diff --git a/package-lock.json b/package-lock.json
index 6cbad63..9867be9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -203,9 +203,9 @@
       }
     },
     "@openzeppelin/contracts": {
-      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-3.1.0.tgz",
-      "integrity": "sha512-dVXDnUKxrAKLzPdCRkz+N8qsVkK1XxJ6kk3zuI6zaQmcKxN7CkizoDP7lXxcs/Mi2I0mxceTRjJBqlzFffLJrQ=="
+      "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/package.json b/package.json
index f1f5154..2413360 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
   "dependencies": {
     "@ensdomains/ens": "^0.4.5",
     "@ensdomains/resolver": "^0.2.4",
-    "@openzeppelin/contracts": "^3.1.0",
+    "@openzeppelin/contracts": "^4.7.2",
     "@truffle/hdwallet-provider": "^1.0.42",
     "fs": "0.0.1-security",
     "npm-run-all": "^4.1.5",