diff --git a/package.json b/package.json
index ec974ef..e686b13 100644
--- a/package.json
+++ b/package.json
@@ -38,7 +38,7 @@
     "gulp-istanbul": "^1.1.1",
     "gulp-load-plugins": "^1.3.0",
     "gulp-mocha": "^3.0.1",
-    "gulp-sourcemaps": "^1.6.0",
+    "gulp-sourcemaps": "^1.9.0",
     "gulp-standard": "^7.0.1",
     "in-publish": "^2.0.0",
     "isparta": "^4.0.0",