diff --git a/package.json b/package.json
index 968e1f1..dccf4a1 100644
--- a/package.json
+++ b/package.json
@@ -9,17 +9,17 @@
   ],
   "author": "Bill Casarin <bill@casarin.ca> (jb55.com)",
   "dependencies": {
-    "underscore": ">= 1.0.3"
+    "underscore": "1.3.x"
   },
   "repository": {
     "type": "git",
     "url": "git://github.com/jb55/node-bitcoin.git"
   },
   "devDependencies": {
-    "vows": "*"
+    "vows": "0.6.x"
   },
   "engines": {
-    "node": "*"
+    "node": ">=0.2.6"
   },
   "scripts": {
     "test": "node test/api.js"