diff --git a/.circleci/config.yml b/.circleci/config.yml
index 981154f..e01a663 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -44,6 +44,11 @@ jobs:
           command: |
             npm install --no-save typescript@2.4
             npm test
+      - run:
+          name: Test with TypeScript 2.5
+          command: |
+            npm install --no-save typescript
+            npm test
       - save_cache:
           key: v{{ .Environment.CIRCLE_CACHE_VERSION }}-npm-lock-{{ .Branch }}-{{ .Environment.CIRCLE_JOB }}-{{ checksum "package-lock.json" }}
           paths:
diff --git a/appveyor.yml b/appveyor.yml
index 18d3f47..e8b4c7f 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -26,6 +26,8 @@ test_script:
   - npm test
   - npm install --no-save typescript@2.4
   - npm test
+  - npm install --no-save typescript
+  - npm test
 
 # Don't actually build.
 build: off
diff --git a/package-lock.json b/package-lock.json
index 4a661e5..fb55334 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,13 +1,13 @@
 {
   "name": "typescript-simple",
-  "version": "8.0.3",
+  "version": "8.0.4-rc.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
     "@types/node": {
-      "version": "4.2.16",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-4.2.16.tgz",
-      "integrity": "sha512-goVnbj0oGmXXGYjXviARHjgxj/rEyizBy3q0kYI/kb1yKDVaNrj0/vaFcYzfBQvFEbd3K+1SNru432et3/ys6w==",
+      "version": "4.2.20",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-4.2.20.tgz",
+      "integrity": "sha512-nSLKvYxEIV2bBlWvvpas2z7tKkg2qfkx2BdotvL1rkhbStlijGajd9+db8fghja1citNOa9cOVn20JQ6ImP9tg==",
       "dev": true
     },
     "balanced-match": {
@@ -270,9 +270,9 @@
       }
     },
     "typescript": {
-      "version": "2.4.2",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-2.4.2.tgz",
-      "integrity": "sha1-+DlfhdRZJ2BnyYiqQYN6j4KHCEQ="
+      "version": "2.5.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-2.5.2.tgz",
+      "integrity": "sha1-A4qV99m7tCCxvzW6MdTFwd0//jQ="
     },
     "wrappy": {
       "version": "1.0.2",
diff --git a/package.json b/package.json
index bac7e20..20c27b6 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "typescript-simple",
   "description": "Simple API to compile TypeScript code string to JavaScript. That's all!",
-  "version": "8.0.3",
+  "version": "8.0.4-rc.0",
   "author": "Teppei Sato <teppeis@gmail.com>",
   "engines": {
     "node": ">=4"
@@ -13,10 +13,10 @@
     "test": "npm run prepare && mocha"
   },
   "dependencies": {
-    "typescript": "^2.4.2"
+    "typescript": "^2.2.1"
   },
   "devDependencies": {
-    "@types/node": "^4.2.16",
+    "@types/node": "^4.2.20",
     "mocha": "^3.1.2"
   },
   "homepage": "https://github.com/teppeis/typescript-simple",
diff --git a/tsconfig.json b/tsconfig.json
index eb4476d..b1e629d 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -3,7 +3,7 @@
         "target": "es5",
         "module": "commonjs",
         "lib": [
-            "ES6"
+            "es6"
         ],
         "declaration": true,
         "removeComments": false,