diff --git a/package-lock.json b/package-lock.json
index ee68f9d..fe969bd 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -36,9 +36,9 @@
       }
     },
     "@openzeppelin/contracts": {
-      "version": "2.4.0",
-      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-2.4.0.tgz",
-      "integrity": "sha512-xeKP59REgow5TPBJh3S9BRIm7DDG+Rz3Nt4ANWGUkjk4305DHpyUD5CyMJ6nd2JMmZuFyx4mjvvlCtSJLRnN6w==",
+      "version": "4.7.2",
+      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-4.7.2.tgz",
+      "integrity": "sha512-4n/JL9izql8303mPqPdubuna/DWEMbmOzWYUWyCPhjhiEr2w3nQrjE7vZz1fBF+wzzP6dZbIcsgqACk53c9FGA==",
       "dev": true
     },
     "@resolver-engine/core": {
diff --git a/package.json b/package.json
index b09b35a..06b1c96 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
     "test": "NODE_ENV=test mocha --require ts-node/register --extension 'test.ts' './test/**/*.test.ts' --exit"
   },
   "devDependencies": {
-    "@openzeppelin/contracts": "^2.4.0",
+    "@openzeppelin/contracts": "^4.7.2",
     "@types/chai": "^4.2.7",
     "@types/mocha": "^5.2.7",
     "chai": "^4.2.0",