diff --git a/package-lock.json b/package-lock.json
index 1848a73..5c08d3c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -148,14 +148,14 @@
       "requires": {
         "component-emitter": "1.2.1",
         "component-inherit": "0.0.3",
-        "debug": "3.1.0",
-        "engine.io-parser": "2.1.3",
+        "debug": "~3.1.0",
+        "engine.io-parser": "~2.1.1",
         "has-cors": "1.1.0",
         "indexof": "0.0.1",
         "parseqs": "0.0.5",
         "parseuri": "0.0.5",
-        "ws": "6.1.4",
-        "xmlhttprequest-ssl": "1.5.5",
+        "ws": "~6.1.0",
+        "xmlhttprequest-ssl": "~1.5.4",
         "yeast": "0.1.2"
       }
     },