diff --git a/package-lock.json b/package-lock.json
index 074a81f..cf04564 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -23,9 +23,9 @@
       }
     },
     "@openzeppelin/contracts": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-3.0.1.tgz",
-      "integrity": "sha512-uSrD7hZ0ViuHGqHZbeHawZBi/uy7aBiNramXAt2dFFuSuoU4u9insS3V3zdVfOnYSPreUo636xSOuQIFN4//HA=="
+      "version": "4.7.2",
+      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-4.7.2.tgz",
+      "integrity": "sha512-4n/JL9izql8303mPqPdubuna/DWEMbmOzWYUWyCPhjhiEr2w3nQrjE7vZz1fBF+wzzP6dZbIcsgqACk53c9FGA=="
     },
     "@types/node": {
       "version": "11.11.6",
diff --git a/package.json b/package.json
index 8d97a96..27240c5 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
-    "@openzeppelin/contracts": "^3.0.1",
+    "@openzeppelin/contracts": "^4.7.2",
     "axios": "^0.19.2",
     "bn.js": "^5.1.2",
     "loom-js": "^1.55.0",