diff --git a/contracts/NFT.sol b/contracts/NFT.sol
index 9a38a08..62fefaa 100644
--- a/contracts/NFT.sol
+++ b/contracts/NFT.sol
@@ -4,7 +4,7 @@ pragma solidity ^0.8.4;
 
 import "@openzeppelin/contracts/utils/math/SafeMath.sol";
 import "@openzeppelin/contracts/access/Ownable.sol";
-import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
+import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
 
 /**
  * @title NFT
@@ -12,15 +12,18 @@ import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
  *
  * Authors: 0xSimo
  * Created: 01.07.2021
- * Last revision: 22.03.2022: gas optimizations, ERC721Enumerable
+ * Last revision: 22.07.2022: gas optimizations
  */
-contract NFT is ERC721Enumerable, Ownable {
+contract NFT is ERC721, Ownable {
     using SafeMath for uint256;
 
     // The maximum number of tokens, this is just an example
     uint256 public constant MAX_NFT_SUPPLY = 233;
     // The NFT minting price, this is just an example
     uint256 public constant NFT_MINT_PRICE = 0.1 ether;
+    // the (current) total supply
+    uint256 public totalSupply;
+
 
     /**
      * @dev Constructor
@@ -31,16 +34,16 @@ contract NFT is ERC721Enumerable, Ownable {
      * @dev Mint 'numberOfNfts' new tokens
      */
     function mintNFT(uint256 numberOfNfts) public payable {
-        require(totalSupply() <  MAX_NFT_SUPPLY, "Sale has already ended");
+        require(totalSupply <  MAX_NFT_SUPPLY, "Sale has already ended");
         require(numberOfNfts  >  0, "numberOfNfts cannot be 0");
         require(numberOfNfts  <= 20, "You may not buy more than 20 NFTs at once");
-        require(totalSupply().add(numberOfNfts)  <= MAX_NFT_SUPPLY, "Sale has already ended");
+        require(totalSupply.add(numberOfNfts)  <= MAX_NFT_SUPPLY, "Sale has already ended");
         require(NFT_MINT_PRICE.mul(numberOfNfts) == msg.value, "Ether value sent is not correct");
 
         for (uint i = 0; i < numberOfNfts; i++) {
-            uint256 mintIndex = totalSupply();
-            if (mintIndex < MAX_NFT_SUPPLY) {
-                _safeMint(_msgSender(), mintIndex);
+            if (totalSupply < MAX_NFT_SUPPLY) {
+                _mint(_msgSender(), totalSupply);
+                totalSupply += 1; // can be unchecked no overflow here
             }
         }
     }
diff --git a/contracts/UC1.sol b/contracts/UC1.sol
index 585b853..9c42052 100644
--- a/contracts/UC1.sol
+++ b/contracts/UC1.sol
@@ -6,7 +6,7 @@ import "@openzeppelin/contracts/access/Ownable.sol";
 import "@openzeppelin/contracts/utils/Strings.sol";
 import "@openzeppelin/contracts/utils/Base64.sol";
 import "@openzeppelin/contracts/utils/math/SafeMath.sol";
-import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
+import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
 import "./INCT.sol";
 
 /**
@@ -17,9 +17,9 @@ import "./INCT.sol";
  * Authors: 0xSimo
  * Created: 01.07.2021
  * Last revision: 26.07.2021: set name change price already ready for a real example
- *                22.03.2022: on-chain metadata, gas optimizations, ERC721Enumerable
+ *                22.07.2022: gas optimizations
  */
-contract UC1 is ERC721Enumerable, Ownable {
+contract UC1 is ERC721, Ownable {
     using Strings for uint256;
     using SafeMath for uint256;
 
@@ -29,6 +29,8 @@ contract UC1 is ERC721Enumerable, Ownable {
     uint256 public constant NAME_CHANGE_PRICE = 10 * (10 ** 18);
     // The NFT minting price, this is just an example
     uint256 public constant NFT_MINT_PRICE    = 0.1 ether;
+    // the (current) total supply
+    uint256 public totalSupply;
 
     // Mapping from token ID to name
