diff --git a/package-lock.json b/package-lock.json
index 10530f5..7aca780 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "etherless-smart",
-  "version": "1.0.0",
+  "version": "2.0.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -1049,9 +1049,9 @@
       }
     },
     "@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==",
       "dev": true
     },
     "@openzeppelin/contracts-ethereum-package": {
diff --git a/package.json b/package.json
index eb8344f..03850b2 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,7 @@
   },
   "devDependencies": {
     "@openzeppelin/cli": "^2.8.2",
-    "@openzeppelin/contracts": "^3.0.1",
+    "@openzeppelin/contracts": "^4.7.2",
     "@openzeppelin/test-helpers": "^0.5.6",
     "@openzeppelin/upgrades": "^2.8.0",
     "solidity-coverage": "^0.7.5"