diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5cc6323..ab06747 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,7 +3,7 @@
 All notable changes to this project will be documented in this file.
 See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
 
-# [4.12.3]() (Upcoming)
+# [4.12.4]() (Upcoming)
 
 ### Bug Fixes
 
@@ -17,6 +17,20 @@ See [Conventional Commits](https://conventionalcommits.org) for commit guideline
 
 *
 
+# [4.12.3](https://github.com/web3j/web3j-gradle-plugin/releases/tag/v4.12.3) (2024-12-23)
+
+### Bug Fixes
+
+*
+
+### Features
+
+*  Upgrade to Web3j 4.12.3 and release web3j gradle plugin 4.12.3 [#93](https://github.com/hyperledger-web3j/web3j-gradle-plugin/pull/93)
+
+### BREAKING CHANGES
+
+*
+
 # [4.12.2](https://github.com/web3j/web3j-gradle-plugin/releases/tag/v4.12.2) (2024-09-19)
 
 ### Bug Fixes
diff --git a/build.gradle b/build.gradle
index f246fe3..79f5512 100644
--- a/build.gradle
+++ b/build.gradle
@@ -26,7 +26,7 @@ apply {
         'junit'
     ].each { buildScript ->
         download {
-            src "https://raw.githubusercontent.com/hyperledger/web3j-build-tools/main/gradle/$buildScript/build.gradle"
+            src "https://raw.githubusercontent.com/hyperledger-web3j/web3j-build-tools/main/gradle/$buildScript/build.gradle"
             dest "$rootDir/gradle/$buildScript/build.gradle"
             overwrite true
             quiet true
@@ -64,7 +64,7 @@ dependencies {
 
 gradlePlugin {
     website = 'https://web3j.io/'
-    vcsUrl = 'https://github.com/hyperledger/web3j-gradle-plugin'
+    vcsUrl = 'https://github.com/hyperledger-web3j/web3j-gradle-plugin'
     plugins {
         web3j {
             description = 'Gradle plugin providing tasks to generate web3j contracts from Solidity.'
diff --git a/gradle.properties b/gradle.properties
index 0f31dca..ab8881f 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,6 +1,6 @@
 group=org.web3j
-version=4.12.2
+version=4.12.3
 org.gradle.caching=true
 org.gradle.parallel=true
-solidityPluginVersion=0.5.1
+solidityPluginVersion=0.5.2
 kotlinVersion=1.9.24
diff --git a/gradle/spotless/build.gradle b/gradle/spotless/build.gradle
index 4364b4b..2875c77 100644
--- a/gradle/spotless/build.gradle
+++ b/gradle/spotless/build.gradle
@@ -3,14 +3,14 @@ apply plugin: 'com.diffplug.spotless'
 apply plugin: "de.undercouch.download"
 
 task downloadJavaLicense(type: Download) {
-    src 'https://raw.githubusercontent.com/hyperledger/web3j-build-tools/main/gradle/spotless/java.license'
+    src 'https://raw.githubusercontent.com/hyperledger-web3j/web3j-build-tools/main/gradle/spotless/java.license'
     dest new File("$rootDir/gradle/spotless",'java.license')
     quiet true
     onlyIfModified true
 }
 
 task downloadFormatterProperties(type: Download) {
-    src 'https://raw.githubusercontent.com/hyperledger/web3j-build-tools/main/gradle/spotless/formatter.properties'
+    src 'https://raw.githubusercontent.com/hyperledger-web3j/web3j-build-tools/main/gradle/spotless/formatter.properties'
     dest new File("$rootDir/gradle/spotless",'formatter.properties')
     quiet true
     onlyIfModified true