diff --git a/package.json b/package.json
index f0698ca..067347d 100644
--- a/package.json
+++ b/package.json
@@ -17,9 +17,11 @@
     "test": "test"
   },
   "dependencies": {
-    "knockout": "3.4.0",
     "weakmap": "0.0.6"
   },
+  "peerDependencies": {
+    "knockout": ">=2.2.0"
+  },
   "devDependencies": {
     "grunt": "0.4.5",
     "grunt-browserify": "latest",