diff --git a/contracts/Git3Hub.sol b/contracts/Git3Hub.sol
index 2107900..0bae895 100644
--- a/contracts/Git3Hub.sol
+++ b/contracts/Git3Hub.sol
@@ -5,7 +5,7 @@ pragma solidity ^0.8.0;
 // import "@openzeppelin/contracts/access/Ownable.sol";
 import "./v2/LargeStorageManagerV2.sol";
 
-contract Git3Hub is LargeStorageManagerV2 {
+contract Git3HubStorage {
     struct refInfo {
         bytes20 hash;
         uint96 index;
@@ -16,23 +16,17 @@ contract Git3Hub is LargeStorageManagerV2 {
         bytes name;
     }
 
-    event RepoCreated(bytes repoName, address owner);
-    event RepoOwnerTransfer(bytes repoName, address oldOwner, address newOwner);
-    event PushRef(bytes repoName, bytes ref);
-
     mapping(bytes => address) public repoNameToOwner;
     mapping(bytes => refInfo) public nameToRefInfo; // dev => {hash: 0x1234..., index: 1 }
     mapping(bytes => bytes[]) public repoNameToRefs; // [main, dev, test, staging]
+}
 
-    function _convertRefInfo(
-        bytes memory repoName,
-        refInfo memory info
-    ) internal view returns (refData memory res) {
-        res.hash = info.hash;
-        res.name = repoNameToRefs[repoName][info.index];
-    }
+contract Git3Hub is Git3HubStorage, LargeStorageManagerV2 {
+    event RepoCreated(bytes repoName, address owner);
+    event RepoOwnerTransfer(bytes repoName, address oldOwner, address newOwner);
+    event PushRef(bytes repoName, bytes ref);
 
-    constructor() LargeStorageManagerV2(0) {}
+    constructor() LargeStorageManagerV2() {}
 
     modifier onlyOwner(bytes memory repoName) {
         require(repoNameToOwner[repoName] == msg.sender, "only owner");
@@ -231,4 +225,12 @@ contract Git3Hub is LargeStorageManagerV2 {
         repoNameToRefs[repoName].pop();
         delete nameToRefInfo[fullName];
     }
+
+    function _convertRefInfo(
+        bytes memory repoName,
+        refInfo memory info
+    ) internal view returns (refData memory res) {
+        res.hash = info.hash;
+        res.name = repoNameToRefs[repoName][info.index];
+    }
 }
diff --git a/contracts/v2/LargeStorageManagerV2.sol b/contracts/v2/LargeStorageManagerV2.sol
index c912c7b..d866557 100644
--- a/contracts/v2/LargeStorageManagerV2.sol
+++ b/contracts/v2/LargeStorageManagerV2.sol
@@ -10,16 +10,12 @@ contract LargeStorageManagerV2 {
     using SlotHelper for bytes32;
     using SlotHelper for address;
 
-    uint8 internal immutable SLOT_LIMIT;
+    uint8 internal constant SLOT_LIMIT = 0;
 
     mapping(bytes32 => mapping(uint256 => bytes32)) internal keyToMetadata;
     mapping(bytes32 => mapping(uint256 => mapping(uint256 => bytes32)))
         internal keyToSlots;
 
-    constructor(uint8 slotLimit) {
-        SLOT_LIMIT = slotLimit;
-    }
-
     function isOptimize() public view returns (bool) {
         return SLOT_LIMIT > 0;
     }
diff --git a/contracts/v2/LargerStorageManagerV2Test.sol b/contracts/v2/LargerStorageManagerV2Test.sol
index b8d3d69..398de6b 100644
--- a/contracts/v2/LargerStorageManagerV2Test.sol
+++ b/contracts/v2/LargerStorageManagerV2Test.sol
@@ -4,8 +4,6 @@ pragma solidity ^0.8.0;
 import "./LargeStorageManagerV2.sol";
 