     mapping (uint256 => string) private _tokenName;
@@ -99,16 +101,16 @@ contract UC1 is ERC721Enumerable, Ownable {
      * @dev Mint 'numberOfNfts' new tokens
      */
     function mintNFT(uint256 numberOfNfts) public payable {
-        require(totalSupply() <  MAX_NFT_SUPPLY, "Sale has already ended");
+        require(totalSupply <  MAX_NFT_SUPPLY, "Sale has already ended");
         require(numberOfNfts  >  0, "numberOfNfts cannot be 0");
         require(numberOfNfts  <= 20, "You may not buy more than 20 NFTs at once");
-        require(totalSupply().add(numberOfNfts)  <= MAX_NFT_SUPPLY, "Sale has already ended");
+        require(totalSupply.add(numberOfNfts)  <= MAX_NFT_SUPPLY, "Sale has already ended");
         require(NFT_MINT_PRICE.mul(numberOfNfts) == msg.value, "Ether value sent is not correct");
 
         for (uint i = 0; i < numberOfNfts; i++) {
-            uint256 mintIndex = totalSupply();
-            if (mintIndex < MAX_NFT_SUPPLY) {
-                _safeMint(_msgSender(), mintIndex);
+            if (totalSupply < MAX_NFT_SUPPLY) {
+                _mint(_msgSender(), totalSupply);
+                totalSupply += 1; // can be unchecked no overflow here
             }
         }
     }
diff --git a/package-lock.json b/package-lock.json
index c8991ac..5f17ba3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -306,118 +306,116 @@
       }
     },
     "@ethereumjs/block": {
-      "version": "3.3.0",
-      "resolved": "https://registry.npmjs.org/@ethereumjs/block/-/block-3.3.0.tgz",
-      "integrity": "sha512-WoefY9Rs4W8vZTxG9qwntAlV61xsSv0NPoXmHO7x3SH16dwJQtU15YvahPCz4HEEXbu7GgGgNgu0pv8JY7VauA==",
+      "version": "3.6.3",
+      "resolved": "https://registry.npmjs.org/@ethereumjs/block/-/block-3.6.3.tgz",
+      "integrity": "sha512-CegDeryc2DVKnDkg5COQrE0bJfw/p0v3GBk2W5/Dj5dOVfEmb50Ux0GLnSPypooLnfqjwFaorGuT9FokWB3GRg==",
       "dev": true,
       "requires": {
-        "@ethereumjs/common": "^2.3.0",
-        "@ethereumjs/tx": "^3.2.0",
-        "ethereumjs-util": "^7.0.10",
-        "merkle-patricia-tree": "^4.2.0"
+        "@ethereumjs/common": "^2.6.5",
+        "@ethereumjs/tx": "^3.5.2",
+        "ethereumjs-util": "^7.1.5",
+        "merkle-patricia-tree": "^4.2.4"
       }
     },
     "@ethereumjs/blockchain": {
-      "version": "5.3.1",
-      "resolved": "https://registry.npmjs.org/@ethereumjs/blockchain/-/blockchain-5.3.1.tgz",
-      "integrity": "sha512-Sr39BoTOzmVSnuYzjiCIpgcBUFE5JWcMF0lYCvzrtx/5Lg1tnpZhw9yMQ6JfIomN421epg4oDz99DWlL9Aqz3g==",
+      "version": "5.5.3",
+      "resolved": "https://registry.npmjs.org/@ethereumjs/blockchain/-/blockchain-5.5.3.tgz",
+      "integrity": "sha512-bi0wuNJ1gw4ByNCV56H0Z4Q7D+SxUbwyG12Wxzbvqc89PXLRNR20LBcSUZRKpN0+YCPo6m0XZL/JLio3B52LTw==",
       "dev": true,
       "requires": {
-        "@ethereumjs/block": "^3.3.0",
-        "@ethereumjs/common": "^2.3.1",
-        "@ethereumjs/ethash": "^1.0.0",
-        "debug": "^2.2.0",
-        "ethereumjs-util": "^7.0.10",
+        "@ethereumjs/block": "^3.6.2",
+        "@ethereumjs/common": "^2.6.4",
+        "@ethereumjs/ethash": "^1.1.0",
+        "debug": "^4.3.3",
+        "ethereumjs-util": "^7.1.5",
         "level-mem": "^5.0.1",
         "lru-cache": "^5.1.1",
-        "rlp": "^2.2.4",
         "semaphore-async-await": "^1.5.1"
       },
       "dependencies": {
         "debug": {
-          "version": "2.6.9",
-          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
-          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+          "version": "4.3.4",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
