diff --git a/package-lock.json b/package-lock.json
index f149360..bc0b176 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,7 +9,7 @@
          "version": "1.0.0",
          "dependencies": {
             "@chainsafe/truffle-plugin-abigen": "^0.0.2",
-            "@openzeppelin/contracts": "^3.2.2-solc-0.7",
+            "@openzeppelin/contracts": "^4.4.2",
             "@truffle/contract": "^4.4.2",
             "@truffle/hdwallet-provider": "=1.2.2",
             "moonbeam-truffle-plugin": ">=1.4.0",
@@ -1586,9 +1586,9 @@
          "optional": true
       },
       "node_modules/@openzeppelin/contracts": {
-         "version": "3.4.2",
-         "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-3.4.2.tgz",
-         "integrity": "sha512-z0zMCjyhhp4y7XKAcDAi3Vgms4T2PstwBdahiO0+9NaGICQKjynK3wduSRplTgk4LXmoO1yfDGO5RbjKYxtuxA=="
+         "version": "4.4.2",
+         "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-4.4.2.tgz",
+         "integrity": "sha512-NyJV7sJgoGYqbtNUWgzzOGW4T6rR19FmX1IJgXGdapGPWsuMelGJn9h03nos0iqfforCbCB0iYIR0MtIuIFLLw=="
       },
       "node_modules/@protobufjs/aspromise": {
          "version": "1.1.2",
@@ -6765,6 +6765,7 @@
          "version": "0.4.1",
          "resolved": "https://registry.npmjs.org/emittery/-/emittery-0.4.1.tgz",
          "integrity": "sha512-r4eRSeStEGf6M5SKdrQhhLK5bOwOBxQhIE3YSTnZE3GpKiLfnnhE+tPtrJE79+eDJgm39BM6LSoI8SCx4HbwlQ==",
+         "optional": true,
          "engines": {
             "node": ">=6"
          }
@@ -8299,7 +8300,8 @@
       "node_modules/fast-future": {
          "version": "1.0.2",
          "resolved": "https://registry.npmjs.org/fast-future/-/fast-future-1.0.2.tgz",
-         "integrity": "sha1-hDWpqqAteSSNF9cE52JZMB2ZKAo="
+         "integrity": "sha1-hDWpqqAteSSNF9cE52JZMB2ZKAo=",
+         "optional": true
       },
       "node_modules/fast-json-stable-stringify": {
          "version": "2.1.0",
@@ -13288,6 +13290,7 @@
          "version": "2.0.1",
          "resolved": "https://registry.npmjs.org/level-concat-iterator/-/level-concat-iterator-2.0.1.tgz",
          "integrity": "sha512-OTKKOqeav2QWcERMJR7IS9CUo1sHnke2C0gkSmcR7QuEtFNLLzHQAvnMw8ykvEcv0Qtkg0p7FOwP1v9e5Smdcw==",
+         "optional": true,
          "engines": {
             "node": ">=6"
          }
@@ -13534,6 +13537,7 @@
          "resolved": "https://registry.npmjs.org/leveldown/-/leveldown-5.0.2.tgz",
          "integrity": "sha512-Ib6ygFYBleS8x2gh3C1AkVsdrUShqXpe6jSTnZ6sRycEXKhqVf+xOSkhgSnjidpPzyv0d95LJVFrYQ4NuXAqHA==",
          "hasInstallScript": true,
+         "optional": true,
          "dependencies": {
             "abstract-leveldown": "~6.0.0",
             "fast-future": "~1.0.2",
@@ -13548,6 +13552,7 @@
          "version": "6.0.3",
          "resolved": "https://registry.npmjs.org/abstract-leveldown/-/abstract-leveldown-6.0.3.tgz",