 contract LargeStorageManagerV2Test is LargeStorageManagerV2 {
-    constructor(uint8 slotLimit) LargeStorageManagerV2(slotLimit) {}
-
     function get(bytes32 key) public view returns (bytes memory, bool) {
         (bytes memory data, bool found) = _get(key);
         return (data, found);
diff --git a/hardhat.config.ts b/hardhat.config.ts
index 0b88ed5..e9d761f 100644
--- a/hardhat.config.ts
+++ b/hardhat.config.ts
@@ -2,6 +2,8 @@ require("dotenv").config();
 
 import { HardhatUserConfig } from "hardhat/config";
 import "@nomicfoundation/hardhat-toolbox";
+import "@nomiclabs/hardhat-web3";
+import "@nomiclabs/hardhat-ethers";
 import { NetworkDefinition, EtherscanConfig } from "./local.config";
 
 const config: HardhatUserConfig = {
diff --git a/package-lock.json b/package-lock.json
index 96647ba..749e18c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,7 +5,6 @@
   "requires": true,
   "packages": {
     "": {
-      "name": "git3-contract",
       "version": "1.0.0",
       "license": "ISC",
       "dependencies": {
@@ -13,11 +12,13 @@
         "@nomiclabs/hardhat-ethers": "^2.2.2",
         "@nomiclabs/hardhat-etherscan": "^3.1.5",
         "@openzeppelin/contracts": "^4.8.1",
+        "@openzeppelin/contracts-upgradeable": "^4.8.1",
         "chai": "^4.3.7",
         "typechain": "^8.1.1"
       },
       "devDependencies": {
         "@nomicfoundation/hardhat-toolbox": "^2.0.1",
+        "@nomiclabs/hardhat-web3": "^2.0.0",
         "@typechain/ethers-v5": "^10.2.0",
         "@typechain/hardhat": "^6.1.5",
         "dotenv": "^16.0.3",
@@ -43,6 +44,110 @@
         "node": ">=12"
       }
     },
+    "node_modules/@ethereumjs/common": {
+      "version": "2.5.0",
+      "resolved": "https://registry.npmjs.org/@ethereumjs/common/-/common-2.5.0.tgz",
+      "integrity": "sha512-DEHjW6e38o+JmB/NO3GZBpW4lpaiBpkFgXF6jLcJ6gETBYpEyaA5nTimsWBUJR3Vmtm/didUEbNjajskugZORg==",
+      "dev": true,
+      "peer": true,
+      "dependencies": {
+        "crc-32": "^1.2.0",
+        "ethereumjs-util": "^7.1.1"
+      }
+    },
+    "node_modules/@ethereumjs/common/node_modules/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,
+      "peer": true,
+      "dependencies": {
+        "@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"
+      }
+    },
+    "node_modules/@ethereumjs/common/node_modules/ethereumjs-util": {
+      "version": "7.1.5",
+      "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-7.1.5.tgz",
+      "integrity": "sha512-SDl5kKrQAudFBUe5OJM9Ac6WmMyYmXX/6sTmLZ3ffG2eY6ZIGBes3pEDxNN6V72WyOw4CPD5RomKdsa8DAAwLg==",
+      "dev": true,
+      "peer": true,
+      "dependencies": {
+        "@types/bn.js": "^5.1.0",
+        "bn.js": "^5.1.2",
+        "create-hash": "^1.1.2",
+        "ethereum-cryptography": "^0.1.3",
+        "rlp": "^2.2.4"
+      },
+      "engines": {
+        "node": ">=10.0.0"
+      }
+    },
+    "node_modules/@ethereumjs/tx": {
+      "version": "3.3.2",
+      "resolved": "https://registry.npmjs.org/@ethereumjs/tx/-/tx-3.3.2.tgz",
+      "integrity": "sha512-6AaJhwg4ucmwTvw/1qLaZUX5miWrwZ4nLOUsKyb/HtzS3BMw/CasKhdi1ims9mBKeK9sOJCH4qGKOBGyJCeeog==",
+      "dev": true,
+      "peer": true,
+      "dependencies": {
+        "@ethereumjs/common": "^2.5.0",
+        "ethereumjs-util": "^7.1.2"
+      }
+    },
+    "node_modules/@ethereumjs/tx/node_modules/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,