+          "integrity": "sha512-PRWFHuSU3eDtQJPvnNY7Jcket1j0t5OuOsFzPPzsekD52Zl8qUfFIPEiswXqIvHWGVHOgX+7G/vCNNhehwxfkQ==",
           "dev": true,
           "requires": {
-            "ms": "2.0.0"
+            "ms": "2.1.2"
           }
-        },
-        "ms": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
-          "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
-          "dev": true
         }
       }
     },
     "@ethereumjs/common": {
-      "version": "2.3.1",
-      "resolved": "https://registry.npmjs.org/@ethereumjs/common/-/common-2.3.1.tgz",
-      "integrity": "sha512-V8hrULExoq0H4HFs3cCmdRGbgmipmlNzak6Xg34nHYfQyqkSdrCuflvYjyWmsNpI8GtrcZhzifAbgX/1C1Cjwg==",
+      "version": "2.6.5",
+      "resolved": "https://registry.npmjs.org/@ethereumjs/common/-/common-2.6.5.tgz",
+      "integrity": "sha512-lRyVQOeCDaIVtgfbowla32pzeDv2Obr8oR8Put5RdUBNRGr1VGPGQNGP6elWIpgK3YdpzqTOh4GyUGOureVeeA==",
       "dev": true,
       "requires": {
         "crc-32": "^1.2.0",
-        "ethereumjs-util": "^7.0.10"
+        "ethereumjs-util": "^7.1.5"
       }
     },
     "@ethereumjs/ethash": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/@ethereumjs/ethash/-/ethash-1.0.0.tgz",
-      "integrity": "sha512-iIqnGG6NMKesyOxv2YctB2guOVX18qMAWlj3QlZyrc+GqfzLqoihti+cVNQnyNxr7eYuPdqwLQOFuPe6g/uKjw==",
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@ethereumjs/ethash/-/ethash-1.1.0.tgz",
+      "integrity": "sha512-/U7UOKW6BzpA+Vt+kISAoeDie1vAvY4Zy2KF5JJb+So7+1yKmJeJEHOGSnQIj330e9Zyl3L5Nae6VZyh2TJnAA==",
       "dev": true,
       "requires": {
+        "@ethereumjs/block": "^3.5.0",
         "@types/levelup": "^4.3.0",
         "buffer-xor": "^2.0.1",
-        "ethereumjs-util": "^7.0.7",
+        "ethereumjs-util": "^7.1.1",
         "miller-rabin": "^4.0.0"
+      },
+      "dependencies": {
+        "buffer-xor": {
+          "version": "2.0.2",
+          "resolved": "https://registry.npmjs.org/buffer-xor/-/buffer-xor-2.0.2.tgz",
+          "integrity": "sha512-eHslX0bin3GB+Lx2p7lEYRShRewuNZL3fUl4qlVJGGiwoPGftmt8JQgk2Y9Ji5/01TnVDo33E5b5O3vUB1HdqQ==",
+          "dev": true,
+          "requires": {
+            "safe-buffer": "^5.1.1"
+          }
+        }
       }
     },
     "@ethereumjs/tx": {
-      "version": "3.2.1",
-      "resolved": "https://registry.npmjs.org/@ethereumjs/tx/-/tx-3.2.1.tgz",
-      "integrity": "sha512-i9V39OtKvwWos1uVNZxdVhd7zFOyzFLjgt69CoiOY0EmXugS0HjO3uxpLBSglDKFMRriuGqw6ddKEv+RP1UNEw==",
+      "version": "3.5.2",
+      "resolved": "https://registry.npmjs.org/@ethereumjs/tx/-/tx-3.5.2.tgz",
+      "integrity": "sha512-gQDNJWKrSDGu2w7w0PzVXVBNMzb7wwdDOmOqczmhNjqFxFuIbhVJDwiGEnxFNC2/b8ifcZzY7MLcluizohRzNw==",
       "dev": true,
       "requires": {
-        "@ethereumjs/common": "^2.3.1",
-        "ethereumjs-util": "^7.0.10"
+        "@ethereumjs/common": "^2.6.4",
+        "ethereumjs-util": "^7.1.5"
       }
     },
     "@ethereumjs/vm": {
-      "version": "5.4.1",
-      "resolved": "https://registry.npmjs.org/@ethereumjs/vm/-/vm-5.4.1.tgz",
-      "integrity": "sha512-cpQcg5CtjzXJBn8QNiobaiWckeN/ZQwsDHLYa9df2wBEUvzuEZgFWK48YEXSpx3CnUY9fNT/lgA9CzKdq8HTzQ==",
+      "version": "5.9.3",
+      "resolved": "https://registry.npmjs.org/@ethereumjs/vm/-/vm-5.9.3.tgz",
+      "integrity": "sha512-Ha04TeF8goEglr8eL7hkkYyjhzdZS0PsoRURzYlTF6I0VVId5KjKb0N7MrA8GMgheN+UeTncfTgYx52D/WhEmg==",
       "dev": true,
       "requires": {
-        "@ethereumjs/block": "^3.3.0",
-        "@ethereumjs/blockchain": "^5.3.0",
-        "@ethereumjs/common": "^2.3.1",
-        "@ethereumjs/tx": "^3.2.1",
