diff --git a/ethpm.json b/ethpm.json
index 4deef2b7c..7e845bbf1 100644
--- a/ethpm.json
+++ b/ethpm.json
@@ -1,6 +1,6 @@
 {
   "package_name": "zeppelin",
-  "version": "1.5.0",
+  "version": "1.6.0",
   "description": "Secure Smart Contract library for Solidity",
   "authors": [
     "Manuel Araoz <manuelaraoz@gmail.com>"
diff --git a/package-lock.json b/package-lock.json
index 293b8a795..e421b8039 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "zeppelin-solidity",
-  "version": "1.5.0",
+  "version": "1.6.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -2747,6 +2747,28 @@
         }
       }
     },
+    "ethjs-abi": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/ethjs-abi/-/ethjs-abi-0.2.1.tgz",
+      "integrity": "sha1-4KepOn6BFjqUR3utVu3lJKtt5TM=",
+      "requires": {
+        "bn.js": "4.11.6",
+        "js-sha3": "0.5.5",
+        "number-to-bn": "1.7.0"
+      },
+      "dependencies": {
+        "bn.js": {
+          "version": "4.11.6",
+          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.6.tgz",
+          "integrity": "sha1-UzRK2xRhehP26N0s4okF0cC6MhU="
+        },
+        "js-sha3": {
+          "version": "0.5.5",
+          "resolved": "https://registry.npmjs.org/js-sha3/-/js-sha3-0.5.5.tgz",
+          "integrity": "sha1-uvDA6MVK1ZA0R9+Wreekobynmko="
+        }
+      }
+    },
     "ethjs-util": {
       "version": "0.1.4",
       "resolved": "https://registry.npmjs.org/ethjs-util/-/ethjs-util-0.1.4.tgz",
@@ -4511,8 +4533,7 @@
     "is-hex-prefixed": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/is-hex-prefixed/-/is-hex-prefixed-1.0.0.tgz",
-      "integrity": "sha1-fY035q135dEnFIkTxXPggtd39VQ=",
-      "dev": true
+      "integrity": "sha1-fY035q135dEnFIkTxXPggtd39VQ="
     },
     "is-my-json-valid": {
       "version": "2.16.0",
@@ -5627,6 +5648,22 @@
       "integrity": "sha1-CXtgK1NCKlIsGvuHkDGDNpQaAR0=",
       "dev": true
     },
+    "number-to-bn": {
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/number-to-bn/-/number-to-bn-1.7.0.tgz",
+      "integrity": "sha1-uzYjWS9+X54AMLGXe9QaDFP+HqA=",
+      "requires": {
+        "bn.js": "4.11.6",
+        "strip-hex-prefix": "1.0.0"
+      },
+      "dependencies": {
+        "bn.js": {
+          "version": "4.11.6",
+          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.6.tgz",
+          "integrity": "sha1-UzRK2xRhehP26N0s4okF0cC6MhU="
+        }
+      }
+    },
     "oauth-sign": {
       "version": "0.8.2",
       "resolved": "https://registry.npmjs.org/oauth-sign/-/oauth-sign-0.8.2.tgz",
@@ -7065,7 +7102,6 @@
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/strip-hex-prefix/-/strip-hex-prefix-1.0.0.tgz",
       "integrity": "sha1-DF8VX+8RUTczd96du1iNoFUA428=",
-      "dev": true,
       "requires": {
         "is-hex-prefixed": "1.0.0"
       }
@@ -7308,7 +7344,7 @@
     "truffle": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/truffle/-/truffle-4.0.1.tgz",
-      "integrity": "sha512-PybO+GMq3AvsfCWfEx4sbuaJlDL19iR8Ff20cO0TtP599N5JbMLlhwlffvVInPgFjP+F11vjSOYj3hT8fONs5A==",
+      "integrity": "sha1-2GYaStemyglLdRfSmxmcYObd5mU=",
       "dev": true,
       "requires": {
         "mocha": "3.5.3",
@@ -7348,7 +7384,7 @@
         "mocha": {
           "version": "3.5.3",
           "resolved": "https://registry.npmjs.org/mocha/-/mocha-3.5.3.tgz",
-          "integrity": "sha512-/6na001MJWEtYxHOV1WLfsmR4YIynkUEhBwzsb+fk2qmQ3iqsi258l/Q2MWHJMImAcNpZ8DEdYAK72NHoIQ9Eg==",
+          "integrity": "sha1-HgSA/jbS2lhY0etqzDhBiybqog0=",
           "dev": true,
           "requires": {
             "browser-stdout": "1.3.0",
diff --git a/package.json b/package.json
index 6d93e41e1..4106d1732 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "zeppelin-solidity",
-  "version": "1.5.0",
+  "version": "1.6.0",
   "description": "Secure Smart Contract library for Solidity",
   "scripts": {
     "test": "scripts/test.sh",