diff --git a/package-lock.json b/package-lock.json
index e804af4..24f96c8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -360,9 +360,9 @@
       }
     },
     "@openzeppelin/contracts": {
-      "version": "2.5.1",
-      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-2.5.1.tgz",
-      "integrity": "sha512-qIy6tLx8rtybEsIOAlrM4J/85s2q2nPkDqj/Rx46VakBZ0LwtFhXIVub96LXHczQX0vaqmAueDqNPXtbSXSaYQ=="
+      "version": "4.7.2",
+      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-4.7.2.tgz",
+      "integrity": "sha512-4n/JL9izql8303mPqPdubuna/DWEMbmOzWYUWyCPhjhiEr2w3nQrjE7vZz1fBF+wzzP6dZbIcsgqACk53c9FGA=="
     },
     "@openzeppelin/test-helpers": {
       "version": "0.5.10",
diff --git a/package.json b/package.json
index 479141b..d067851 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,7 @@
   "dependencies": {
     "@eth-optimism/solc": "0.5.16-alpha.7",
     "@metis.io/solc": "^0.6.12-alpha.2",
-    "@openzeppelin/contracts": "^2.5.1",
+    "@openzeppelin/contracts": "^4.7.2",
     "@openzeppelin/test-helpers": "^0.5.10",
     "@umaprotocol/truffle-ledger-provider": "^1.0.5",
     "bignumber": "^1.1.0",