diff --git a/README.md b/README.md
index 2d385d4..c03935d 100644
--- a/README.md
+++ b/README.md
@@ -15,10 +15,10 @@ repositories {
 }
 
 dependencies {
-    compile 'com.github.k-kagurazaka.rx-property-android:rx-property:3.1.0'
+    compile 'com.github.k-kagurazaka.rx-property-android:rx-property:4.0.0'
 
     // If you want to use Kotlin syntax
-    compile 'com.github.k-kagurazaka.rx-property-android:rx-property-kotlin:3.1.0'
+    compile 'com.github.k-kagurazaka.rx-property-android:rx-property-kotlin:4.0.0'
 }
 ```
 
diff --git a/gradle.properties b/gradle.properties
index a155629..a327491 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,2 +1,2 @@
 GROUP=com.github.k-kagurazaka
-VERSION_NAME=3.1.0
+VERSION_NAME=4.0.0