diff --git a/package.json b/package.json
index 0ff3c33..07d77b2 100644
--- a/package.json
+++ b/package.json
@@ -13,6 +13,6 @@
     "hardhat": "^2.0.7"
   },
   "dependencies": {
-    "@openzeppelin/contracts": "^3.4.1"
+    "@openzeppelin/contracts": "^4.4.1"
   }
 }
diff --git a/yarn.lock b/yarn.lock
index 9df3cd3..777b15f 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -595,10 +595,10 @@
     "@types/sinon-chai" "^3.2.3"
     "@types/web3" "1.0.19"
 
-"@openzeppelin/contracts@^3.4.1":
-  version "3.4.1"
-  resolved "https://registry.yarnpkg.com/@openzeppelin/contracts/-/contracts-3.4.1.tgz#03c891fec7f93be0ae44ed74e57a122a38732ce7"
-  integrity sha512-cUriqMauq1ylzP2TxePNdPqkwI7Le3Annh4K9rrpvKfSBB/bdW+Iu1ihBaTIABTAAJ85LmKL5SSPPL9ry8d1gQ==
+"@openzeppelin/contracts@^4.4.1":
+  version "4.4.1"
+  resolved "https://registry.yarnpkg.com/@openzeppelin/contracts/-/contracts-4.4.1.tgz#3382db2cd83ab565ed9626765e7da92944b45de8"
+  integrity sha512-o+pHCf/yMLSlV5MkDQEzEQL402i6SoRnktru+0rdSxVEFZcTzzGhZCAtZjUFyKGazMSv1TilzMg+RbED1N8XHQ==
 
 "@openzeppelin/hardhat-upgrades@^1.6.0":
   version "1.6.0"