diff --git a/.travis.yml b/.travis.yml
index 6f7f411..8f3de76 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,7 @@
 language: node_js
 node_js:
-  - 0.10
-  - 0.12
-  - 4.1
+  - 6
+  - lts/*
   - stable
 
 notifications:
diff --git a/package.json b/package.json
index 7c6fbda..d110037 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,7 @@
     "cog": "^1.0.0",
     "debug": "^2.0.0",
     "rtc-switch": "^1.3.0",
-    "ws": "^1.0.0"
+    "ws": ">=3.3.1"
   },
   "devDependencies": {
     "async": "^0.9.0",
@@ -46,7 +46,7 @@
     "whisk": "^1.0.0"
   },
   "optionalDependencies": {
-    "bufferutil": "^1.2.1",
-    "utf-8-validate": "^1.2.1"
+    "bufferutil": "^4.0.1",
+    "utf-8-validate": "^5.0.2"
   }
 }
\ No newline at end of file