diff --git a/package.json b/package.json
index 854bf61..1f862e8 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,7 @@
     "typescript": "^4.2.4"
   },
   "dependencies": {
-    "@openzeppelin/contracts": "3.4.2",
+    "@openzeppelin/contracts": "4.7.2",
     "@ricokahler/pool": "^1.1.2",
     "@types/async-lock": "^1.1.2",
     "@types/lodash": "^4.14.168",
diff --git a/yarn.lock b/yarn.lock
index 79c9e72..83d3b6c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -467,10 +467,10 @@
     "@types/sinon-chai" "^3.2.3"
     "@types/web3" "1.0.19"
 
-"@openzeppelin/contracts@3.4.2":
-  version "3.4.2"
-  resolved "https://registry.yarnpkg.com/@openzeppelin/contracts/-/contracts-3.4.2.tgz#d81f786fda2871d1eb8a8c5a73e455753ba53527"
-  integrity sha512-z0zMCjyhhp4y7XKAcDAi3Vgms4T2PstwBdahiO0+9NaGICQKjynK3wduSRplTgk4LXmoO1yfDGO5RbjKYxtuxA==
+"@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==
 
 "@resolver-engine/core@^0.3.3":
   version "0.3.3"