          "integrity": "sha512-jzewKKpZbaYUa6HTThnrl+GrJhzjEAeuc7hTVpZdzg7kupXZFoqQDFwyOwLNbmJKJlmzw8yiipMPkDiuKkT06Q==",
+         "optional": true,
          "dependencies": {
             "level-concat-iterator": "~2.0.0",
             "xtend": "~4.0.0"
@@ -13560,6 +13565,7 @@
          "version": "3.8.0",
          "resolved": "https://registry.npmjs.org/node-gyp-build/-/node-gyp-build-3.8.0.tgz",
          "integrity": "sha512-bYbpIHyRqZ7sVWXxGpz8QIRug5JZc/hzZH4GbdT9HTZi6WmKCZ8GLvP8OZ9TTiIBvwPFKgtGrlWQSXDAvYdsPw==",
+         "optional": true,
          "bin": {
             "node-gyp-build": "bin.js",
             "node-gyp-build-optional": "optional.js",
@@ -15415,7 +15421,8 @@
       "node_modules/napi-macros": {
          "version": "1.8.2",
          "resolved": "https://registry.npmjs.org/napi-macros/-/napi-macros-1.8.2.tgz",
-         "integrity": "sha512-Tr0DNY4RzTaBG2W2m3l7ZtFuJChTH6VZhXVhkGGjF/4cZTt+i8GcM9ozD+30Lmr4mDoZ5Xx34t2o4GJqYWDGcg=="
+         "integrity": "sha512-Tr0DNY4RzTaBG2W2m3l7ZtFuJChTH6VZhXVhkGGjF/4cZTt+i8GcM9ozD+30Lmr4mDoZ5Xx34t2o4GJqYWDGcg==",
+         "optional": true
       },
       "node_modules/native-abort-controller": {
          "version": "1.0.4",
@@ -25035,9 +25042,9 @@
          "optional": true
       },
       "@openzeppelin/contracts": {
-         "version": "3.4.2",
-         "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-3.4.2.tgz",
-         "integrity": "sha512-z0zMCjyhhp4y7XKAcDAi3Vgms4T2PstwBdahiO0+9NaGICQKjynK3wduSRplTgk4LXmoO1yfDGO5RbjKYxtuxA=="
+         "version": "4.4.2",
+         "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-4.4.2.tgz",
+         "integrity": "sha512-NyJV7sJgoGYqbtNUWgzzOGW4T6rR19FmX1IJgXGdapGPWsuMelGJn9h03nos0iqfforCbCB0iYIR0MtIuIFLLw=="
       },
       "@protobufjs/aspromise": {
          "version": "1.1.2",
@@ -29518,7 +29525,8 @@
       "emittery": {
          "version": "0.4.1",
          "resolved": "https://registry.npmjs.org/emittery/-/emittery-0.4.1.tgz",
-         "integrity": "sha512-r4eRSeStEGf6M5SKdrQhhLK5bOwOBxQhIE3YSTnZE3GpKiLfnnhE+tPtrJE79+eDJgm39BM6LSoI8SCx4HbwlQ=="
+         "integrity": "sha512-r4eRSeStEGf6M5SKdrQhhLK5bOwOBxQhIE3YSTnZE3GpKiLfnnhE+tPtrJE79+eDJgm39BM6LSoI8SCx4HbwlQ==",
+         "optional": true
       },
       "emoji-regex": {
          "version": "8.0.0",
@@ -30868,7 +30876,8 @@
       "fast-future": {
          "version": "1.0.2",
          "resolved": "https://registry.npmjs.org/fast-future/-/fast-future-1.0.2.tgz",
-         "integrity": "sha1-hDWpqqAteSSNF9cE52JZMB2ZKAo="
+         "integrity": "sha1-hDWpqqAteSSNF9cE52JZMB2ZKAo=",
+         "optional": true
       },
       "fast-json-stable-stringify": {
          "version": "2.1.0",
@@ -34850,7 +34859,8 @@
       "level-concat-iterator": {
