diff --git a/package.json b/package.json
index 4d415ec8..34a7cecf 100644
--- a/package.json
+++ b/package.json
@@ -50,7 +50,7 @@
     "@nomiclabs/hardhat-etherscan": "^2.1.8",
     "@nomiclabs/hardhat-truffle5": "^2.0.3",
     "@nomiclabs/hardhat-web3": "^2.0.0",
-    "@openzeppelin/contracts": "3.4.1",
+    "@openzeppelin/contracts": "4.7.3",
     "@openzeppelin/contracts-upgradeable": "3.4.1",
     "@openzeppelin/hardhat-upgrades": "^1.12.0",
     "@openzeppelin/test-helpers": "^0.5.15",
diff --git a/yarn.lock b/yarn.lock
index 94699c54..32661fc9 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -639,10 +639,10 @@
   resolved "https://registry.npmjs.org/@openzeppelin/contracts-upgradeable/-/contracts-upgradeable-3.4.1.tgz"
   integrity sha512-wBGlUzEkOxcj/ghtcF2yKc8ZYh+PTUtm1mK38zoENulJ6aplij7eH8quo3lMugfzPJy+V6V5qI8QhdQmCn7hkQ==
 
-"@openzeppelin/contracts@3.4.1":
-  version "3.4.1"
-  resolved "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-3.4.1.tgz"
-  integrity sha512-cUriqMauq1ylzP2TxePNdPqkwI7Le3Annh4K9rrpvKfSBB/bdW+Iu1ihBaTIABTAAJ85LmKL5SSPPL9ry8d1gQ==
+"@openzeppelin/contracts@4.7.3":
+  version "4.7.3"
+  resolved "https://registry.yarnpkg.com/@openzeppelin/contracts/-/contracts-4.7.3.tgz#939534757a81f8d69cc854c7692805684ff3111e"
+  integrity sha512-dGRS0agJzu8ybo44pCIf3xBaPQN/65AIXNgK8+4gzKd5kbvlqyxryUYVLJv7fK98Seyd2hDZzVEHSWAh0Bt1Yw==
 
 "@openzeppelin/hardhat-upgrades@^1.12.0":
   version "1.12.0"