   "keywords": [
     "ether",