          "version": "2.0.1",
          "resolved": "https://registry.npmjs.org/level-concat-iterator/-/level-concat-iterator-2.0.1.tgz",
-         "integrity": "sha512-OTKKOqeav2QWcERMJR7IS9CUo1sHnke2C0gkSmcR7QuEtFNLLzHQAvnMw8ykvEcv0Qtkg0p7FOwP1v9e5Smdcw=="
+         "integrity": "sha512-OTKKOqeav2QWcERMJR7IS9CUo1sHnke2C0gkSmcR7QuEtFNLLzHQAvnMw8ykvEcv0Qtkg0p7FOwP1v9e5Smdcw==",
+         "optional": true
       },
       "level-errors": {
          "version": "1.0.5",
@@ -35071,6 +35081,7 @@
          "version": "5.0.2",
          "resolved": "https://registry.npmjs.org/leveldown/-/leveldown-5.0.2.tgz",
          "integrity": "sha512-Ib6ygFYBleS8x2gh3C1AkVsdrUShqXpe6jSTnZ6sRycEXKhqVf+xOSkhgSnjidpPzyv0d95LJVFrYQ4NuXAqHA==",
+         "optional": true,
          "requires": {
             "abstract-leveldown": "~6.0.0",
             "fast-future": "~1.0.2",
@@ -35082,6 +35093,7 @@
                "version": "6.0.3",
                "resolved": "https://registry.npmjs.org/abstract-leveldown/-/abstract-leveldown-6.0.3.tgz",
                "integrity": "sha512-jzewKKpZbaYUa6HTThnrl+GrJhzjEAeuc7hTVpZdzg7kupXZFoqQDFwyOwLNbmJKJlmzw8yiipMPkDiuKkT06Q==",
+               "optional": true,
                "requires": {
                   "level-concat-iterator": "~2.0.0",
                   "xtend": "~4.0.0"
@@ -35090,7 +35102,8 @@
             "node-gyp-build": {
                "version": "3.8.0",
                "resolved": "https://registry.npmjs.org/node-gyp-build/-/node-gyp-build-3.8.0.tgz",
-               "integrity": "sha512-bYbpIHyRqZ7sVWXxGpz8QIRug5JZc/hzZH4GbdT9HTZi6WmKCZ8GLvP8OZ9TTiIBvwPFKgtGrlWQSXDAvYdsPw=="
+               "integrity": "sha512-bYbpIHyRqZ7sVWXxGpz8QIRug5JZc/hzZH4GbdT9HTZi6WmKCZ8GLvP8OZ9TTiIBvwPFKgtGrlWQSXDAvYdsPw==",
+               "optional": true
             }
          }
       },
@@ -36608,7 +36621,8 @@
       "napi-macros": {
          "version": "1.8.2",
          "resolved": "https://registry.npmjs.org/napi-macros/-/napi-macros-1.8.2.tgz",
-         "integrity": "sha512-Tr0DNY4RzTaBG2W2m3l7ZtFuJChTH6VZhXVhkGGjF/4cZTt+i8GcM9ozD+30Lmr4mDoZ5Xx34t2o4GJqYWDGcg=="
+         "integrity": "sha512-Tr0DNY4RzTaBG2W2m3l7ZtFuJChTH6VZhXVhkGGjF/4cZTt+i8GcM9ozD+30Lmr4mDoZ5Xx34t2o4GJqYWDGcg==",
+         "optional": true
       },
       "native-abort-controller": {
          "version": "1.0.4",
diff --git a/package.json b/package.json
index 02922f9..68efbc0 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
    "version": "1.0.0",
    "dependencies": {
       "@chainsafe/truffle-plugin-abigen": "^0.0.2",
-      "@openzeppelin/contracts": "^3.2.2-solc-0.7",
+      "@openzeppelin/contracts": "^4.4.2",
       "@truffle/contract": "^4.4.2",
       "@truffle/hdwallet-provider": "=1.2.2",
       "moonbeam-truffle-plugin": ">=1.4.0",