+      "peer": true,
+      "dependencies": {
+        "@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"
+      }
+    },
+    "node_modules/@ethereumjs/tx/node_modules/ethereumjs-util": {
+      "version": "7.1.5",
+      "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-7.1.5.tgz",
+      "integrity": "sha512-SDl5kKrQAudFBUe5OJM9Ac6WmMyYmXX/6sTmLZ3ffG2eY6ZIGBes3pEDxNN6V72WyOw4CPD5RomKdsa8DAAwLg==",
+      "dev": true,
+      "peer": true,
+      "dependencies": {
+        "@types/bn.js": "^5.1.0",
+        "bn.js": "^5.1.2",
+        "create-hash": "^1.1.2",
+        "ethereum-cryptography": "^0.1.3",
+        "rlp": "^2.2.4"
+      },
+      "engines": {
+        "node": ">=10.0.0"
+      }
+    },
     "node_modules/@ethersproject/abi": {
       "version": "5.7.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/abi/-/abi-5.7.0.tgz",
@@ -1393,11 +1498,29 @@
         "hardhat": "^2.0.4"
       }
     },
+    "node_modules/@nomiclabs/hardhat-web3": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/@nomiclabs/hardhat-web3/-/hardhat-web3-2.0.0.tgz",
+      "integrity": "sha512-zt4xN+D+fKl3wW2YlTX3k9APR3XZgPkxJYf36AcliJn3oujnKEVRZaHu0PhgLjO+gR+F/kiYayo9fgd2L8970Q==",
+      "dev": true,
+      "dependencies": {
+        "@types/bignumber.js": "^5.0.0"
+      },
+      "peerDependencies": {
+        "hardhat": "^2.0.0",
+        "web3": "^1.0.0-beta.36"
+      }
+    },
     "node_modules/@openzeppelin/contracts": {
       "version": "4.8.1",
       "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-4.8.1.tgz",
       "integrity": "sha512-xQ6eUZl+RDyb/FiZe1h+U7qr/f4p/SrTSQcTPH2bjur3C5DbuW/zFgCU/b1P/xcIaEqJep+9ju4xDRi3rmChdQ=="
     },
+    "node_modules/@openzeppelin/contracts-upgradeable": {
+      "version": "4.8.1",
+      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts-upgradeable/-/contracts-upgradeable-4.8.1.tgz",
+      "integrity": "sha512-1wTv+20lNiC0R07jyIAbHU7TNHKRwGiTGRfiNnA8jOWjKT98g5OgLpYWOi40Vgpk8SPLA9EvfJAbAeIyVn+7Bw=="
+    },
     "node_modules/@scure/base": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/@scure/base/-/base-1.1.1.tgz",
@@ -1535,6 +1658,19 @@
         "node": ">=6"
       }
     },
+    "node_modules/@sindresorhus/is": {
+      "version": "4.6.0",
+      "resolved": "https://registry.npmjs.org/@sindresorhus/is/-/is-4.6.0.tgz",
+      "integrity": "sha512-t09vSN3MdfsyCHoFcTRCH/iUtG7OJ0CsjzB8cjAmKc/va/kIgeDI/TxsigdncE/4be734m0cvIYwNaV4i2XqAw==",
+      "dev": true,
+      "peer": true,
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sindresorhus/is?sponsor=1"
+      }
+    },
     "node_modules/@solidity-parser/parser": {
       "version": "0.14.5",
       "resolved": "https://registry.npmjs.org/@solidity-parser/parser/-/parser-0.14.5.tgz",
@@ -1544,6 +1680,19 @@
         "antlr4ts": "^0.5.0-alpha.4"
       }
     },
+    "node_modules/@szmarczak/http-timer": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/@szmarczak/http-timer/-/http-timer-5.0.1.tgz",
+      "integrity": "sha512-+PmQX0PiAYPMeVYe237LJAYvOMYW1j2rH5YROyS3b4CTVJum34HfRvKvAzozHAQG0TnHNdUfY9nCeUyRAs//cw==",
+      "dev": true,
+      "peer": true,
+      "dependencies": {
+        "defer-to-connect": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=14.16"
+      }
+    },
     "node_modules/@tsconfig/node10": {
       "version": "1.0.9",
       "resolved": "https://registry.npmjs.org/@tsconfig/node10/-/node10-1.0.9.tgz",
