diff --git a/simple-trader/package.json b/simple-trader/package.json
index 5c76959..24189b7 100644
--- a/simple-trader/package.json
+++ b/simple-trader/package.json
@@ -15,7 +15,7 @@
   },
   "devDependencies": {
     "@nomiclabs/hardhat-ethers": "^2.0.4",
-    "@openzeppelin/contracts": "^4.4.2",
+    "@openzeppelin/contracts": "^4.7.1",
     "@typechain/ethers-v5": "^9.0.0",
     "@types/mocha": "^9.1.0",
     "hardhat": "^2.8.2",
diff --git a/simple-trader/yarn.lock b/simple-trader/yarn.lock
index 77b1e20..936c83d 100644
--- a/simple-trader/yarn.lock
+++ b/simple-trader/yarn.lock
@@ -428,10 +428,10 @@
   resolved "https://registry.yarnpkg.com/@nomiclabs/hardhat-ethers/-/hardhat-ethers-2.0.4.tgz#288889c338acaf47cabd29020e561d0077b7efcf"
   integrity sha512-7LMR344TkdCYkMVF9LuC9VU2NBIi84akQiwqm7OufpWaDgHbWhuanY53rk3SVAW0E4HBk5xn5wl5+bN5f+Mq5w==
 
-"@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/contracts@^4.7.1":
+  version "4.7.1"
+  resolved "https://registry.yarnpkg.com/@openzeppelin/contracts/-/contracts-4.7.1.tgz#33d0a857b76b18d313e6bb6ed28cdaf367e90cfe"
+  integrity sha512-UXmAjKARsXORHlHZu5GCD7ZbRKm6nU8UHnbuT/QJJa2JEOEcbvV/X8w/sUk62Sl9VZuuljM1akrZLyAtzUgsxw==
 
 "@sentry/core@5.30.0":
   version "5.30.0"