diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1bb1c6ab3a6..71f6a1f10a8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,10 @@
 Change Log
 ===
 
+v2.6.0-dev.1
+---
+* Upgrade TypeScript compiler to `v1.7.0-dev.20150924`
+
 v2.5.0
 ---
 * Use TypeScript compiler `v1.6.2`
diff --git a/package.json b/package.json
index a18ff5d8652..f7e5a2450ab 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "tslint",
-  "version": "2.5.0",
+  "version": "2.6.0-dev.1",
   "description": "a static analysis linter for TypeScript",
   "bin": {
     "tslint": "./bin/tslint"
diff --git a/src/tslint.ts b/src/tslint.ts
index 8863dc74dd8..65870b07481 100644
--- a/src/tslint.ts
+++ b/src/tslint.ts
@@ -33,7 +33,7 @@ module Lint {
     }
 
     export class Linter {
-        public static VERSION = "2.5.0";
+        public static VERSION = "2.6.0-dev.1";
 
         private fileName: string;
         private source: string;