@@ -1644,6 +1793,16 @@
       "resolved": "https://registry.npmjs.org/@types/async-eventemitter/-/async-eventemitter-0.2.1.tgz",
       "integrity": "sha512-M2P4Ng26QbAeITiH7w1d7OxtldgfAe0wobpyJzVK/XOb0cUGKU2R4pfAhqcJBXAe2ife5ZOhSv4wk7p+ffURtg=="
     },
+    "node_modules/@types/bignumber.js": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/@types/bignumber.js/-/bignumber.js-5.0.0.tgz",
+      "integrity": "sha512-0DH7aPGCClywOFaxxjE6UwpN2kQYe9LwuDQMv+zYA97j5GkOMo8e66LYT+a8JYU7jfmUFRZLa9KycxHDsKXJCA==",
+      "deprecated": "This is a stub types definition for bignumber.js (https://github.com/MikeMcl/bignumber.js/). bignumber.js provides its own type definitions, so you don't need @types/bignumber.js installed!",
+      "dev": true,
+      "dependencies": {
+        "bignumber.js": "*"
+      }
+    },
     "node_modules/@types/bn.js": {
       "version": "5.1.1",
       "resolved": "https://registry.npmjs.org/@types/bn.js/-/bn.js-5.1.1.tgz",
@@ -1652,6 +1811,19 @@
         "@types/node": "*"
       }
     },
+    "node_modules/@types/cacheable-request": {
+      "version": "6.0.3",
+      "resolved": "https://registry.npmjs.org/@types/cacheable-request/-/cacheable-request-6.0.3.tgz",
+      "integrity": "sha512-IQ3EbTzGxIigb1I3qPZc1rWJnH0BmSKv5QYTalEwweFvyBDLSAe24zP0le/hyi7ecGfZVlIVAg4BZqb8WBwKqw==",
+      "dev": true,
+      "peer": true,
+      "dependencies": {
+        "@types/http-cache-semantics": "*",
+        "@types/keyv": "^3.1.4",
+        "@types/node": "*",
+        "@types/responselike": "^1.0.0"
+      }
+    },
     "node_modules/@types/chai": {
       "version": "4.3.4",
       "resolved": "https://registry.npmjs.org/@types/chai/-/chai-4.3.4.tgz",
@@ -1693,6 +1865,23 @@
         "@types/node": "*"
       }
     },
+    "node_modules/@types/http-cache-semantics": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/@types/http-cache-semantics/-/http-cache-semantics-4.0.1.tgz",
+      "integrity": "sha512-SZs7ekbP8CN0txVG2xVRH6EgKmEm31BOxA07vkFaETzZz1xh+cbt8BcI0slpymvwhx5dlFnQG2rTlPVQn+iRPQ==",
+      "dev": true,
+      "peer": true
+    },
+    "node_modules/@types/keyv": {
+      "version": "3.1.4",
+      "resolved": "https://registry.npmjs.org/@types/keyv/-/keyv-3.1.4.tgz",
+      "integrity": "sha512-BQ5aZNSCpj7D6K2ksrRCTmKRLEpnPvWDiLPfoGyhZ++8YtiK9d/3DBKPJgry359X/P1PfruyYwvnvwFjuEiEIg==",
+      "dev": true,
+      "peer": true,
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/@types/lru-cache": {
       "version": "5.1.1",
       "resolved": "https://registry.npmjs.org/@types/lru-cache/-/lru-cache-5.1.1.tgz",
@@ -1735,6 +1924,16 @@
       "integrity": "sha512-FGa1F62FT09qcrueBA6qYTrJPVDzah9a+493+o2PCXsesWHIn27G98TsSMs3WPNbZIEj4+VJf6saSFpvD+3Zsw==",
       "dev": true
     },
+    "node_modules/@types/responselike": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@types/responselike/-/responselike-1.0.0.tgz",
+      "integrity": "sha512-85Y2BjiufFzaMIlvJDvTTB8Fxl2xfLo4HgmHzVBz08w4wDePCTjYw66PdrolO0kzli3yam/YCgRufyo1DdQVTA==",
+      "dev": true,
+      "peer": true,
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/@types/secp256k1": {
       "version": "4.0.3",
       "resolved": "https://registry.npmjs.org/@types/secp256k1/-/secp256k1-4.0.3.tgz",
@@ -1760,6 +1959,13 @@
         "node": ">=6.5"
       }
     },
+    "node_modules/abortcontroller-polyfill": {
+      "version": "1.7.5",