+        "@ethereumjs/block": "^3.6.3",
+        "@ethereumjs/blockchain": "^5.5.3",
+        "@ethereumjs/common": "^2.6.5",
+        "@ethereumjs/tx": "^3.5.2",
         "async-eventemitter": "^0.2.4",
         "core-js-pure": "^3.0.1",
-        "debug": "^2.2.0",
-        "ethereumjs-util": "^7.0.10",
+        "debug": "^4.3.3",
+        "ethereumjs-util": "^7.1.5",
         "functional-red-black-tree": "^1.0.1",
         "mcl-wasm": "^0.7.1",
-        "merkle-patricia-tree": "^4.2.0",
-        "rustbn.js": "~0.2.0",
-        "util.promisify": "^1.0.1"
+        "merkle-patricia-tree": "^4.2.4",
+        "rustbn.js": "~0.2.0"
       },
       "dependencies": {
         "debug": {
-          "version": "2.6.9",
-          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
-          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+          "version": "4.3.4",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
+          "integrity": "sha512-PRWFHuSU3eDtQJPvnNY7Jcket1j0t5OuOsFzPPzsekD52Zl8qUfFIPEiswXqIvHWGVHOgX+7G/vCNNhehwxfkQ==",
           "dev": true,
           "requires": {
-            "ms": "2.0.0"
+            "ms": "2.1.2"
           }
-        },
-        "ms": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
-          "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
-          "dev": true
         }
       }
     },
@@ -827,6 +825,80 @@
         "@ethersproject/strings": "^5.4.0"
       }
     },
+    "@metamask/eth-sig-util": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/@metamask/eth-sig-util/-/eth-sig-util-4.0.1.tgz",
+      "integrity": "sha512-tghyZKLHZjcdlDqCA3gNZmLeR0XvOE9U1qoQO9ohyAZT6Pya+H9vkBPcsyXytmYLNgVoin7CKCmweo/R43V+tQ==",
+      "dev": true,
+      "requires": {
+        "ethereumjs-abi": "^0.6.8",
+        "ethereumjs-util": "^6.2.1",
+        "ethjs-util": "^0.1.6",
+        "tweetnacl": "^1.0.3",
+        "tweetnacl-util": "^0.15.1"
+      },
+      "dependencies": {
+        "@types/bn.js": {
+          "version": "4.11.6",
+          "resolved": "https://registry.npmjs.org/@types/bn.js/-/bn.js-4.11.6.tgz",
+          "integrity": "sha512-pqr857jrp2kPuO9uRjZ3PwnJTjoQy+fcdxvBTvHm6dkmEL9q+hDD/2j/0ELOBPtPnS8LjCX0gI9nbl8lVkadpg==",
+          "dev": true,
+          "requires": {
+            "@types/node": "*"
+          }
+        },
+        "ethereum-cryptography": {
+          "version": "0.1.3",
+          "resolved": "https://registry.npmjs.org/ethereum-cryptography/-/ethereum-cryptography-0.1.3.tgz",
+          "integrity": "sha512-w8/4x1SGGzc+tO97TASLja6SLd3fRIK2tLVcV2Gx4IB21hE19atll5Cq9o3d0ZmAYC/8aw0ipieTSiekAea4SQ==",
+          "dev": true,
+          "requires": {
+            "@types/pbkdf2": "^3.0.0",
+            "@types/secp256k1": "^4.0.1",
+            "blakejs": "^1.1.0",
+            "browserify-aes": "^1.2.0",
+            "bs58check": "^2.1.2",
+            "create-hash": "^1.2.0",
+            "create-hmac": "^1.1.7",
+            "hash.js": "^1.1.7",
+            "keccak": "^3.0.0",
+            "pbkdf2": "^3.0.17",
+            "randombytes": "^2.1.0",
+            "safe-buffer": "^5.1.2",
+            "scrypt-js": "^3.0.0",
+            "secp256k1": "^4.0.1",
+            "setimmediate": "^1.0.5"
+          }
+        },
+        "ethereumjs-util": {
+          "version": "6.2.1",
+          "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-6.2.1.tgz",
+          "integrity": "sha512-W2Ktez4L01Vexijrm5EB6w7dg4n/TgpoYU4avuT5T3Vmnw/eCRtiBrJfQYS/DCSvDIOLn2k57GcHdeBcgVxAqw==",
+          "dev": true,
+          "requires": {
+            "@types/bn.js": "^4.11.3",
+            "bn.js": "^4.11.0",
