diff --git a/package-lock.json b/package-lock.json
index c9c73ca..0cdc361 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -508,9 +508,9 @@
       }
     },
     "@openzeppelin/contracts": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-3.0.1.tgz",
-      "integrity": "sha512-uSrD7hZ0ViuHGqHZbeHawZBi/uy7aBiNramXAt2dFFuSuoU4u9insS3V3zdVfOnYSPreUo636xSOuQIFN4//HA=="
+      "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 a0ceabb..63d027e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "dependencies": {
-        "@openzeppelin/contracts": "3.0.1",
+        "@openzeppelin/contracts": "4.7.2",
         "@truffle/contract": "^4.2.27",
         "@truffle/hdwallet-provider": "^1.1.0",
         "bignumber.js": "9.0.0",