diff --git a/src/services/shims.ts b/src/services/shims.ts
index 110090daf5c..d0feaf4bb1f 100644
--- a/src/services/shims.ts
+++ b/src/services/shims.ts
@@ -869,4 +869,4 @@ module TypeScript.Services {
 }
 
 /* @internal */
-let toolsVersion = "1.4";
+const toolsVersion = "1.5";