+            "create-hash": "^1.1.2",
+            "elliptic": "^6.5.2",
+            "ethereum-cryptography": "^0.1.3",
+            "ethjs-util": "0.1.6",
+            "rlp": "^2.2.3"
+          }
+        }
+      }
+    },
+    "@noble/hashes": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@noble/hashes/-/hashes-1.1.2.tgz",
+      "integrity": "sha512-KYRCASVTv6aeUi1tsF8/vpyR7zpfs3FUzy2Jqm+MU+LmUKhQ0y2FpfwqkCcxSg2ua4GALJd8k2R76WxwZGbQpA==",
+      "dev": true
+    },
+    "@noble/secp256k1": {
+      "version": "1.6.3",
+      "resolved": "https://registry.npmjs.org/@noble/secp256k1/-/secp256k1-1.6.3.tgz",
+      "integrity": "sha512-T04e4iTurVy7I8Sw4+c5OSN9/RkPlo1uKxAomtxQNLq8j1uPAqnsqG1bqvY3Jv7c13gyr6dui0zmh/I3+f/JaQ==",
+      "dev": true
+    },
     "@nomiclabs/hardhat-ethers": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/@nomiclabs/hardhat-ethers/-/hardhat-ethers-2.0.2.tgz",
@@ -859,9 +931,9 @@
       }
     },
     "@openzeppelin/contracts": {
-      "version": "4.5.0",
-      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-4.5.0.tgz",
-      "integrity": "sha512-fdkzKPYMjrRiPK6K4y64e6GzULR7R7RwxSigHS8DDp7aWDeoReqsQI+cxHV1UuhAqX69L1lAaWDxenfP+xiqzA==",
+      "version": "4.7.1",
+      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-4.7.1.tgz",
+      "integrity": "sha512-UXmAjKARsXORHlHZu5GCD7ZbRKm6nU8UHnbuT/QJJa2JEOEcbvV/X8w/sUk62Sl9VZuuljM1akrZLyAtzUgsxw==",
       "dev": true
     },
     "@resolver-engine/core": {
@@ -953,6 +1025,33 @@
         }
       }
     },
+    "@scure/base": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/@scure/base/-/base-1.1.1.tgz",
+      "integrity": "sha512-ZxOhsSyxYwLJj3pLZCefNitxsj093tb2vq90mp2txoYeBqbcjDjqFhyM8eUjq/uFm6zJ+mUuqxlS2FkuSY1MTA==",
+      "dev": true
+    },
+    "@scure/bip32": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@scure/bip32/-/bip32-1.1.0.tgz",
+      "integrity": "sha512-ftTW3kKX54YXLCxH6BB7oEEoJfoE2pIgw7MINKAs5PsS6nqKPuKk1haTF/EuHmYqG330t5GSrdmtRuHaY1a62Q==",
+      "dev": true,
+      "requires": {
+        "@noble/hashes": "~1.1.1",
+        "@noble/secp256k1": "~1.6.0",
+        "@scure/base": "~1.1.0"
+      }
+    },
+    "@scure/bip39": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@scure/bip39/-/bip39-1.1.0.tgz",
+      "integrity": "sha512-pwrPOS16VeTKg98dYXQyIjJEcWfz7/1YJIwxUEPFfQPtc86Ym/1sVgQ2RLoD43AazMk2l/unK4ITySSpW2+82w==",
+      "dev": true,
+      "requires": {
+        "@noble/hashes": "~1.1.1",
+        "@scure/base": "~1.1.0"
+      }
+    },
     "@sentry/core": {
       "version": "5.30.0",
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@@ -1053,10 +1152,13 @@
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+        "ansi-styles": {
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+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
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-            "emoji-regex": "^7.0.1",
-            "is-fullwidth-code-point": "^2.0.0",
-            "strip-ansi": "^5.1.0"
+            "color-convert": "^2.0.1"
           }
         },
-        "strip-ansi": {
-          "version": "5.2.0",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
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+        "color-convert": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
+          "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
           "dev": true,
           "requires": {
-            "ansi-regex": "^4.1.0"
+            "color-name": "~1.1.4"
           }
+        },
+        "color-name": {
+          "version": "1.1.4",
