diff --git a/packages/ripple-address-codec/package.json b/packages/ripple-address-codec/package.json
index 3d08e27b..791145aa 100644
--- a/packages/ripple-address-codec/package.json
+++ b/packages/ripple-address-codec/package.json
@@ -21,9 +21,10 @@
   "devDependencies": {
     "codecov.io": "^0.1.6",
     "coveralls": "~2.11.4",
-    "eslint": "^1.6.0",
+    "eslint": "^4.19.1",
+    "eslint-plugin-no-unused-expressions": "^0.1.0",
     "istanbul": "~0.3.21",
-    "mocha": "^2.3.3"
+    "mocha": "^5.0.5"
   },
   "readmeFilename": "README.md",
   "engines": {
diff --git a/packages/ripple-address-codec/src/index.js b/packages/ripple-address-codec/src/index.js
index 6548bd98..2b2ca988 100644
--- a/packages/ripple-address-codec/src/index.js
+++ b/packages/ripple-address-codec/src/index.js
@@ -1,17 +1,17 @@
-'use strict';
+'use strict'
 
-var createHash = require('create-hash');
-var apiFactory = require('x-address-codec');
+const createHash = require('create-hash')
+const apiFactory = require('x-address-codec')
 
-var NODE_PUBLIC = 28;
-var NODE_PRIVATE = 32;
-var ACCOUNT_ID = 0;
-var FAMILY_SEED = 33;
-var ED25519_SEED = [0x01, 0xE1, 0x4B];
+const NODE_PUBLIC = 28
+const NODE_PRIVATE = 32
+const ACCOUNT_ID = 0
+const FAMILY_SEED = 33
+const ED25519_SEED = [0x01, 0xE1, 0x4B]
 
 module.exports = apiFactory({
   sha256: function(bytes) {
-    return createHash('sha256').update(new Buffer(bytes)).digest();
+    return createHash('sha256').update(new Buffer(bytes)).digest()
   },
   defaultAlphabet: 'ripple',
   codecMethods: {
@@ -30,4 +30,4 @@ module.exports = apiFactory({
     NodePublic: {version: NODE_PUBLIC, expectedLength: 33},
     NodePrivate: {version: NODE_PRIVATE, expectedLength: 32},
     K256Seed: {version: FAMILY_SEED, expectedLength: 16}}
-});
+})
diff --git a/packages/ripple-address-codec/test/codec-test.js b/packages/ripple-address-codec/test/codec-test.js
index 777c176c..1d9f5284 100644
--- a/packages/ripple-address-codec/test/codec-test.js
+++ b/packages/ripple-address-codec/test/codec-test.js
@@ -1,71 +1,73 @@
-'use strict';
+/* eslint-disable no-unused-expressions/no-unused-expressions */
 
-var assert = require('assert');
-var api = require('../');
+'use strict'
+
+const assert = require('assert')
+const api = require('../')
 
 function toHex(bytes) {
-  return new Buffer(bytes).toString('hex').toUpperCase();
+  return new Buffer(bytes).toString('hex').toUpperCase()
 }
 
 function toBytes(hex) {
-  return new Buffer(hex, 'hex').toJSON().data;
+  return new Buffer(hex, 'hex').toJSON().data
 }
 
 describe('ripple-address-codec', function() {
   function makeTest(type, base58, hex) {
     it('can translate between ' + hex + ' and ' + base58, function() {
-      var actual = api['encode' + type](toBytes(hex));
-      assert.equal(actual, base58);
-    });
+      const actual = api['encode' + type](toBytes(hex))
+      assert.equal(actual, base58)
+    })
     it('can translate between ' + base58 + ' and ' + hex, function() {
-      var buf = api['decode' + type](base58);
-      assert.equal(toHex(buf), hex);
-    });
+      const buf = api['decode' + type](base58)
+      assert.equal(toHex(buf), hex)
+    })
   }
 
   makeTest('AccountID', 'rJrRMgiRgrU6hDF4pgu5DXQdWyPbY35ErN',
-                        'BA8E78626EE42C41B46D46C3048DF3A1C3C87072');
+    'BA8E78626EE42C41B46D46C3048DF3A1C3C87072')
 
