diff --git a/package-lock.json b/package-lock.json
index 6c0d3e6..ad3e96f 100644
--- a/package-lock.json
+++ b/package-lock.json
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@@ -7424,7 +7406,7 @@
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@@ -8184,7 +8166,8 @@
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@@ -8467,7 +8450,7 @@
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@@ -8503,7 +8486,8 @@
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         "bignumber.js": {
-          "version": "git+https://github.com/debris/bignumber.js.git#c7a38de919ed75e6fb6ba38051986e294b328df9"
+          "version": "git+https://github.com/debris/bignumber.js.git#c7a38de919ed75e6fb6ba38051986e294b328df9",
+          "from": "bignumber.js@git+https://github.com/debris/bignumber.js.git#c7a38de919ed75e6fb6ba38051986e294b328df9"
         },
         "crypto-js": {
           "version": "3.1.8",
@@ -8529,7 +8513,7 @@
           "resolved": "https://registry.npmjs.org/web3/-/web3-0.16.0.tgz",
           "integrity": "sha1-pFVBdc1GKUMDWx8dOUMvdBxrYBk=",
           "requires": {
-            "bignumber.js": "git+https://github.com/debris/bignumber.js.git#c7a38de919ed75e6fb6ba38051986e294b328df9",
+            "bignumber.js": "bignumber.js@git+https://github.com/debris/bignumber.js.git#c7a38de919ed75e6fb6ba38051986e294b328df9",
             "crypto-js": "3.1.8",
             "utf8": "2.1.2",
             "xmlhttprequest": "1.8.0"
@@ -8879,7 +8863,8 @@
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.0.2.tgz",
       "integrity": "sha1-hFK0u36Dx8GI2AQcGoN8dz1ti7k=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "yargs": {
       "version": "4.8.1",
diff --git a/package.json b/package.json
index d98249b..0dff60f 100644
--- a/package.json
+++ b/package.json
@@ -30,7 +30,7 @@
   "dependencies": {
     "chalk": "^2.3.2",
     "cross-env": "^5.1.4",
-    "truffle": "^4.1.5",
+    "truffle": "^5.0.24",
     "truffle-contract": "^3.0.4",
     "truffle-hdwallet-provider": "0.0.3"
   },