diff --git a/APIKit.podspec b/APIKit.podspec
index 66f1c988..4a32f309 100644
--- a/APIKit.podspec
+++ b/APIKit.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name     = "APIKit"
-  s.version  = "3.2.1"
+  s.version  = "4.0.0"
   s.summary  = "Type-safe networking abstraction layer that associates request type with response type."
   s.homepage = "https://github.com/ishkawa/APIKit"
 
diff --git a/Sources/APIKit/Info.plist b/Sources/APIKit/Info.plist
index d53476e7..0e9f1f71 100644
--- a/Sources/APIKit/Info.plist
+++ b/Sources/APIKit/Info.plist
@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>FMWK</string>
 	<key>CFBundleShortVersionString</key>
-	<string>3.1.2</string>
+	<string>4.0.0</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>