diff --git a/package-lock.json b/package-lock.json
index 8cf5436..45cff25 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -263,9 +263,9 @@
       "integrity": "sha512-eMk0b9ReBbV23xXU693TAIrLyeO5iTgBZGSJfpqriG8UkYvr/hC9u9pyMlAakDNHWmbhMZCDs6KQO0jzKD8OTw=="
     },
     "@openzeppelin/contracts": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-3.2.0.tgz",
-      "integrity": "sha512-bUOmkSoPkjnUyMiKo6RYnb0VHBk5D9KKDAgNLzF41aqAM3TeE0yGdFF5dVRcV60pZdJLlyFT/jjXIZCWyyEzAQ=="
+      "version": "4.7.2",
+      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-4.7.2.tgz",
+      "integrity": "sha512-4n/JL9izql8303mPqPdubuna/DWEMbmOzWYUWyCPhjhiEr2w3nQrjE7vZz1fBF+wzzP6dZbIcsgqACk53c9FGA=="
     },
     "@sindresorhus/is": {
       "version": "0.14.0",
diff --git a/package.json b/package.json
index 6f3c429..d066a57 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
     "test": "test"
   },
   "dependencies": {
-    "@openzeppelin/contracts": "^3.2.0",
+    "@openzeppelin/contracts": "^4.7.2",
     "@truffle/hdwallet-provider": "^1.2.0",
     "bignumber.js": "^9.0.1",
     "bs58": "^4.0.1",