diff --git a/pkgs/contract/gas-report.txt b/pkgs/contract/gas-report.txt
index 9070de9..717a33b 100644
--- a/pkgs/contract/gas-report.txt
+++ b/pkgs/contract/gas-report.txt
@@ -9,6 +9,8 @@
 ··························|··············|·············|·············|···············|··············
 |  BigBang                ·           -  ·          -  ·    1248128  ·        4.2 %  ·          -  │
 ··························|··············|·············|·············|···············|··············
+|  BigBang_Mock_v2        ·           -  ·          -  ·    1326614  ·        4.4 %  ·          -  │
+··························|··············|·············|·············|···············|··············
 |  FractionToken          ·           -  ·          -  ·    2893315  ·        9.6 %  ·          -  │
 ··························|··············|·············|·············|···············|··············
 |  FractionToken_Mock_v2  ·           -  ·          -  ·    3037174  ·       10.1 %  ·          -  │
@@ -17,7 +19,7 @@
 ··························|··············|·············|·············|···············|··············
 |  HatsModule             ·           -  ·          -  ·     754132  ·        2.5 %  ·          -  │
 ··························|··············|·············|·············|···············|··············
-|  HatsModuleFactory      ·     1101110  ·    1101122  ·    1101118  ·        3.7 %  ·          -  │
+|  HatsModuleFactory      ·           -  ·          -  ·    1101122  ·        3.7 %  ·          -  │
 ··························|··············|·············|·············|···············|··············
 |  HatsTimeFrameModule    ·           -  ·          -  ·    1287099  ·        4.3 %  ·          -  │
 ··························|··············|·············|·············|···············|··············
diff --git a/pkgs/contract/helpers/upgrade.ts/bigbang.ts b/pkgs/contract/helpers/upgrade.ts/bigbang.ts
index 91c5758..a849d33 100644
--- a/pkgs/contract/helpers/upgrade.ts/bigbang.ts
+++ b/pkgs/contract/helpers/upgrade.ts/bigbang.ts
@@ -18,17 +18,10 @@ export const upgradeBigBang = async (
 	// アップグレードを実行
 	const _BigBang = (await upgrades.upgradeProxy(
 		contractAddress,
-		BigBang_Mock_v2,
-		params && {
-			call: {
-				fn: "initialize",
-				args: params,
-			},
-		}
+		BigBang_Mock_v2
 	)) as any;
 
-	await _BigBang.deployed();
-	const address = await _BigBang.getAddress();
+	const address = _BigBang.target;
 
 	console.log("upgraded address:", address);
 
diff --git a/pkgs/contract/helpers/upgrade.ts/fractionToken.ts b/pkgs/contract/helpers/upgrade.ts/fractionToken.ts
index e898fdd..6cbc92c 100644
--- a/pkgs/contract/helpers/upgrade.ts/fractionToken.ts
+++ b/pkgs/contract/helpers/upgrade.ts/fractionToken.ts
@@ -24,6 +24,8 @@ export const upgradeFractionToken = async (
 
 	const address = _FractionToken.target;
 
+	console.log("upgraded address:", address);
+
 	// create a new instance of the contract
 	const newFractionToken = await viem.getContractAt(
 		contractName,
diff --git a/pkgs/contract/test/BigBang.ts b/pkgs/contract/test/BigBang.ts
index 1c87685..16ac216 100644
--- a/pkgs/contract/test/BigBang.ts
+++ b/pkgs/contract/test/BigBang.ts
@@ -24,6 +24,7 @@ import {
 	SplitsCreatorFactory,
 	SplitsWarehouse,
 } from "../helpers/deploy/Splits";
+import { upgradeBigBang } from "../helpers/upgrade.ts/bigbang";
 
 describe("BigBang", () => {
 	let Hats: Hats;
@@ -131,4 +132,63 @@ describe("BigBang", () => {
 			} catch (error) {}
 		}
 	});
+
+	/**
+	 * 以降は、Upgradeのテストコードになる。
+	 * Upgrade後に再度機能をテストする。
+	 */
+	describe("Upgrade Test", () => {
+		it("upgrde", async () => {
+			// BigBangをアップグレード
+			const newBigBang = await upgradeBigBang(
+				BigBang.address,
+				"BigBang_Mock_v2",
+				["", 10000n, Hats.address, zeroAddress]
+			);
+
+			// upgrade後にしかないメソッドを実行
+			const result = await newBigBang.read.testUpgradeFunction();
+			expect(result).to.equal("testUpgradeFunction");
+		});
+
+		it("should execute bigbang after upgrade", async () => {
+			// BigBangをアップグレード
+			const newBigBang = await upgradeBigBang(
+				BigBang.address,
+				"BigBang_Mock_v2",
+				["", 10000n, Hats.address, zeroAddress]
+			);
+
+			const txHash = await newBigBang.write.bigbang(
+				[
+					address1.account?.address!,
+					"tophatDetails",
+					"tophatURI",
+					"hatterhatDetails",
+					"hatterhatURI",
+					address1.account?.address!,
+				],
+				{ account: address1.account }
+			);
+
+			const receipt = await publicClient.waitForTransactionReceipt({
+				hash: txHash,
+			});
+
+			for (const log of receipt.logs) {
+				try {
+					const decodedLog: any = decodeEventLog({
+						abi: newBigBang.abi as any,
+						data: log.data,
+						topics: log.topics,
+					});
+					if (decodedLog.eventName == "Executed") {
+						expect(decodedLog.args.owner.toLowerCase()).to.be.equal(
+							address1.account?.address!
+						);
+					}
+				} catch (error) {}
+			}
+		});
+	});
 });