diff --git a/app/package-lock.json b/app/package-lock.json
index cf565d3..43b37a1 100644
--- a/app/package-lock.json
+++ b/app/package-lock.json
@@ -203,9 +203,9 @@
       }
     },
     "acorn": {
-      "version": "5.7.3",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.3.tgz",
-      "integrity": "sha512-T/zvzYRfbVojPWahDsE5evJdHb3oJoQfFbsrKM7w5Zcs++Tr257tia3BmMP8XYVjp1S9RZXQMh7gao96BlqZOw==",
+      "version": "5.7.4",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.4.tgz",
+      "integrity": "sha512-1D++VG7BhrtvQpNbBzovKNc1FLGGEE/oGe7b9xJm/RFHMBeUaUGpluV9RLjZa47YFdPcDAenEYuq9pQPcMdLJg==",
       "dev": true
     },
     "acorn-dynamic-import": {
@@ -4329,6 +4329,11 @@
         "wrappy": "1"
       }
     },
+    "openzeppelin-solidity": {
+      "version": "2.5.0",
+      "resolved": "https://registry.npmjs.org/openzeppelin-solidity/-/openzeppelin-solidity-2.5.0.tgz",
+      "integrity": "sha512-I0yRC3nff9Kn2LDWuz02fuw0EuomVQ9Z8lHzdqh8P9BiOUzIk8frQRxn/a1Kva3StF6hwPP+Dh3/SQ2ily1Pow=="
+    },
     "opn": {
       "version": "5.4.0",
       "resolved": "https://registry.npmjs.org/opn/-/opn-5.4.0.tgz",