+          "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
+          "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
+          "dev": true
         }
       }
     },
@@ -14458,9 +15537,9 @@
       "dev": true
     },
     "ws": {
-      "version": "7.5.1",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-7.5.1.tgz",
-      "integrity": "sha512-2c6faOUH/nhoQN6abwMloF7Iyl0ZS2E9HGtsiLrWn0zOOMWlhtDmdf/uihDt6jnuCxgtwGBNy6Onsoy2s2O2Ow==",
+      "version": "7.5.9",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-7.5.9.tgz",
+      "integrity": "sha512-F+P9Jil7UiSKSkppIiD94dN07AwvFixvLIj1Og1Rl9GGMuNipJnV9JzjD6XuqmAeiswGvUmNLjr5cFuXwNS77Q==",
       "dev": true
     },
     "xhr": {
@@ -14502,7 +15581,7 @@
     "xmlhttprequest": {
       "version": "1.8.0",
       "resolved": "https://registry.npmjs.org/xmlhttprequest/-/xmlhttprequest-1.8.0.tgz",
-      "integrity": "sha1-Z/4HXFwk/vOfnWX197f+dRcZaPw=",
+      "integrity": "sha512-58Im/U0mlVBLM38NdZjHyhuMtCqa61469k2YP/AaPbvCoV9aQGUpbJBj1QRm2ytRiVQBD/fsw7L2bJGDVQswBA==",
       "dev": true
     },
     "xtend": {
@@ -14512,9 +15591,9 @@
       "dev": true
     },
     "y18n": {
-      "version": "4.0.3",
-      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.3.tgz",
-      "integrity": "sha512-JKhqTOwSrqNA1NY5lSztJ1GrBiUodLMmIZuLiDaMRJ+itFd+ABVE8XBjOvIWL+rSqNDC74LCSFmlb/U4UZ4hJQ==",
+      "version": "5.0.8",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
+      "integrity": "sha512-0pfFzegeDWJHJIAmTLRP2DwHjdF5s7jo9tuztdQxAhINCdvS+3nGINqPd00AphqJR/0LhANUS6/+7SCb98YOfA==",
       "dev": true
     },
     "yallist": {
@@ -14524,114 +15603,57 @@
       "dev": true
     },
     "yargs": {
-      "version": "13.3.2",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.2.tgz",
-      "integrity": "sha512-AX3Zw5iPruN5ie6xGRIDgqkT+ZhnRlZMLMHAs8tg7nRruy2Nb+i5o9bwghAogtM08q1dpr2LVoS8KSTMYpWXUw==",
+      "version": "16.2.0",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-16.2.0.tgz",
+      "integrity": "sha512-D1mvvtDG0L5ft/jGWkLpG1+m0eQxOfaBvTNELraWj22wSVUMWxZUvYgJYcKh6jGGIkJFhH4IZPQhR4TKpc8mBw==",
       "dev": true,
       "requires": {
-        "cliui": "^5.0.0",
-        "find-up": "^3.0.0",
-        "get-caller-file": "^2.0.1",
+        "cliui": "^7.0.2",
+        "escalade": "^3.1.1",
+        "get-caller-file": "^2.0.5",
         "require-directory": "^2.1.1",
-        "require-main-filename": "^2.0.0",
-        "set-blocking": "^2.0.0",
-        "string-width": "^3.0.0",
-        "which-module": "^2.0.0",
-        "y18n": "^4.0.0",
-        "yargs-parser": "^13.1.2"
-      },
-      "dependencies": {
-        "ansi-regex": {
-          "version": "4.1.0",
-          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
-          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
-          "dev": true
-        },
-        "find-up": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
-          "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
-          "dev": true,
-          "requires": {
-            "locate-path": "^3.0.0"
-          }
-        },
-        "locate-path": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
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-          "requires": {
-            "p-locate": "^3.0.0",
-            "path-exists": "^3.0.0"
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-        "p-limit": {
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-        "p-locate": {
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-          "dev": true,
-          "requires": {
-            "emoji-regex": "^7.0.1",
