diff --git a/package-lock.json b/package-lock.json
index 7b9a902..5770cfb 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -28,9 +28,9 @@
       }
     },
     "@openzeppelin/contracts": {
-      "version": "2.5.0",
-      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-2.5.0.tgz",
-      "integrity": "sha512-t3jm8FrhL9tkkJTofkznTqo/XXdHi21w5yXwalEnaMOp22ZwZ0f/mmKdlgMMLPFa6bSVHbY88mKESwJT/7m5Lg=="
+      "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 686b4f6..ff84ff1 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,7 @@
     "pepe"
   ],
   "dependencies": {
-    "@openzeppelin/contracts": "^2.5.0",
+    "@openzeppelin/contracts": "^4.7.2",
     "ethereumjs-wallet": "^0.6.3",
     "ganache-cli": "^6.9.1",
     "solidity-coverage": "^0.7.2",