diff --git a/contracts/package-lock.json b/contracts/package-lock.json
index 1da0b20..c91116c 100644
--- a/contracts/package-lock.json
+++ b/contracts/package-lock.json
@@ -5,9 +5,9 @@
   "requires": true,
   "dependencies": {
     "@openzeppelin/contracts": {
-      "version": "2.5.0",
-      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-2.5.0.tgz",
-      "integrity": "sha512-t3jm8FrhL9tkkJTofkznTqo/XXdHi21w5yXwalEnaMOp22ZwZ0f/mmKdlgMMLPFa6bSVHbY88mKESwJT/7m5Lg=="
+      "version": "4.7.2",
+      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-4.7.2.tgz",
+      "integrity": "sha512-4n/JL9izql8303mPqPdubuna/DWEMbmOzWYUWyCPhjhiEr2w3nQrjE7vZz1fBF+wzzP6dZbIcsgqACk53c9FGA=="
     },
     "@sindresorhus/is": {
       "version": "0.14.0",
diff --git a/contracts/package.json b/contracts/package.json
index 723f7bf..270275a 100644
--- a/contracts/package.json
+++ b/contracts/package.json
@@ -7,7 +7,7 @@
     "test": "test"
   },
   "dependencies": {
-    "@openzeppelin/contracts": "^2.5.0",
+    "@openzeppelin/contracts": "^4.7.2",
     "@truffle/hdwallet-provider": "^1.0.32",
     "ethers": "^4.0.44",
     "ganache-cli": "^6.9.1",