diff --git a/package-lock.json b/package-lock.json
index da1e066..8462336 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1438,9 +1438,9 @@
       }
     },
     "@openzeppelin/contracts": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-3.2.0.tgz",
-      "integrity": "sha512-bUOmkSoPkjnUyMiKo6RYnb0VHBk5D9KKDAgNLzF41aqAM3TeE0yGdFF5dVRcV60pZdJLlyFT/jjXIZCWyyEzAQ=="
+      "version": "4.7.2",
+      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-4.7.2.tgz",
+      "integrity": "sha512-4n/JL9izql8303mPqPdubuna/DWEMbmOzWYUWyCPhjhiEr2w3nQrjE7vZz1fBF+wzzP6dZbIcsgqACk53c9FGA=="
     },
     "@openzeppelin/contracts-ethereum-package": {
       "version": "3.0.0",
diff --git a/package.json b/package.json
index 44e9f43..52dc36c 100644
--- a/package.json
+++ b/package.json
@@ -40,7 +40,7 @@
     "web3": "^1.3.0"
   },
   "dependencies": {
-    "@openzeppelin/contracts": "^3.2.0",
+    "@openzeppelin/contracts": "^4.7.2",
     "@uniswap/lib": "^2.1.0",
     "@uniswap/v2-core": "^1.0.1",
     "buidler-source-descriptor": "0.0.15-rc",