diff --git a/package.json b/package.json
index 1734e24..cd84045 100644
--- a/package.json
+++ b/package.json
@@ -42,7 +42,7 @@
     "compile": "./node_modules/.bin/browserify ./src/index.js -s Bitcoin | ./node_modules/.bin/uglifyjs > bitcoinjs-min.js"
   },
   "dependencies": {
-    "bigi": "0.2.0",
+    "bigi": "1.0.0",
     "crypto-js": "3.1.2-3",
     "secure-random": "0.2.1"
   }
diff --git a/src/base58.js b/src/base58.js
index f6f86a1..588ac84 100644
--- a/src/base58.js
+++ b/src/base58.js
@@ -5,7 +5,7 @@
 // Merged Buffer refactorings from base58-native by Stephen Pair
 // Copyright (c) 2013 BitPay Inc
 
-var BigInteger = require('./bigi')
+var BigInteger = require('bigi')
 
 var ALPHABET = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
 var ALPHABET_BUF = new Buffer(ALPHABET, 'ascii')
diff --git a/src/bigi.js b/src/bigi.js
deleted file mode 100644
index 118db69..0000000
--- a/src/bigi.js
+++ /dev/null
@@ -1,38 +0,0 @@
-var assert = require('assert')
-var BigInteger = require('bigi')
-
-// Import operations
-BigInteger.fromHex = function(hex) {
-  var buffer = new Buffer(hex, 'hex')
-  assert.equal(buffer.length, Buffer.byteLength(hex) / 2)
-
-  return BigInteger.fromBuffer(buffer)
-}
-
-BigInteger.fromBuffer = function(buffer) {
-  assert(Array.isArray(buffer) || Buffer.isBuffer(buffer)) // FIXME: Transitionary
-
-  // FIXME: Transitionary
-  if (Buffer.isBuffer(buffer)) {
-    buffer = Array.prototype.slice.call(buffer)
-  }
-
-  return BigInteger.fromByteArrayUnsigned(buffer)
-}
-
-// Export operations
-BigInteger.prototype.toBuffer = function(s) {
-  if (s != undefined) assert(Number.isFinite(s))
-
-  var buffer = new Buffer(this.toByteArrayUnsigned())
-  var padded = new Buffer(s - buffer.length)
-  padded.fill(0)
-
-  return Buffer.concat([padded, buffer], s)
-}
-
-BigInteger.prototype.toHex = function(s) {
-  return this.toBuffer(s).toString('hex')
-}
-
-module.exports = BigInteger
diff --git a/src/ec.js b/src/ec.js
index d06bf83..9f450f8 100644
--- a/src/ec.js
+++ b/src/ec.js
@@ -2,7 +2,7 @@
 // Ported loosely from BouncyCastle's Java EC code
 // Only Fp curves implemented for now
 
-var BigInteger = require('./bigi')
+var BigInteger = require('bigi')
 
 function ECFieldElementFp(q,x) {
     this.x = x;
diff --git a/src/ecdsa.js b/src/ecdsa.js
index 6175aae..451ba4b 100644
--- a/src/ecdsa.js
+++ b/src/ecdsa.js
@@ -3,7 +3,7 @@ var crypto = require('crypto')
 var sec = require('./sec')
 var ecparams = sec("secp256k1")
 
-var BigInteger = require('./bigi')
+var BigInteger = require('bigi')
 var ECPointFp = require('./ec').ECPointFp
 
 var P_OVER_FOUR = null
@@ -178,6 +178,8 @@ var ecdsa = {
    * }
    */
   parseSig: function (sig) {
+    if(Array.isArray(sig)) sig = new Buffer(sig);
+
     var cursor
     if (sig[0] != 0x30) {
       throw new Error("Signature not a valid DERSequence")
diff --git a/src/eckey.js b/src/eckey.js
index bb2b3a0..87d2934 100644
--- a/src/eckey.js
+++ b/src/eckey.js
@@ -10,7 +10,7 @@ var crypto = require('./crypto')
 var sec = require('./sec')
 var ecparams = sec('secp256k1')
 