-            "is-fullwidth-code-point": "^2.0.0",
-            "strip-ansi": "^5.1.0"
-          }
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-        "strip-ansi": {
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-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
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-          "requires": {
-            "ansi-regex": "^4.1.0"
-          }
-        }
+        "string-width": "^4.2.0",
+        "y18n": "^5.0.5",
+        "yargs-parser": "^20.2.2"
       }
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-      "version": "13.1.2",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
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-      "requires": {
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-        "decamelize": "^1.2.0"
-      }
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+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.2.4.tgz",
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+      "dev": true
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-      "version": "1.6.0",
-      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.6.0.tgz",
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+      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-2.0.0.tgz",
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       "dev": true,
       "requires": {
-        "flat": "^4.1.0",
-        "lodash": "^4.17.15",
-        "yargs": "^13.3.0"
+        "camelcase": "^6.0.0",
+        "decamelize": "^4.0.0",
+        "flat": "^5.0.2",
+        "is-plain-obj": "^2.1.0"
+      },
+      "dependencies": {
+        "decamelize": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-4.0.0.tgz",
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+          "dev": true
+        }
       }
+    },
+    "yocto-queue": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
+      "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==",
+      "dev": true
+    },
+    "zksync-web3": {
+      "version": "0.7.9",
+      "resolved": "https://registry.npmjs.org/zksync-web3/-/zksync-web3-0.7.9.tgz",
+      "integrity": "sha512-B0pitKvEQGJuWkY2UWjXrL1YgHghXEoDaq6acVZnB62TRF099GV58Fzi7Fnqt+Nw14A7Wc9iJ2AHD4GBTLFgkg==",
+      "dev": true
     }
   }
 }
diff --git a/package.json b/package.json
index f1c2752..232cb24 100644
--- a/package.json
+++ b/package.json
@@ -10,6 +10,7 @@
   },
   "keywords": [
     "NCT",
+    "ERC721",
     "HashMasks"
   ],
   "author": "0xSimo",
@@ -18,13 +19,13 @@
     "@nomiclabs/hardhat-ethers": "^2.0.2",
     "@nomiclabs/hardhat-etherscan": "^2.1.4",
     "@nomiclabs/hardhat-waffle": "^2.0.1",
-    "@openzeppelin/contracts": "^4.5.0",
+    "@openzeppelin/contracts": "^4.7.1",
     "chai": "^4.3.4",
     "dotenv": "^10.0.0",
     "ethereum-waffle": "^3.4.0",
     "ethers": "^5.4.0",
-    "hardhat": "^2.4.1",
-    "hardhat-deploy": "^0.8.11",
-    "hardhat-gas-reporter": "^1.0.4"
+    "hardhat": "^2.10.1",
+    "hardhat-deploy": "^0.11.11",
+    "hardhat-gas-reporter": "^1.0.8"
   }
 }
diff --git a/test/NFT.js b/test/NFT.js
index c43d35e..92d32cb 100644
--- a/test/NFT.js
+++ b/test/NFT.js
@@ -75,7 +75,7 @@ describe('NFT contract', () => {
         it('not owner transfer 1 token', async () => {
             await expect(
                 nft.connect(addr2).transferFrom(owner.address, addr1.address, 0)
-            ).to.be.revertedWith("ERC721: transfer caller is not owner nor approved");
+            ).to.be.revertedWith("ERC721: caller is not token owner nor approved");
         });
 
         it('not owner transfer 1 token with approval', async () => {