diff --git a/package.json b/package.json
index 2eb037d..96ad787 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
   },
   "dependencies": {
     "@nomiclabs/hardhat-etherscan": "^2.1.0",
-    "@openzeppelin/contracts": "^3.3.0",
+    "@openzeppelin/contracts": "^4.4.2",
     "ramda": "^0.27.1"
   }
 }
diff --git a/yarn.lock b/yarn.lock
index efe668b..0f8385d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -573,10 +573,10 @@
     ethers "^4.0.0-beta.1"
     source-map-support "^0.5.19"
 
-"@openzeppelin/contracts@^3.3.0":
-  version "3.4.1"
-  resolved "https://registry.yarnpkg.com/@openzeppelin/contracts/-/contracts-3.4.1.tgz#03c891fec7f93be0ae44ed74e57a122a38732ce7"
-  integrity sha512-cUriqMauq1ylzP2TxePNdPqkwI7Le3Annh4K9rrpvKfSBB/bdW+Iu1ihBaTIABTAAJ85LmKL5SSPPL9ry8d1gQ==
+"@openzeppelin/contracts@^4.4.2":
+  version "4.4.2"
+  resolved "https://registry.yarnpkg.com/@openzeppelin/contracts/-/contracts-4.4.2.tgz#4e889c9c66e736f7de189a53f8ba5b8d789425c2"
+  integrity sha512-NyJV7sJgoGYqbtNUWgzzOGW4T6rR19FmX1IJgXGdapGPWsuMelGJn9h03nos0iqfforCbCB0iYIR0MtIuIFLLw==
 
 "@openzeppelin/hardhat-upgrades@^1.6.0":
   version "1.7.0"