diff --git a/package-lock.json b/package-lock.json
index 1134bba..122da81 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2204,31 +2204,32 @@
       }
     },
     "ethereumjs-wallet": {
-      "version": "0.6.2",
-      "resolved": "https://registry.npmjs.org/ethereumjs-wallet/-/ethereumjs-wallet-0.6.2.tgz",
-      "integrity": "sha512-DHEKPV9lYORM7dL8602dkb+AgdfzCYz2lxpdYQoD3OwG355LLDuivW9rGuLpDMCry/ORyBYV6n+QCo/71SwACg==",
+      "version": "0.6.3",
+      "resolved": "https://registry.npmjs.org/ethereumjs-wallet/-/ethereumjs-wallet-0.6.3.tgz",
+      "integrity": "sha512-qiXPiZOsStem+Dj/CQHbn5qex+FVkuPmGH7SvSnA9F3tdRDt8dLMyvIj3+U05QzVZNPYh4HXEdnzoYI4dZkr9w==",
       "dev": true,
       "requires": {
         "aes-js": "^3.1.1",
         "bs58check": "^2.1.2",
-        "ethereumjs-util": "^5.2.0",
-        "hdkey": "^1.0.0",
+        "ethereumjs-util": "^6.0.0",
+        "hdkey": "^1.1.0",
+        "randombytes": "^2.0.6",
         "safe-buffer": "^5.1.2",
-        "scrypt.js": "^0.2.0",
+        "scrypt.js": "^0.3.0",
         "utf8": "^3.0.0",
         "uuid": "^3.3.2"
       },
       "dependencies": {
         "aes-js": {
-          "version": "3.1.1",
-          "resolved": "https://registry.npmjs.org/aes-js/-/aes-js-3.1.1.tgz",
-          "integrity": "sha512-cEA0gBelItZZV7iBiL8ApCiNgc+gBWJJ4uoORhbu6vOqAJ0UL9wIlxr4RI7ij9SSVzy6AnPwiu37kVYiHCl3nw==",
+          "version": "3.1.2",
+          "resolved": "https://registry.npmjs.org/aes-js/-/aes-js-3.1.2.tgz",
+          "integrity": "sha512-e5pEa2kBnBOgR4Y/p20pskXI74UEz7de8ZGVo58asOtvSVG5YAbJeELPZxOmt+Bnz3rX753YKhfIn4X4l1PPRQ==",
           "dev": true
         },
         "base-x": {
-          "version": "3.0.4",
-          "resolved": "https://registry.npmjs.org/base-x/-/base-x-3.0.4.tgz",
-          "integrity": "sha512-UYOadoSIkEI/VrRGSG6qp93rp2WdokiAiNYDfGW5qURAY8GiAQkvMbwNNSDYiVJopqv4gCna7xqf4rrNGp+5AA==",
+          "version": "3.0.5",
+          "resolved": "https://registry.npmjs.org/base-x/-/base-x-3.0.5.tgz",
+          "integrity": "sha512-C3picSgzPSLE+jW3tcBzJoGwitOtazb5B+5YmAxZm2ybmTi9LNgAtDO/jjVEBZwHoXmDBZ9m/IELj3elJVRBcA==",
           "dev": true,
           "requires": {
             "safe-buffer": "^5.0.1"
@@ -2254,21 +2255,6 @@
             "safe-buffer": "^5.1.2"
           }
         },
-        "ethereumjs-util": {
-          "version": "5.2.0",
-          "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-5.2.0.tgz",
-          "integrity": "sha512-CJAKdI0wgMbQFLlLRtZKGcy/L6pzVRgelIZqRqNbuVFM3K9VEnyfbcvz0ncWMRNCe4kaHWjwRYQcYMucmwsnWA==",
-          "dev": true,
-          "requires": {
-            "bn.js": "^4.11.0",
-            "create-hash": "^1.1.2",
-            "ethjs-util": "^0.1.3",
-            "keccak": "^1.0.2",
-            "rlp": "^2.0.0",
-            "safe-buffer": "^5.1.1",
-            "secp256k1": "^3.0.1"
-          }
-        },
         "hdkey": {
           "version": "1.1.0",
           "resolved": "https://registry.npmjs.org/hdkey/-/hdkey-1.1.0.tgz",
@@ -2280,6 +2266,16 @@
             "secp256k1": "^3.0.1"
           }
         },
+        "scrypt.js": {
+          "version": "0.3.0",
+          "resolved": "https://registry.npmjs.org/scrypt.js/-/scrypt.js-0.3.0.tgz",
+          "integrity": "sha512-42LTc1nyFsyv/o0gcHtDztrn+aqpkaCNt5Qh7ATBZfhEZU7IC/0oT/qbBH+uRNoAPvs2fwiOId68FDEoSRA8/A==",
+          "dev": true,
+          "requires": {
+            "scrypt": "^6.0.2",
+            "scryptsy": "^1.2.1"
+          }
+        },
         "utf8": {
           "version": "3.0.0",
           "resolved": "https://registry.npmjs.org/utf8/-/utf8-3.0.0.tgz",
@@ -2754,11 +2750,13 @@
         },
         "balanced-match": {
           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
+          "optional": true,
           "requires": {
             "balanced-match": "^1.0.0",
             "concat-map": "0.0.1"
@@ -2771,15 +2769,18 @@
         },
         "code-point-at": {
           "version": "1.1.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "concat-map": {
           "version": "0.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "console-control-strings": {
           "version": "1.1.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "core-util-is": {
           "version": "1.0.2",
@@ -2882,7 +2883,8 @@
         },
         "inherits": {
           "version": "2.0.3",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "ini": {
           "version": "1.3.5",
@@ -2892,6 +2894,7 @@
         "is-fullwidth-code-point": {
           "version": "1.0.0",
           "bundled": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -2904,17 +2907,20 @@
         "minimatch": {
           "version": "3.0.4",
           "bundled": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
         },
         "minimist": {
           "version": "0.0.8",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "minipass": {
           "version": "2.2.4",
           "bundled": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "^5.1.1",
             "yallist": "^3.0.0"
@@ -2931,6 +2937,7 @@
         "mkdirp": {
           "version": "0.5.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -3003,7 +3010,8 @@
         },
         "number-is-nan": {
           "version": "1.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "object-assign": {
           "version": "4.1.1",
@@ -3013,6 +3021,7 @@
         "once": {
           "version": "1.4.0",
           "bundled": true,
+          "optional": true,
           "requires": {
             "wrappy": "1"
           }
@@ -3118,6 +3127,7 @@
         "string-width": {
           "version": "1.0.2",
           "bundled": true,
+          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
diff --git a/package.json b/package.json
index 3800588..58e4c4f 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,7 @@
   "devDependencies": {
     "@digix/tempo": "0.2.0",
     "chai": "4.1.2",
-    "ethereumjs-wallet": "0.6.2",
+    "ethereumjs-wallet": "0.6.3",
     "ganache-core": "2.2.1",
     "mocha": "5.1.1",
     "truffle-contract": "3.0.6",