diff --git a/.gitignore b/.gitignore
index 1e09fce..560b2fb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,4 +5,6 @@ cache
 artifacts
 .env
 .openzeppelin
-package-lock.json
\ No newline at end of file
+package-lock.json
+coverage.json
+coverage
\ No newline at end of file
diff --git a/README.md b/README.md
index ce0cf59..f9dab49 100644
--- a/README.md
+++ b/README.md
@@ -1,12 +1,12 @@
 # Openzeppelin upgradable smart-contract example
 
-Deploy upgradable smart contract using Openzeppelin on Polygon test network
+Deploy upgradable smart contract using Openzeppelin on local test network OR polygon test network. This example uses `Transparent Proxy` approach for deploying upgradeable smart contract.
 
 **Commands to create a new project using Hardhat**
 
 1. `mkdir openzeppelin_upgradable_sc`
 
-2. `cd hardhat_polygon_nft`
+2. `cd openzeppelin_upgradable_sc`
 
 3. `npm init --yes`
 
@@ -14,13 +14,21 @@ Deploy upgradable smart contract using Openzeppelin on Polygon test network
 
 5. `npx hardhat`
 
-6. Create an `.env` file and add the private-key and rpc api-key in this file. we require these keys for configuring hardhat.config.js file.
+6. Create an `.env` file by renaming `env.example` to `.env` and add the private-key and rpc api-key in this file. we require these keys for configuring hardhat.config.js file. please note that private-key and rpc api-key is only needed when using polygon_test network.
 
 7. Please add this `.env` file to `.gitignore` to avoid putting private information to github.
 
-8. Install `npm i dotenv` package to use the environment variables from `.env` file
+8. Install `npm i dotenv` package to use the environment variables from `.env` file.
 
-9. Since we are using openzeppelin then we have to add some plugins.
+9. We can add more plugins like `hardhat-gas-reporter`, `solidity-coverage` and `hardhat-solhint` using below commands.
+
+    A. `npm install hardhat-gas-reporter --save-dev`. For more info please refer [documentation](https://hardhat.org/plugins/hardhat-gas-reporter.html)
+
+    B. `npm install solidity-coverage --save-dev`. For more info please refer [documentation](https://hardhat.org/plugins/solidity-coverage.html)
+
+    C. `npm install @nomiclabs/hardhat-solhint --save-dev`. For more info please refer [documentation](https://hardhat.org/plugins/nomiclabs-hardhat-solhint.html).
+
+10. Since we are using openzeppelin then we have to add some plugins.
 
     A. `npm install @openzeppelin/contracts`
     
@@ -38,41 +46,23 @@ Deploy upgradable smart contract using Openzeppelin on Polygon test network
 
 **Deploy Project**
 
-***WARNING:*** This section requires some changes after the recent changes in the code.
+***WARNING:*** There is some issue with Polygon rpc testnet endpoints. They are not responding well when deploying the upgradeable smart-contract.
 
-1. Deploying `deployProxy` [script](https://github.com/prayagsingh/openzeppelin_upgrdabale_sc/blob/main/scripts/deployProxy_box.js) using command `npx hardhat run --network polygon_test scripts/deployProxy_box.js`. please note down the address. we will use it in Step `2.C`.
+1. Open a new terminal and start a hardhat local node using command `npx hardhat node`.
 
-2. Now interact with `Box` contract by using `Hardhat-console`. Please follow below steps.
+2. Deploying `deployProxy` [script](https://github.com/prayagsingh/openzeppelin_upgrdabale_sc/blob/main/scripts/deployProxy_box.js) using command `npx hardhat run --network localhost scripts/deployProxy_box.js`. please note down the address.
 
-    A. `npx hardhat console --network polygon_test`
-    
-    B. `const Box = await ethers.getContractFactory('Box');`
-    
-    C. `const box = await Box.attach('<the address of our proxy contract from when we deployed our Box contract>');`
-    
-    D. `(await box.retrieve()).toString();` Result shoud be `42`. 
+3. Lets test the above smart-contract but first lets update the contract address [here](https://github.com/prayagsingh/openzeppelin_upgrdabale_sc/blob/71287be9032d9f57b1ac9e6663e76adee90137c4/scripts/execute_boxv1_func.js#L15) in `execute_boxv1_func.js` script. Now let's deploy the script using command `npx hardhat run scripts/execute_boxv1_func.js --network localhost`. It will return `13` as a value.
 
