diff --git a/package-lock.json b/package-lock.json
index 9d228e7..b90be91 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -176,11 +176,11 @@
       "integrity": "sha512-5W8NUaFRFRqTOL7ZDDrx5qWHJyBXy6velVudIzQUSoqAAYqzSh2Z7/m0Rf1QbmQJccegD0r+YZxBjzqoBiEeJQ==",
       "dev": true,
       "requires": {
-        "core-js": "2.3.0",
-        "es6-promise": "3.0.2",
-        "lie": "3.1.1",
-        "pako": "1.0.6",
-        "readable-stream": "2.0.6"
+        "core-js": "~2.3.0",
+        "es6-promise": "~3.0.2",
+        "lie": "~3.1.0",
+        "pako": "~1.0.2",
+        "readable-stream": "~2.0.6"
       }
     },
     "lie": {