diff --git a/package.json b/package.json
index d80506f..24a29d4 100644
--- a/package.json
+++ b/package.json
@@ -52,7 +52,7 @@
     "es6-promise": "^3.0.2",
     "lodash.defaults": "^3.1.2",
     "minimatch": "^3.0.0",
-    "ps-tree": "~0.0.3",
+    "ps-tree": "^1.0.1",
     "touch": "1.0.0",
     "undefsafe": "0.0.3",
     "update-notifier": "0.5.0"