-3. Now it's time to deploy `BoxV2` smart-contract which contains additional functionality  when compared to `Box` smart-contract.
+4. Now it's time to deploy `BoxV2` smart-contract which contains additional functionality  when compared to `Box` smart-contract.
 
-4. We will be using `upgradeProxy` [script](https://github.com/prayagsingh/openzeppelin_upgrdabale_sc/blob/main/scripts/upgradeProxy_box.js) for this operation. But before deploying this script please make sure to replace the address [here](https://github.com/prayagsingh/openzeppelin_upgrdabale_sc/blob/7473f927600b716cb9265d3e5dc95d939521781b/scripts/upgradeProxy_box.js#L8) with the address created in Step 1. 
+5. We will be using `upgradeProxy` [script](https://github.com/prayagsingh/openzeppelin_upgrdabale_sc/blob/main/scripts/upgradeProxy_box.js) for this operation. But before deploying this script, please make sure to replace the address [here](https://github.com/prayagsingh/openzeppelin_upgrdabale_sc/blob/71287be9032d9f57b1ac9e6663e76adee90137c4/scripts/upgradeProxy_box.js#L8) with the contract address generated in Step 2. 
 
-5. Deploy the script using command `npx hardhat run --network polygon_test scripts/upgradeProxy_box.js`
+6. Deploy the script using command `npx hardhat run --network localhost scripts/upgradeProxy_box.js`
 
-6. Now we have successfully upgraded the smart-contract `Box` to `Boxv2` while ***keeping its state and the same address as before***.
+7. Now we have successfully upgraded the smart-contract `Box` to `Boxv2` while ***keeping its state and the same contract address as before***. Compare the output of Step 2 and Step 5. Both are using same contract address.
 
-7. Verify the upgradation using below commands.
-
-    A. `npx hardhat console --network polygon_test`
-    
-    B. `const BoxV2 = await ethers.getContractFactory('BoxV2');`
-    
-    C. `const box = await BoxV2.attach('< same address as in Step 2.C >');`
-    
-    D. `(await box.retrieve()).toString();` Result shoud be `42`.
-    
-    E. execute increment function using command `await box.increment();` 
-    
-    F. `(await box.retrieve()).toString();` Result should be `43`.
+8. Now lets test the `BoxV2` smart-contract by deploying the `execute_boxv2_func.js` script. But before deploying it, update the contract address [here](https://github.com/prayagsingh/openzeppelin_upgrdabale_sc/blob/71287be9032d9f57b1ac9e6663e76adee90137c4/scripts/execute_boxv2_func.js#L15). Now lets deploy the script using command `npx hardhat run scripts/execute_boxv2_func.js --network localhost`. It will return `35` as a value.
 
 **References:** 
 
diff --git a/contracts/Box.sol b/contracts/Box.sol
index c72f3e7..f1143a5 100644
--- a/contracts/Box.sol
+++ b/contracts/Box.sol
@@ -45,7 +45,8 @@ contract BoxV2 is Box {
     bool v2Initialized;
 
     // @note not possible to override the initialize function since it executes only once and not virtual in nature
-    // @note In upgradable smart contract we can't change anything in the Box contract. we can only add new functions and variables
+    // @note In upgradable smart contract we can't change anything in the Box contract. 
+    //       we can only add new functions and variables
     // @note https://forum.openzeppelin.com/t/understanding-upgradeable-smart-contract/15485
 
     function initializeV2() public returns (bool) {
diff --git a/env.example b/env.example
new file mode 100644
index 0000000..1936138
--- /dev/null
+++ b/env.example
@@ -0,0 +1,4 @@
+POLYGON_TEST_API_KEY=
+POLYGON_TEST_PRIVATE_KEY=
+METADATA_CID=
+REPORT_GAS=true
\ No newline at end of file
diff --git a/hardhat.config.js b/hardhat.config.js
index adabb6c..efb38ac 100644
--- a/hardhat.config.js
+++ b/hardhat.config.js
@@ -1,6 +1,9 @@
 require("@nomiclabs/hardhat-waffle");
 require('@nomiclabs/hardhat-ethers');
 require('@openzeppelin/hardhat-upgrades');
+require("hardhat-gas-reporter");
+require("solidity-coverage");
+require("@nomiclabs/hardhat-solhint");
 
