diff --git a/package.json b/package.json
index 02845e6..4a02507 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
     "test:ethereum": "truffle test"
   },
   "dependencies": {
-    "@openzeppelin/contracts": "3.2.0",
+    "@openzeppelin/contracts": "4.7.2",
     "ganache-cli": "^6.12.1",
     "truffle": "^5.1.52",
     "truffle-hdwallet-provider": "^1.0.17"
diff --git a/yarn.lock b/yarn.lock
index 4d8ca13..0abe72c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2,10 +2,10 @@
 # yarn lockfile v1
 
 
-"@openzeppelin/contracts@3.2.0":
-  version "3.2.0"
-  resolved "https://registry.yarnpkg.com/@openzeppelin/contracts/-/contracts-3.2.0.tgz#3e6b3a7662d8ed64271ade96ef42655db983fd9d"
-  integrity sha512-bUOmkSoPkjnUyMiKo6RYnb0VHBk5D9KKDAgNLzF41aqAM3TeE0yGdFF5dVRcV60pZdJLlyFT/jjXIZCWyyEzAQ==
+"@openzeppelin/contracts@4.7.2":
+  version "4.7.2"
+  resolved "https://registry.yarnpkg.com/@openzeppelin/contracts/-/contracts-4.7.2.tgz#7587416fe2d35abf574193515b8971bfe9f64bc7"
+  integrity sha512-4n/JL9izql8303mPqPdubuna/DWEMbmOzWYUWyCPhjhiEr2w3nQrjE7vZz1fBF+wzzP6dZbIcsgqACk53c9FGA==
 
 "@sindresorhus/is@^0.14.0":
   version "0.14.0"