diff --git a/package.json b/package.json
index 540f97f..bd37183 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "pngjs2",
-  "version": "0.0.3",
+  "version": "1.0.0",
   "description": "PNG encoder/decoder in pure JS, supporting any bit size & interlace, async & sync with full test suite.",
   "contributors": [
     "Alexandre Paré",
@@ -25,7 +25,8 @@
     "pngjs"
   ],
   "engines": {
-    "node": "0.10.x"
+    "node": ">=0.10.0",
+    "iojs": ">= 1.0.0"
   },
   "main": "./lib/png.js",
   "directories": {