 // for using .env file which contains private info. 
 require('dotenv').config();
@@ -29,6 +32,7 @@ module.exports = {
   defaultNetwork: "hardhat",
   networks: {
     hardhat: {
+      initialBaseFeePerGas: 0, // workaround from https://github.com/sc-forks/solidity-coverage/issues/652#issuecomment-896330136 . Remove when that issue is closed.
     },
     // rinkeby: {
     //   url: "https://eth-mainnet.alchemyapi.io/v2/123abc123abc123abc123abc123abcde",
@@ -58,6 +62,12 @@ module.exports = {
       timeout: 60000,
     }
   },
+  
+  gasReporter: {
+    enabled: process.env.REPORT_GAS !== undefined,
+    currency: "USD",
+  },
+
   solidity: {
     version: "0.8.4",
     settings: {
@@ -67,6 +77,7 @@ module.exports = {
       }
     }
   },
+
   paths: {
     sources: "./contracts",
     tests: "./test",
diff --git a/package-lock.json b/package-lock.json
index 3e66e0d..498b7e6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,18 +9,118 @@
       "license": "ISC",
       "dependencies": {
         "@openzeppelin/contracts": "^4.2.0",
-        "@openzeppelin/contracts-upgradeable": "^4.3.1",
+        "@openzeppelin/contracts-upgradeable": "^4.3.2",
         "dotenv": "^10.0.0"
       },
       "devDependencies": {
         "@nomiclabs/hardhat-ethers": "^2.0.2",
+        "@nomiclabs/hardhat-solhint": "^2.0.0",
         "@nomiclabs/hardhat-waffle": "^2.0.1",
         "@openzeppelin/hardhat-upgrades": "^1.9.0",
         "@openzeppelin/test-helpers": "^0.5.12",
         "chai": "^4.3.4",
         "ethereum-waffle": "^3.4.0",
         "ethers": "^5.4.4",
-        "hardhat": "^2.6.3"
+        "hardhat": "^2.6.3",
+        "hardhat-gas-reporter": "^1.0.4",
+        "solidity-coverage": "^0.7.17"
+      }
+    },
+    "node_modules/@babel/code-frame": {
+      "version": "7.14.5",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.14.5.tgz",
+      "integrity": "sha512-9pzDqyc6OLDaqe+zbACgFkb6fKMNG6CObKpnYXChRsvYGyEdc7CA2BaqeOM+vOtCS5ndmJicPJhKAwYRI6UfFw==",
+      "dev": true,
+      "dependencies": {
+        "@babel/highlight": "^7.14.5"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/helper-validator-identifier": {
+      "version": "7.14.9",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.14.9.tgz",
+      "integrity": "sha512-pQYxPY0UP6IHISRitNe8bsijHex4TWZXi2HwKVsjPiltzlhse2znVcm9Ace510VT1kxIHjGJCZZQBX2gJDbo0g==",
+      "dev": true,
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/highlight": {
+      "version": "7.14.5",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.14.5.tgz",
+      "integrity": "sha512-qf9u2WFWVV0MppaL877j2dBtQIDgmidgjGk5VIMw3OadXvYaXn66U1BFlH2t4+t3i+8PhedppRv+i40ABzd+gg==",
+      "dev": true,
+      "dependencies": {
+        "@babel/helper-validator-identifier": "^7.14.5",
+        "chalk": "^2.0.0",
+        "js-tokens": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/highlight/node_modules/ansi-styles": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+      "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+      "dev": true,
+      "dependencies": {
+        "color-convert": "^1.9.0"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/@babel/highlight/node_modules/chalk": {
+      "version": "2.4.2",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
+      "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
+      "dev": true,
+      "dependencies": {
+        "ansi-styles": "^3.2.1",
+        "escape-string-regexp": "^1.0.5",
+        "supports-color": "^5.3.0"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/@babel/highlight/node_modules/color-convert": {
+      "version": "1.9.3",
+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz",
+      "integrity": "sha512-QfAUtd+vFdAtFQcC8CCyYt1fYWxSqAiK2cSD6zDB8N3cpsEBAvRxp9zOGg6G/SHHJYAT88/az/IuDGALsNVbGg==",
+      "dev": true,
+      "dependencies": {
+        "color-name": "1.1.3"
