diff --git a/gradle.properties b/gradle.properties
index 93b72e5d..e85a6eec 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,5 +1,5 @@
 name = RingoJS
-version = 3.1.0
+version = 4.0.0
 description = RingoJS is a JavaScript platform built on the JVM and optimized for server-side applications.
 url = https://ringojs.org/
 groupId = org.ringojs
diff --git a/src/org/ringojs/engine/RhinoEngine.java b/src/org/ringojs/engine/RhinoEngine.java
index fd9bec0a..21fa9147 100644
--- a/src/org/ringojs/engine/RhinoEngine.java
+++ b/src/org/ringojs/engine/RhinoEngine.java
@@ -76,7 +76,7 @@ public class RhinoEngine implements ScopeProvider {
     private static final Logger log = Logger.getLogger(RhinoEngine.class.getName());
 
     public static final List<Integer> VERSION =
-            Collections.unmodifiableList(Arrays.asList(3, 1, 0));
+            Collections.unmodifiableList(Arrays.asList(4, 0, 0));
 
     /**
      * Create a RhinoEngine with the given configuration. If <code>globals</code>