diff --git a/package-lock.json b/package-lock.json
index db2d587..bb56aad 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5102,9 +5102,9 @@
       }
     },
     "@openzeppelin/contracts": {
-      "version": "2.5.1",
-      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-2.5.1.tgz",
-      "integrity": "sha512-qIy6tLx8rtybEsIOAlrM4J/85s2q2nPkDqj/Rx46VakBZ0LwtFhXIVub96LXHczQX0vaqmAueDqNPXtbSXSaYQ==",
+      "version": "4.7.2",
+      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-4.7.2.tgz",
+      "integrity": "sha512-4n/JL9izql8303mPqPdubuna/DWEMbmOzWYUWyCPhjhiEr2w3nQrjE7vZz1fBF+wzzP6dZbIcsgqACk53c9FGA==",
       "dev": true
     },
     "@openzeppelin/test-helpers": {
diff --git a/package.json b/package.json
index 6201e5f..ffb99df 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
     "@nomiclabs/hardhat-truffle5": "^2.0.0",
     "@nomiclabs/hardhat-waffle": "^2.0.1",
     "@nomiclabs/hardhat-web3": "^2.0.0",
-    "@openzeppelin/contracts": "^2.5.1",
+    "@openzeppelin/contracts": "^4.7.2",
     "@openzeppelin/test-helpers": "^0.5.9",
     "@typechain/truffle-v5": "^2.0.2",
     "@typechain/web3-v1": "^1.0.0",