+      }
+    },
+    "node_modules/@babel/highlight/node_modules/color-name": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
+      "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=",
+      "dev": true
+    },
+    "node_modules/@babel/highlight/node_modules/has-flag": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
+      "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0=",
+      "dev": true,
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/@babel/highlight/node_modules/supports-color": {
+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
+      "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
+      "dev": true,
+      "dependencies": {
+        "has-flag": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=4"
       }
     },
     "node_modules/@babel/runtime": {
@@ -35,6 +135,151 @@
         "node": ">=6.9.0"
       }
     },
+    "node_modules/@codechecks/client": {
+      "version": "0.1.11",
+      "resolved": "https://registry.npmjs.org/@codechecks/client/-/client-0.1.11.tgz",
+      "integrity": "sha512-dSIzHnGNcXxDZtnVQEXWQHXH2v9KrpnK4mDGDxdwSu3l00rOIVwJcttj0wzx0bC0Q6gs65VsQdZH4gkanLdXOA==",
+      "dev": true,
+      "peer": true,
+      "dependencies": {
+        "bluebird": "^3.5.3",
+        "chalk": "^2.4.2",
+        "commander": "^2.19.0",
+        "debug": "^4.1.1",
+        "execa": "^1.0.0",
+        "glob": "^7.1.3",
+        "graceful-fs": "^4.1.15",
+        "js-yaml": "^3.13.1",
+        "json5": "^2.1.0",
+        "lodash": "^4.17.11",
+        "marked": "^0.7.0",
+        "marked-terminal": "^3.3.0",
+        "mkdirp": "^0.5.1",
+        "ms": "^2.1.1",
+        "promise": "^8.0.2",
+        "request": "^2.88.0",
+        "request-promise": "^4.2.2",
+        "ts-essentials": "^1.0.2",
+        "ts-node": "^8.0.2",
+        "url-join": "^4.0.0"
+      },
+      "bin": {
+        "codechecks": "dist/runner.js"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/@codechecks/client/node_modules/ansi-styles": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+      "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+      "dev": true,
+      "peer": true,
+      "dependencies": {
+        "color-convert": "^1.9.0"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/@codechecks/client/node_modules/chalk": {
+      "version": "2.4.2",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
+      "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
+      "dev": true,
+      "peer": true,
+      "dependencies": {
+        "ansi-styles": "^3.2.1",
+        "escape-string-regexp": "^1.0.5",
+        "supports-color": "^5.3.0"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/@codechecks/client/node_modules/color-convert": {
+      "version": "1.9.3",
+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz",
+      "integrity": "sha512-QfAUtd+vFdAtFQcC8CCyYt1fYWxSqAiK2cSD6zDB8N3cpsEBAvRxp9zOGg6G/SHHJYAT88/az/IuDGALsNVbGg==",
+      "dev": true,
+      "peer": true,
+      "dependencies": {
+        "color-name": "1.1.3"
+      }
+    },
+    "node_modules/@codechecks/client/node_modules/color-name": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
+      "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=",
+      "dev": true,
+      "peer": true
+    },
+    "node_modules/@codechecks/client/node_modules/commander": {
+      "version": "2.20.3",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.3.tgz",
+      "integrity": "sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==",
+      "dev": true,
+      "peer": true
+    },
+    "node_modules/@codechecks/client/node_modules/execa": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/execa/-/execa-1.0.0.tgz",
+      "integrity": "sha512-adbxcyWV46qiHyvSp50TKt05tB4tK3HcmF7/nxfAdhnox83seTDbwnaqKO4sXRy7roHAIFqJP/Rw/AuEbX61LA==",
+      "dev": true,
+      "peer": true,
