diff --git a/build.sbt b/build.sbt
index f31d2cd..603c167 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,6 +1,6 @@
 val Organization = "gitbucket"
 val Name = "gitbucket"
-val GitBucketVersion = "3.14.0-SNAPSHOT"
+val GitBucketVersion = "4.0.0-SNAPSHOT"
 val ScalatraVersion = "2.4.0"
 val JettyVersion = "9.3.6.v20151106"
 
diff --git a/doc/release.md b/doc/release.md
index 98ba383..d677a26 100644
--- a/doc/release.md
+++ b/doc/release.md
@@ -11,22 +11,24 @@
 ```scala
 val Organization = "gitbucket"
 val Name = "gitbucket"
-val GitBucketVersion = "3.12.0" // <---- update version!!
+val GitBucketVersion = "4.0.0" // <---- update version!!
 val ScalatraVersion = "2.4.0"
 val JettyVersion = "9.3.6.v20151106"
 ```
 
-### src/main/scala/gitbucket/core/servlet/AutoUpdate.scala
+### src/main/scala/gitbucket/core/GitBucketCoreModule.scala
 
 ```scala
-object AutoUpdate {
-
-  /**
-   * The history of versions. A head of this sequence is the current GitBucket version.
-   */
-  val versions = Seq(
-    new Version(3, 12), // <---- add this line!!
-    new Version(3, 11),
+object GitBucketCoreModule extends Module("gitbucket-core",
+  // add new version definition
+  new Version("4.1.0",
+    new LiquibaseMigration("update/gitbucket-core_4.1.xml")
+  ),
+  new Version("4.0.0",
+    new LiquibaseMigration("update/gitbucket-core_4.0.xml"),
+    new SqlMigration("update/gitbucket-core_4.0.sql")
+  )
+)
 ```
 
 Generate release files