diff --git a/.github/workflows/swift.yml b/.github/workflows/swift.yml
index 92a797f..ac670ec 100644
--- a/.github/workflows/swift.yml
+++ b/.github/workflows/swift.yml
@@ -13,6 +13,8 @@ jobs:
     runs-on: macos-14
     steps:
     - uses: actions/checkout@v4
+    - name: Change Xcode version
+      run: sudo xcode-select -s /Applications/Xcode_16.2.app
     - name: Install swiftlint
       run: |
         brew update
diff --git a/Package.swift b/Package.swift
index 760fe3a..b110d64 100644
--- a/Package.swift
+++ b/Package.swift
@@ -17,7 +17,7 @@ let package = Package(
     ],
     dependencies: [
         .package(url: "https://github.com/fumito-ito/FunctionCalling", from: "0.5.0"),
-        .package(url: "https://github.com/firebase/firebase-ios-sdk.git", from: "11.11.0")
+        .package(url: "https://github.com/firebase/firebase-ios-sdk.git", from: "11.13.0")
     ],
     targets: [
         // Targets are the basic building blocks of a package, defining a module or a test suite.
diff --git a/Tests/FunctionCalling-FirebaseVertexAITests/Extensions.swift b/Tests/FunctionCalling-FirebaseVertexAITests/Extensions.swift
deleted file mode 100644
index 8efe9a5..0000000
--- a/Tests/FunctionCalling-FirebaseVertexAITests/Extensions.swift
+++ /dev/null
@@ -1,24 +0,0 @@
-//
-//  Extensions.swift
-//  FunctionCalling-FirebaseVertexAI
-//
-//  Created by 伊藤史 on 2024/09/20.
-//
-
-@testable import FirebaseVertexAI
-
-extension FirebaseVertexAI.Tool {
-    var functions: [FirebaseVertexAI.FunctionDeclaration]? {
-        functionDeclarations
-    }
-}
-
-extension FirebaseVertexAI.FunctionDeclaration {
-    func getName() -> String {
-        name
-    }
-
-    func getDescription() -> String {
-        description
-    }
-}
diff --git a/Tests/FunctionCalling-FirebaseVertexAITests/FunctionCalling_FirebaseVertexAITests.swift b/Tests/FunctionCalling-FirebaseVertexAITests/FunctionCalling_FirebaseVertexAITests.swift
index 05fd7e4..0d60b14 100644
--- a/Tests/FunctionCalling-FirebaseVertexAITests/FunctionCalling_FirebaseVertexAITests.swift
+++ b/Tests/FunctionCalling-FirebaseVertexAITests/FunctionCalling_FirebaseVertexAITests.swift
@@ -21,20 +21,31 @@ final class FunctionCalling_FirebaseVertexAITests: XCTestCase {
         }
 
         func testConvertedResults() throws {
-            guard let functions = FunctionContainer().firebaseVertexAITools.first?.functions else {
+            guard let tool = FunctionContainer().firebaseVertexAITools.first else {
                 XCTFail("Conainer should contain some functions")
                 return
             }
 
+            let encodedToolData = try JSONEncoder().encode(tool)
+            let jsonObject = try JSONSerialization.jsonObject(with: encodedToolData)
+
+            guard let toolDictionary = jsonObject as? [String: Any] else {
+                XCTFail("Failed to convert to JSON object")
+                return
+            }
+
+            guard let functions = toolDictionary["functionDeclarations"] as? [[String: Any]] else {
+                XCTFail("Failed to convert to JSON object")
+                return
+            }
+
             XCTAssertEqual(functions.count, 2)
 
-            let getWeather = try XCTUnwrap(functions.first)
-            XCTAssertEqual(getWeather.getName(), "getWeather")
+            let getWeather = try XCTUnwrap(functions.first(where: { $0["name"] as? String == "getWeather" }))
             // swiftlint:disable:next line_length
-            XCTAssertEqual(getWeather.getDescription(), "Return current weather of location that passed by the argument- Parameter location: location that I want to know how the weather- Returns: string of weather")
+            XCTAssertEqual(getWeather["description"] as? String, "Return current weather of location that passed by the argument- Parameter location: location that I want to know how the weather- Returns: string of weather")
 
-            let getStock = try XCTUnwrap(functions.last)
-            XCTAssertEqual(getStock.getName(), "getStock")
-            XCTAssertEqual(getStock.getDescription(), "")
+            let getStock = try XCTUnwrap(functions.first(where: { $0["name"] as? String == "getStock" }))
+            XCTAssertEqual(getStock["description"] as? String, "")
         }
 }