diff --git a/build.gradle b/build.gradle
index 6d6dcb5d..eeadf8ec 100644
--- a/build.gradle
+++ b/build.gradle
@@ -42,7 +42,7 @@ allprojects {
     targetCompatibility = 1.8
 
     group 'org.nervos.ckb'
-    version '3.0.0'
+    version '2.2.0'
     apply plugin: 'java'
 
     repositories {
@@ -105,7 +105,7 @@ configure(subprojects.findAll { it.name != 'tests' }) {
         publications {
             mavenJava(MavenPublication) {
                 groupId 'org.nervos.ckb'
-                version '3.0.0'
+                version '2.2.0'
                 from components.java
 
                 pom {
diff --git a/light-client/build.gradle b/light-client/build.gradle
index 84ae1aa4..07ee9dd4 100644
--- a/light-client/build.gradle
+++ b/light-client/build.gradle
@@ -4,7 +4,7 @@ plugins {
 }
 
 group 'org.nervos.ckb'
-version '2.1.1'
+version '2.2.0'
 
 repositories {
     mavenCentral()