+      "resolved": "https://registry.npmjs.org/abortcontroller-polyfill/-/abortcontroller-polyfill-1.7.5.tgz",
+      "integrity": "sha512-JMJ5soJWP18htbbxJjG7bG6yuI6pRhgJ0scHHTfkUjf6wjP912xZWvM+A4sJK3gqd9E8fcPbDnOefbA9Th/FIQ==",
+      "dev": true,
+      "peer": true
+    },
     "node_modules/abstract-level": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/abstract-level/-/abstract-level-1.0.3.tgz",
@@ -1777,6 +1983,20 @@
         "node": ">=12"
       }
     },
+    "node_modules/accepts": {
+      "version": "1.3.8",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz",
+      "integrity": "sha512-PYAthTa2m2VKxuvSD3DPC/Gy+U+sOA1LAuT8mkmRuvw+NACSaeXEQ+NHcVF7rONl6qcaxV3Uuemwawk+7+SJLw==",
+      "dev": true,
+      "peer": true,
+      "dependencies": {
+        "mime-types": "~2.1.34",
+        "negotiator": "0.6.3"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
     "node_modules/acorn": {
       "version": "8.8.1",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.8.1.tgz",
@@ -1947,6 +2167,13 @@
         "node": ">=6"
       }
     },
+    "node_modules/array-flatten": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
+      "integrity": "sha512-PCVAQswWemu6UdxsDFFX/+gVeYqKAod3D3UVm91jHwynguOwAvYPhx8nNlM++NqRcK6CxxpUafjmhIdKiHibqg==",
+      "dev": true,
+      "peer": true
+    },
     "node_modules/array-union": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/array-union/-/array-union-2.1.0.tgz",
@@ -1999,6 +2226,26 @@
         "safer-buffer": "~2.1.0"
       }
     },
+    "node_modules/asn1.js": {
+      "version": "5.4.1",
+      "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-5.4.1.tgz",
+      "integrity": "sha512-+I//4cYPccV8LdmBLiX8CYvf9Sp3vQsrqu2QNXRcrbiWvcx/UdlFiqUJJzxRQxgsZmvhXhn4cSKeSmoFjVdupA==",
+      "dev": true,
+      "peer": true,
+      "dependencies": {
+        "bn.js": "^4.0.0",
+        "inherits": "^2.0.1",
+        "minimalistic-assert": "^1.0.0",
+        "safer-buffer": "^2.1.0"
+      }
+    },
+    "node_modules/asn1.js/node_modules/bn.js": {
+      "version": "4.12.0",
+      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.12.0.tgz",
+      "integrity": "sha512-c98Bf3tPniI+scsdk237ku1Dc3ujXQTSgyiPUDEOe7tRkhrqridvh8klBv0HCEso1OLOYcHuCv/cS6DNxKH+ZA==",
+      "dev": true,
+      "peer": true
+    },
     "node_modules/assert-plus": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
@@ -2040,6 +2287,13 @@
         "async": "^2.4.0"
       }
     },
+    "node_modules/async-limiter": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.1.tgz",
+      "integrity": "sha512-csOlWGAcRFJaI6m+F2WKdnMKr4HhdhFVBk0H/QbJFMCr+uO2kwohwXQPxw/9OCxp05r5ghVBFSyioixx3gfkNQ==",
+      "dev": true,
+      "peer": true
+    },
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+      "resolved": "https://registry.npmjs.org/which-typed-array/-/which-typed-array-1.1.9.tgz",
+      "integrity": "sha512-w9c4xkx6mPidwp7180ckYWfMmvxpjlZuIudNtDf4N/tTAUB8VJbX25qZoAsrtGuYNnGw3pa0AXgbGKRB8/EceA==",
+      "dev": true,
+      "peer": true,
+      "requires": {
+        "available-typed-arrays": "^1.0.5",
+        "call-bind": "^1.0.2",
+        "for-each": "^0.3.3",
+        "gopd": "^1.0.1",
+        "has-tostringtag": "^1.0.0",
+        "is-typed-array": "^1.1.10"
+      }
+    },
     "wide-align": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
@@ -14693,17 +19733,70 @@
       "integrity": "sha512-F+P9Jil7UiSKSkppIiD94dN07AwvFixvLIj1Og1Rl9GGMuNipJnV9JzjD6XuqmAeiswGvUmNLjr5cFuXwNS77Q==",
