diff --git a/deps/npm/node_modules/psl/package.json b/deps/npm/node_modules/psl/package.json
index ee2da19fa2d6..1a50ca384101 100644
--- a/deps/npm/node_modules/psl/package.json
+++ b/deps/npm/node_modules/psl/package.json
@@ -39,6 +39,6 @@
     "phantomjs-prebuilt": "^2.1.16",
     "request": "^2.88.2",
     "uglify-js": "^3.8.0",
-    "watchify": "^3.11.1"
+    "watchify": "^4.0.0"
   }
 }