diff --git a/CHANGELOG.md b/CHANGELOG.md
index f20f87d..7730ae3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,8 @@
 x.y.z / 2014-06-dd
 ------------------
 - removed semicolons per http://cryptocoinjs.com/about/contributing/#semicolons
-- 
+- removed `ECKey` dep
+- added `ecurve` dep
 
 0.0.1 / 2014-05-29
 ------------------
diff --git a/lib/hdkey.js b/lib/hdkey.js
index 49ee46e..5f0cf5c 100644
--- a/lib/hdkey.js
+++ b/lib/hdkey.js
@@ -1,8 +1,9 @@
-var sha512 = require('sha512')
-var ECKey = require('eckey')
-var BigInteger = require('bigi')
-var crypto = require('crypto')
 var assert = require('assert')
+var crypto = require('crypto')
+var BigInteger = require('bigi')
+var ecurve = require('ecurve')
+var ecparams = ecurve.getCurveByName('secp256k1')
+var sha512 = require('sha512')
 
 module.exports = HDKey
 
@@ -11,7 +12,8 @@ var HARDENED_OFFSET = 0x80000000
 var LEN = 78
 
 //I hate that this is hardcoded, but for now...
-var N = BigInteger.fromHex("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141")
+//var N = BigInteger.fromHex("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141")
+var N = ecparams.params.n
 
 //Bitcoin hardcoded by default, can use package `coininfo` for others
 var VERSIONS = {private: 0x0488ADE4, public: 0x0488B21E}
@@ -24,8 +26,8 @@ function HDKey(seed) {
   var IL = I.slice(0, 32)
   var IR = I.slice(32)
 
-  this.priv = new ECKey(IL, true)
-  this.pub = this.priv.publicPoint
+  setPrivPub(this, IL)
+
   this.chaincode = IR
   this.depth = 0
   this.index = 0
@@ -60,7 +62,7 @@ Object.defineProperty(HDKey.prototype, 'private', {
 
     // 0x00 + k for private keys
     buffer.writeUInt8(0, 45)
-    this.priv.privateKey.copy(buffer, 46)
+    this.priv.copy(buffer, 46)
 
 
     return buffer
@@ -150,7 +152,7 @@ HDKey.prototype.deriveChild = function(index) {
   if (isHardened) {
     assert(this.priv, 'Could not derive hardened child key')
 
-    var pk = this.priv.privateKey
+    var pk = this.priv
     var zb = new Buffer([0])
     pk = Buffer.concat([zb, pk])
 
@@ -178,15 +180,16 @@ HDKey.prototype.deriveChild = function(index) {
   // Private parent key -> private child key
   if (this.priv) {
     // ki = parse256(IL) + kpar (mod n)
-    var ki = pIL.add(BigInteger.fromBuffer(this.priv.privateKey)).mod(N)
+    var ki = pIL.add(BigInteger.fromBuffer(this.priv)).mod(N)
 
     // In case parse256(IL) >= n or ki == 0, one should proceed with the next value for i
     if (pIL.compareTo(N) >= 0 || ki.signum() === 0) {
       return this.derive(index + 1)
     }
 
-    hd.priv = new ECKey(ki.toBuffer(), true)
-    hd.pub = hd.priv.publicPoint
+    //hd.priv = new ECKey(ki.toBuffer(), true)
+    //hd.pub = hd.priv.publicPoint
+    setPrivPub(hd, ki.toBuffer())
 
   // Public parent key -> public child key
   } else {
@@ -208,4 +211,11 @@ HDKey.prototype.deriveChild = function(index) {
   hd.index = index
 
   return hd
+}
+
+//temporary
+function setPrivPub(hd, privKey) {
+  hd.priv = privKey
+  hd.compressed = true
+  hd.pub = ecparams.params.G.multiply(BigInteger.fromBuffer(privKey))
 }
\ No newline at end of file
diff --git a/package.json b/package.json
index 0b288f0..0b24e07 100644
--- a/package.json
+++ b/package.json
@@ -30,8 +30,8 @@
   },
   "dependencies": {
     "sha512": "0.0.1",
-    "eckey": "^0.4.2",
-    "bigi": "^1.1.0"
+    "bigi": "^1.1.0",
+    "ecurve": "^0.8.0"
   },
   "scripts": {
     "unit": "./node_modules/.bin/mocha",