       "requires": {}
     },
+    "xhr": {
+      "version": "2.6.0",
+      "resolved": "https://registry.npmjs.org/xhr/-/xhr-2.6.0.tgz",
+      "integrity": "sha512-/eCGLb5rxjx5e3mF1A7s+pLlR6CGyqWN91fv1JgER5mVWg1MZmlhBvy9kjcsOdRk8RrIujotWyJamfyrp+WIcA==",
+      "dev": true,
+      "peer": true,
+      "requires": {
+        "global": "~4.4.0",
+        "is-function": "^1.0.1",
+        "parse-headers": "^2.0.0",
+        "xtend": "^4.0.0"
+      }
+    },
+    "xhr-request": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/xhr-request/-/xhr-request-1.1.0.tgz",
+      "integrity": "sha512-Y7qzEaR3FDtL3fP30k9wO/e+FBnBByZeybKOhASsGP30NIkRAAkKD/sCnLvgEfAIEC1rcmK7YG8f4oEnIrrWzA==",
+      "dev": true,
+      "peer": true,
+      "requires": {
+        "buffer-to-arraybuffer": "^0.0.5",
+        "object-assign": "^4.1.1",
+        "query-string": "^5.0.1",
+        "simple-get": "^2.7.0",
+        "timed-out": "^4.0.1",
+        "url-set-query": "^1.0.0",
+        "xhr": "^2.0.4"
+      }
+    },
+    "xhr-request-promise": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/xhr-request-promise/-/xhr-request-promise-0.1.3.tgz",
+      "integrity": "sha512-YUBytBsuwgitWtdRzXDDkWAXzhdGB8bYm0sSzMPZT7Z2MBjMSTHFsyCT1yCRATY+XC69DUrQraRAEgcoCRaIPg==",
+      "dev": true,
+      "peer": true,
+      "requires": {
+        "xhr-request": "^1.1.0"
+      }
+    },
     "xmlhttprequest": {
       "version": "1.8.0",
       "resolved": "https://registry.npmjs.org/xmlhttprequest/-/xmlhttprequest-1.8.0.tgz",
       "integrity": "sha512-58Im/U0mlVBLM38NdZjHyhuMtCqa61469k2YP/AaPbvCoV9aQGUpbJBj1QRm2ytRiVQBD/fsw7L2bJGDVQswBA==",
       "dev": true
     },
+    "xtend": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
+      "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==",
+      "dev": true,
+      "peer": true
+    },
     "y18n": {
       "version": "5.0.8",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
       "integrity": "sha512-0pfFzegeDWJHJIAmTLRP2DwHjdF5s7jo9tuztdQxAhINCdvS+3nGINqPd00AphqJR/0LhANUS6/+7SCb98YOfA=="
     },
+    "yaeti": {
+      "version": "0.0.6",
+      "resolved": "https://registry.npmjs.org/yaeti/-/yaeti-0.0.6.tgz",
+      "integrity": "sha512-MvQa//+KcZCUkBTIC9blM+CU9J2GzuTytsOUwf2lidtvkx/6gnEp1QvJv34t9vdjhFmha/mUiNDbN0D0mJWdug==",
+      "dev": true,
+      "peer": true
+    },
     "yallist": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
diff --git a/package.json b/package.json
index 8482788..5a4c25b 100644
--- a/package.json
+++ b/package.json
@@ -18,6 +18,7 @@
   "homepage": "https://github.com/git3protocol/git3-contract#readme",
   "devDependencies": {
     "@nomicfoundation/hardhat-toolbox": "^2.0.1",
+    "@nomiclabs/hardhat-web3": "^2.0.0",
     "@typechain/ethers-v5": "^10.2.0",
     "@typechain/hardhat": "^6.1.5",
     "dotenv": "^16.0.3",
@@ -35,7 +36,8 @@
     "@nomiclabs/hardhat-ethers": "^2.2.2",
     "@nomiclabs/hardhat-etherscan": "^3.1.5",
     "@openzeppelin/contracts": "^4.8.1",
+    "@openzeppelin/contracts-upgradeable": "^4.8.1",
     "chai": "^4.3.7",
     "typechain": "^8.1.1"
   }
-}
\ No newline at end of file
+}
diff --git a/test/git3-test.js b/test/git3-test.js
index 51eba49..7a92a4b 100644
--- a/test/git3-test.js
+++ b/test/git3-test.js
@@ -8,6 +8,79 @@ var ToBig = (x) => ethers.BigNumber.from(x);
 let ETH = ethers.BigNumber.from(10).pow(18);
 
