diff --git a/lib/block/blockheader.js b/lib/block/blockheader.js
index cf34ea0..811615b 100644
--- a/lib/block/blockheader.js
+++ b/lib/block/blockheader.js
@@ -9,7 +9,7 @@ var Hash = require('../crypto/hash');
 var JSUtil = require('../util/js');
 var $ = require('../util/preconditions');
 
-var GENESIS_BITS = 0x2003ffff;
+var GENESIS_BITS = 0x2007ffff;
 
 /**
  * Instantiate a BlockHeader from a Buffer, JSON object, or Object with
diff --git a/lib/networks.js b/lib/networks.js
index de2abf0..a4b64fd 100644
--- a/lib/networks.js
+++ b/lib/networks.js
@@ -140,15 +140,12 @@ addNetwork({
   xprivkey: 0x0488ade4,
   zaddr: 0x169a,
   zkey: 0xab36,
-  networkMagic: 0xf91bacab,
+  networkMagic: 0xf9f3acab,
   port: 8233,
   dnsSeeds: [
-//    'seed.bitcoin.sipa.be',
-//    'dnsseed.bluematt.me',
-//    'dnsseed.bitcoin.dashjr.org',
-//    'seed.bitcoinstats.com',
-//    'seed.bitnodes.io',
-//    'bitseed.xf2.org'
+    'dnsseed.z.cash',
+    'dnsseed.str4d.xyz',
+    'dnsseed.znodes.org'
   ]
 });
 
@@ -180,7 +177,7 @@ var testnet = get('testnet');
 
 var TESTNET = {
   PORT: 18233,
-  NETWORK_MAGIC: BufferUtil.integerAsBuffer(0xf99f24b6),
+  NETWORK_MAGIC: BufferUtil.integerAsBuffer(0xfa1a24b6),
   DNS_SEEDS: [
     'dnsseed.testnet.z.cash',
   ]