diff --git a/lib/blockchain/chainentry.js b/lib/blockchain/chainentry.js
index c40fefb8..313ef567 100644
--- a/lib/blockchain/chainentry.js
+++ b/lib/blockchain/chainentry.js
@@ -9,7 +9,7 @@
 
 const assert = require('bsert');
 const bio = require('bufio');
-const BN = require('bn.js');
+const BN = require('bcrypto/lib/bn.js');
 const consensus = require('../protocol/consensus');
 const hash256 = require('bcrypto/lib/hash256');
 const util = require('../utils/util');
diff --git a/lib/mining/common.js b/lib/mining/common.js
index 47c3135b..1754e1ac 100644
--- a/lib/mining/common.js
+++ b/lib/mining/common.js
@@ -8,7 +8,7 @@
 
 const assert = require('bsert');
 const consensus = require('../protocol/consensus');
-const BN = require('bn.js');
+const BN = require('bcrypto/lib/bn.js');
 
 /**
  * @exports mining/common
diff --git a/lib/protocol/consensus.js b/lib/protocol/consensus.js
index 7049c16a..951a4f94 100644
--- a/lib/protocol/consensus.js
+++ b/lib/protocol/consensus.js
@@ -12,7 +12,7 @@
  */
 
 const assert = require('bsert');
-const BN = require('bn.js');
+const BN = require('bcrypto/lib/bn.js');
 
 /**
  * One bitcoin in satoshis.
diff --git a/lib/protocol/networks.js b/lib/protocol/networks.js
index 63e81668..50a7e192 100644
--- a/lib/protocol/networks.js
+++ b/lib/protocol/networks.js
@@ -11,7 +11,7 @@
  * @module protocol/networks
  */
 
-const BN = require('bn.js');
+const BN = require('bcrypto/lib/bn.js');
 
 const network = exports;
 
diff --git a/migrate/chaindb2to3.js b/migrate/chaindb2to3.js
index 2357a7d2..a07a7e4c 100644
--- a/migrate/chaindb2to3.js
+++ b/migrate/chaindb2to3.js
@@ -18,7 +18,7 @@ if (process.argv.indexOf('-h') !== -1
 const assert = require('assert');
 const bdb = require('bdb');
 const hash256 = require('bcrypto/lib/hash256');
-const BN = require('bn.js');
+const BN = require('bcrypto/lib/bn.js');
 const bio = require('bufio');
 const LRU = require('blru');
 const {BufferMap} = require('buffer-map');
diff --git a/package.json b/package.json
index e3592ea7..9a519292 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,6 @@
     "blru": "~0.1.2",
     "blst": "~0.1.1",
     "bmutex": "~0.1.2",
-    "bn.js": "~4.11.8",
     "bsert": "~0.0.4",
     "bsip": "~0.1.1",
     "bsock": "~0.1.2",
diff --git a/test/consensus-test.js b/test/consensus-test.js
index 5cde951e..10b09860 100644
--- a/test/consensus-test.js
+++ b/test/consensus-test.js
@@ -5,7 +5,7 @@
 
 const assert = require('./util/assert');
 const consensus = require('../lib/protocol/consensus');
-const BN = require('bn.js');
+const BN = require('bcrypto/lib/bn.js');
 
 describe('Consensus', function() {
   it('should calculate reward properly', () => {