 describe("Git3 Test", function () {
+  it("Check Upgradeable", async function () {
+    let repoName = Buffer.from("test");
+    let [operator, acc1, acc2] = await ethers.getSigners();
+    const Git3 = await ethers.getContractFactory("Git3Hub");
+    const git3 = await Git3.deploy();
+    await git3.deployed();
+
+    let git3Upgraded = await Git3.connect(acc2).deploy();
+    await git3Upgraded.deployed();
+
+    let factory1 = await ethers.getContractFactory("UpgradeableProxy");
+    // Proxy don't need to init Git3 contract because the constructor is empty.
+    let initSelector = "0x";
+    let proxyInstance = await factory1
+      .connect(operator)
+      .deploy(git3.address, acc1.address, initSelector);
+    await proxyInstance.deployed();
+
+    let git3Proxy = await ethers.getContractAt(
+      "Git3Hub",
+      proxyInstance.address
+    );
+    await git3Proxy.createRepo(repoName);
+    await git3Proxy.upload(repoName, "0x616263", "0x112233");
+    expect(await git3Proxy.download(repoName, "0x616263")).to.eql([
+      "0x112233",
+      true,
+    ]);
+
+    const adminSlot =
+      "0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103";
+    let actualAdmin = await web3.eth.getStorageAt(
+      proxyInstance.address,
+      adminSlot
+    );
+    let actualA = web3.utils.toBN(actualAdmin).toString();
+    let expectA = web3.utils.toBN(acc1.address).toString();
+    expect(actualA).to.equal(expectA);
+
+    await proxyInstance.connect(acc1).changeAdmin(acc2.address);
+    actualAdmin = await web3.eth.getStorageAt(proxyInstance.address, adminSlot);
+    actualA = web3.utils.toBN(actualAdmin).toString();
+    expectA = web3.utils.toBN(acc2.address).toString();
+    expect(actualA).to.equal(expectA);
+
+    const ImplementationSlot =
+      "0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc";
+    let actualImplement = await web3.eth.getStorageAt(
+      proxyInstance.address,
+      ImplementationSlot
+    );
+    let actualI = web3.utils.toBN(actualImplement).toString();
+    let expectI = web3.utils.toBN(git3.address).toString();
+    expect(actualI).to.equal(expectI);
+
+    //****upgrade contract***//
+    // await expect(proxyInstance.connect(acc2).upgradeToAndCall(git3Upgraded.address,initSelector)).to.be.revertedWith("Initializable: contract is already initialized")
+    await proxyInstance.connect(acc2).upgradeTo(git3Upgraded.address);
+
+    actualImplement = await web3.eth.getStorageAt(
+      proxyInstance.address,
+      ImplementationSlot
+    );
+    actualI = web3.utils.toBN(actualImplement).toString();
+    expectI = web3.utils.toBN(git3Upgraded.address).toString();
+    expect(actualI).to.equal(expectI);
+
+    expect(await git3Proxy.download(repoName, "0x616263")).to.eql([
+      "0x112233",
+      true,
+    ]);
+  });
+
   it("upload/download/remove", async function () {
     const Git3 = await ethers.getContractFactory("Git3Hub");
     const git3 = await Git3.deploy();
diff --git a/test/large-storage-helper-v2-test.js b/test/large-storage-helper-v2-test.js
index a2afce4..b1b812c 100644
--- a/test/large-storage-helper-v2-test.js
+++ b/test/large-storage-helper-v2-test.js
@@ -10,7 +10,7 @@ let ETH = ethers.BigNumber.from("10").pow("18");
 describe("FlatDirectory Test", function () {
   it("read/write", async function () {
     const FlatDirectory = await ethers.getContractFactory(contractName);
-    const fd = await FlatDirectory.deploy(0);
+    const fd = await FlatDirectory.deploy();
     await fd.deployed();
 