   makeTest(
     'NodePublic',
     'n9MXXueo837zYH36DvMc13BwHcqtfAWNJY5czWVbp7uYTj7x17TH',
-    '0388E5BA87A000CB807240DF8C848EB0B5FFA5C8E5A521BC8E105C0F0A44217828');
+    '0388E5BA87A000CB807240DF8C848EB0B5FFA5C8E5A521BC8E105C0F0A44217828')
 
   makeTest('K256Seed', 'sn259rEFXrQrWyx3Q7XneWcwV6dfL',
-                       'CF2DE378FBDD7E2EE87D486DFB5A7BFF');
+    'CF2DE378FBDD7E2EE87D486DFB5A7BFF')
 
   makeTest('EdSeed', 'sEdTM1uX8pu2do5XvTnutH6HsouMaM2',
-                     '4C3A1D213FBDFB14C7C28D609469B341');
+    '4C3A1D213FBDFB14C7C28D609469B341')
 
   it('can decode arbitray seeds', function() {
-    var decoded = api.decodeSeed('sEdTM1uX8pu2do5XvTnutH6HsouMaM2');
-    assert.equal(toHex(decoded.bytes), '4C3A1D213FBDFB14C7C28D609469B341');
-    assert.equal(decoded.type, 'ed25519');
+    const decoded = api.decodeSeed('sEdTM1uX8pu2do5XvTnutH6HsouMaM2')
+    assert.equal(toHex(decoded.bytes), '4C3A1D213FBDFB14C7C28D609469B341')
+    assert.equal(decoded.type, 'ed25519')
 
-    var decoded2 = api.decodeSeed('sn259rEFXrQrWyx3Q7XneWcwV6dfL');
-    assert.equal(toHex(decoded2.bytes), 'CF2DE378FBDD7E2EE87D486DFB5A7BFF');
-    assert.equal(decoded2.type, 'secp256k1');
-  });
+    const decoded2 = api.decodeSeed('sn259rEFXrQrWyx3Q7XneWcwV6dfL')
+    assert.equal(toHex(decoded2.bytes), 'CF2DE378FBDD7E2EE87D486DFB5A7BFF')
+    assert.equal(decoded2.type, 'secp256k1')
+  })
 
   it('can pass a type as second arg to encodeSeed', function() {
-    var edSeed = 'sEdTM1uX8pu2do5XvTnutH6HsouMaM2';
-    var decoded = api.decodeSeed(edSeed);
-    assert.equal(toHex(decoded.bytes), '4C3A1D213FBDFB14C7C28D609469B341');
-    assert.equal(decoded.type, 'ed25519');
-    assert.equal(api.encodeSeed(decoded.bytes, decoded.type), edSeed);
-  });
+    const edSeed = 'sEdTM1uX8pu2do5XvTnutH6HsouMaM2'
+    const decoded = api.decodeSeed(edSeed)
+    assert.equal(toHex(decoded.bytes), '4C3A1D213FBDFB14C7C28D609469B341')
+    assert.equal(decoded.type, 'ed25519')
+    assert.equal(api.encodeSeed(decoded.bytes, decoded.type), edSeed)
+  })
 
   it('isValidAddress - secp256k1 address valid', function() {
-    assert(api.isValidAddress('rU6K7V3Po4snVhBBaU29sesqs2qTQJWDw1'));
-  });
+    assert(api.isValidAddress('rU6K7V3Po4snVhBBaU29sesqs2qTQJWDw1'))
+  })
   it('isValidAddress - ed25519 address valid', function() {
-    assert(api.isValidAddress('rLUEXYuLiQptky37CqLcm9USQpPiz5rkpD'));
-  });
+    assert(api.isValidAddress('rLUEXYuLiQptky37CqLcm9USQpPiz5rkpD'))
+  })
   it('isValidAddress - invalid', function() {
-    assert(!api.isValidAddress('rU6K7V3Po4snVhBBaU29sesqs2qTQJWDw2'));
-  });
+    assert(!api.isValidAddress('rU6K7V3Po4snVhBBaU29sesqs2qTQJWDw2'))
+  })
   it('isValidAddress - empty', function() {
-    assert(!api.isValidAddress(''));
-  });
+    assert(!api.isValidAddress(''))
+  })
 
-});
+})