-var BigInteger = require('./bigi')
+var BigInteger = require('bigi')
 var ECPointFp = require('./ec').ECPointFp
 
 function ECKey(D, compressed) {
diff --git a/src/hdwallet.js b/src/hdwallet.js
index 0840723..7a475cf 100644
--- a/src/hdwallet.js
+++ b/src/hdwallet.js
@@ -3,7 +3,7 @@ var base58 = require('./base58')
 var convert = require('./convert')
 
 var Address = require('./address')
-var BigInteger = require('./bigi')
+var BigInteger = require('bigi')
 var CJS = require('crypto-js')
 var crypto = require('./crypto')
 var ECKey = require('./eckey').ECKey
diff --git a/src/index.js b/src/index.js
index 81414e2..8d645d7 100644
--- a/src/index.js
+++ b/src/index.js
@@ -6,7 +6,6 @@ module.exports = {
   Address: require('./address'),
   base58: require('./base58'),
   base58check: require('./base58check'),
-  BigInteger: require('./bigi'),
   convert: require('./convert'),
   crypto: require('./crypto'),
   ec: ec,
diff --git a/src/sec.js b/src/sec.js
index 6aa9e6f..79bc51a 100644
--- a/src/sec.js
+++ b/src/sec.js
@@ -1,6 +1,6 @@
 // Named EC curves
 
-var BigInteger = require('./bigi')
+var BigInteger = require('bigi')
 var ECCurveFp = require('./ec')
 var ECPointFp = ECCurveFp.ECPointFp
 
diff --git a/src/transaction.js b/src/transaction.js
index 5470dcd..0fe3c28 100644
--- a/src/transaction.js
+++ b/src/transaction.js
@@ -2,7 +2,7 @@
 
 var assert = require('assert')
 var Address = require('./address')
-var BigInteger = require('./bigi')
+var BigInteger = require('bigi')
 var Script = require('./script')
 var convert = require('./convert')
 var crypto = require('./crypto')
diff --git a/test/bigi.js b/test/bigi.js
deleted file mode 100644
index 4df4aad..0000000
--- a/test/bigi.js
+++ /dev/null
@@ -1,46 +0,0 @@
-var assert = require('assert')
-var BigInteger = require('../').BigInteger
-
-var fixtures = require('./fixtures/bigi')
-
-describe('BigInteger', function() {
-  describe('fromBuffer/fromHex', function() {
-    it('should match the test vectors', function() {
-      fixtures.valid.forEach(function(f) {
-        assert.equal(BigInteger.fromHex(f.hex).toString(), f.dec)
-        assert.equal(BigInteger.fromHex(f.hexPadded).toString(), f.dec)
-      })
-    })
-
-    fixtures.invalid.forEach(function(f) {
-      it('throws on ' + f.description, function() {
-        assert.throws(function() {
-          BigInteger.fromHex(f.string)
-        })
-      })
-    })
-  })
-
-  describe('toBuffer/toHex', function() {
-    it('should match the test vectors', function() {
-      fixtures.valid.forEach(function(f) {
-        var bi = new BigInteger(f.dec)
-
-        assert.equal(bi.toHex(), f.hex)
-        assert.equal(bi.toHex(32), f.hexPadded)
-      })
-    })
-
-    it('throws on non-finite padding value', function() {
-        var bi = new BigInteger('1')
-
-        assert.throws(function() { bi.toHex({}) })
-        assert.throws(function() { bi.toHex([]) })
-        assert.throws(function() { bi.toHex('') })
-        assert.throws(function() { bi.toHex(0 / 0) })
-        assert.throws(function() { bi.toHex(1 / 0) })
-    })
-  })
-})
-
-module.exports = BigInteger
diff --git a/test/ec.js b/test/ec.js
index dc74cf3..c9fc3c8 100644
--- a/test/ec.js
+++ b/test/ec.js
@@ -3,7 +3,7 @@ var assert = require('assert')
 var sec = require('../').sec
 var ecparams = sec('secp256k1')
 
-var BigInteger = require('..').BigInteger
+var BigInteger = require('bigi')
 var ECPointFp = require('../').ECPointFp
 
 describe('ec', function() {
diff --git a/test/ecdsa.js b/test/ecdsa.js
index 1516087..fedeb6c 100644
--- a/test/ecdsa.js
+++ b/test/ecdsa.js
@@ -4,7 +4,7 @@ var ecdsa = require('..').ecdsa
 var sec = require('..').sec
 var ecparams = sec("secp256k1")
 
-var BigInteger = require('..').BigInteger
+var BigInteger = require('bigi')
 var ECKey = require('..').ECKey
 var ECPubKey = require('..').ECPubKey
 var Message = require('..').Message