     await fd.putChunk(key, 0, "0x112233");
@@ -26,7 +26,7 @@ describe("FlatDirectory Test", function () {
 
   it("read/write chunks", async function () {
     const FlatDirectory = await ethers.getContractFactory(contractName);
-    const fd = await FlatDirectory.deploy(0);
+    const fd = await FlatDirectory.deploy();
     await fd.deployed();
 
     let data0 = Array.from({ length: 1024 }, () =>
@@ -51,7 +51,7 @@ describe("FlatDirectory Test", function () {
 
   it("write/remove chunks", async function () {
     const FlatDirectory = await ethers.getContractFactory(contractName);
-    const fd = await FlatDirectory.deploy(0);
+    const fd = await FlatDirectory.deploy();
     await fd.deployed();
 
     expect(await fd.countChunks(key)).to.eql(ToBig(0));
@@ -88,7 +88,7 @@ describe("FlatDirectory Test", function () {
 
   it("remove chunks and refund to user", async function () {
     const FlatDirectory = await ethers.getContractFactory(contractName);
-    const fd = await FlatDirectory.deploy(0);
+    const fd = await FlatDirectory.deploy();
     await fd.deployed();
 
     let stakeTokenNum = ETH;
diff --git a/test/upgrade-test.js b/test/upgrade-test.js
new file mode 100644
index 0000000..e69de29