diff --git a/.travis.yml b/.travis.yml
index 93b05ba..c80397c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,13 +4,13 @@ os:
 language: generic
 sudo: required
 dist: trusty
-osx_image: xcode9.2
+osx_image: xcode9.3beta
 install:
 - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
     eval "$(curl -sL https://gist.githubusercontent.com/kylef/5c0475ff02b7c7671d2a/raw/9f442512a46d7a2af7b850d65a7e9bd31edfb09b/swiftenv-install.sh)";
-    swiftenv install 4.0.3;
-    swiftenv global 4.0.3;
-    export LD_LIBRARY_PATH=$HOME/.swiftenv/versions/4.0.3/usr/lib/swift/linux:$LD_LIBRARY_PATH;
+    swiftenv install 4.1;
+    swiftenv global 4.1;
+    export LD_LIBRARY_PATH=$HOME/.swiftenv/versions/4.1/usr/lib/swift/linux:$LD_LIBRARY_PATH;
   fi
 - swift --version
 script:
diff --git a/Package.resolved b/Package.resolved
index 31995f2..fe5f7b6 100644
--- a/Package.resolved
+++ b/Package.resolved
@@ -6,8 +6,8 @@
         "repositoryURL": "https://github.com/yanagiba/bocho",
         "state": {
           "branch": null,
-          "revision": "411fb57fe99824ebe8f107c69cf61fc8bc68853d",
-          "version": "0.1.1"
+          "revision": "997bd2aa557e39a284afc3245989aa006b0f28fa",
+          "version": "0.1.2"
         }
       },
       {
@@ -15,8 +15,8 @@
         "repositoryURL": "https://github.com/yanagiba/swift-ast",
         "state": {
           "branch": null,
-          "revision": "95850381045b0386a3c4b18f8bf2af929da48398",
-          "version": null
+          "revision": "a3f4734b38216f78c51c370f10851eef8ae81450",
+          "version": "0.4.2"
         }
       }
     ]
diff --git a/Package.swift b/Package.swift
index 656e9b3..4130467 100644
--- a/Package.swift
+++ b/Package.swift
@@ -37,11 +37,11 @@ let package = Package(
   dependencies: [
     .package(
       url: "https://github.com/yanagiba/swift-ast",
-      .revision("95850381045b0386a3c4b18f8bf2af929da48398")
+      .exact("0.4.2")
     ),
     .package(
       url: "https://github.com/yanagiba/bocho",
-      .exact("0.1.1")
+      .exact("0.1.2")
     ),
   ],
   targets: [
diff --git a/README.md b/README.md
index ee18f43..3d63227 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@
 
 [![Travis CI Status](https://api.travis-ci.org/yanagiba/swift-transform.svg?branch=master)](https://travis-ci.org/yanagiba/swift-transform)
 [![codecov](https://codecov.io/gh/yanagiba/swift-transform/branch/master/graph/badge.svg)](https://codecov.io/gh/yanagiba/swift-transform)
-![Swift 4.0](https://img.shields.io/badge/swift-4.0-brightgreen.svg)
+![Swift 4.1](https://img.shields.io/badge/swift-4.1-brightgreen.svg)
 ![Swift Package Manager](https://img.shields.io/badge/SPM-ready-orange.svg)
 ![Platforms](https://img.shields.io/badge/platform-%20Linux%20|%20macOS%20-red.svg)
 ![License](https://img.shields.io/github/license/yanagiba/swift-transform.svg)
@@ -28,7 +28,7 @@ Please also check out the [status](https://github.com/yanagiba/swift-ast#a-work-
 
 ## Requirements
 
-- [Swift 4.0](https://swift.org/download/)
+- [Swift 4.1](https://swift.org/download/)
 
 ## Development