diff --git a/package-lock.json b/package-lock.json
index 3f3306d..225c2d8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -982,9 +982,9 @@
       }
     },
     "@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==",
       "dev": true
     },
     "@resolver-engine/core": {
diff --git a/package.json b/package.json
index 9e47269..70de4aa 100644
--- a/package.json
+++ b/package.json
@@ -42,7 +42,7 @@
     "@nomiclabs/buidler": "^1.3.7",
     "@nomiclabs/buidler-ethers": "^1.3.4",
     "@nomiclabs/buidler-etherscan": "^1.3.3",
-    "@openzeppelin/contracts": "2.5.0",
+    "@openzeppelin/contracts": "4.7.2",
     "@types/chai": "^4.2.8",
     "@types/fs-extra": "^8.1.1",
     "@types/mocha": "^7.0.1",