+      "dependencies": {
+        "cross-spawn": "^6.0.0",
+        "get-stream": "^4.0.0",
+        "is-stream": "^1.1.0",
+        "npm-run-path": "^2.0.0",
+        "p-finally": "^1.0.0",
+        "signal-exit": "^3.0.0",
+        "strip-eof": "^1.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/@codechecks/client/node_modules/has-flag": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
+      "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0=",
+      "dev": true,
+      "peer": true,
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/@codechecks/client/node_modules/json5": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/json5/-/json5-2.2.0.tgz",
+      "integrity": "sha512-f+8cldu7X/y7RAJurMEJmdoKXGB/X550w2Nr3tTbezL6RwEE/iMcm+tZnXeoZtKuOq6ft8+CqzEkrIgx1fPoQA==",
+      "dev": true,
+      "peer": true,
+      "dependencies": {
+        "minimist": "^1.2.5"
+      },
+      "bin": {
+        "json5": "lib/cli.js"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/@codechecks/client/node_modules/supports-color": {
+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
+      "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
+      "dev": true,
+      "peer": true,
+      "dependencies": {
+        "has-flag": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
     "node_modules/@ensdomains/address-encoder": {
       "version": "0.1.9",
       "resolved": "https://registry.npmjs.org/@ensdomains/address-encoder/-/address-encoder-0.1.9.tgz",
@@ -1059,6 +1304,41 @@
         "@ethersproject/strings": "^5.4.0"
       }
     },
+    "node_modules/@nodelib/fs.scandir": {
+      "version": "2.1.5",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz",
+      "integrity": "sha512-vq24Bq3ym5HEQm2NKCr3yXDwjc7vTsEThRDnkp2DK9p1uqLR+DHurm/NOTo0KG7HYHU7eppKZj3MyqYuMBf62g==",
+      "dev": true,
+      "dependencies": {
+        "@nodelib/fs.stat": "2.0.5",
+        "run-parallel": "^1.1.9"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    },
+    "node_modules/@nodelib/fs.stat": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.stat/-/fs.stat-2.0.5.tgz",
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       "version": "0.0.2",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.2.tgz",
@@ -42106,6 +47307,15 @@
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
       "dev": true
     },
+    "write": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/write/-/write-1.0.3.tgz",
+      "integrity": "sha512-/lg70HAjtkUgWPVZhZcm+T4hkL8Zbtp1nFNOn3lRrxnlv50SRBv7cR7RqR+GMsd3hUXy9hWBo4CHTbFTcOYwig==",
+      "dev": true,
+      "requires": {
+        "mkdirp": "^0.5.1"
+      }
+    },
     "ws": {
       "version": "7.4.6",
       "resolved": "https://registry.npmjs.org/ws/-/ws-7.4.6.tgz",
@@ -42296,6 +47506,13 @@
         "lodash": "^4.17.15",
         "yargs": "^13.3.0"
       }
+    },
+    "yn": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
+      "integrity": "sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==",
+      "dev": true,
+      "peer": true
     }
   }
 }
diff --git a/package.json b/package.json
index 222b982..51b4be4 100644
--- a/package.json
+++ b/package.json
@@ -11,17 +11,20 @@
   "license": "ISC",
   "devDependencies": {
     "@nomiclabs/hardhat-ethers": "^2.0.2",
+    "@nomiclabs/hardhat-solhint": "^2.0.0",
     "@nomiclabs/hardhat-waffle": "^2.0.1",
     "@openzeppelin/hardhat-upgrades": "^1.9.0",
     "@openzeppelin/test-helpers": "^0.5.12",
     "chai": "^4.3.4",
     "ethereum-waffle": "^3.4.0",
     "ethers": "^5.4.4",
-    "hardhat": "^2.6.3"
+    "hardhat": "^2.6.3",
+    "hardhat-gas-reporter": "^1.0.4",
+    "solidity-coverage": "^0.7.17"
   },
   "dependencies": {
     "@openzeppelin/contracts": "^4.2.0",
-    "@openzeppelin/contracts-upgradeable": "^4.3.1",
+    "@openzeppelin/contracts-upgradeable": "^4.3.2",
     "dotenv": "^10.0.0"
   }
 }