diff --git a/Package.swift b/Package.swift
index 2392491..a32efa1 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: "11.15.0")
+        .package(url: "https://github.com/firebase/firebase-ios-sdk.git", from: "12.1.0")
     ],
     targets: [
         // Targets are the basic building blocks of a package, defining a module or a test suite.
@@ -26,7 +26,7 @@ let package = Package(
             name: "FunctionCalling-FirebaseVertexAI",
             dependencies: [
                 .product(name: "FunctionCalling", package: "FunctionCalling"),
-                .product(name: "FirebaseVertexAI", package: "firebase-ios-sdk")
+                .product(name: "FirebaseAI", package: "firebase-ios-sdk")
             ]
         ),
         .testTarget(
diff --git a/Sources/FunctionCalling-FirebaseVertexAI/Extension/FirebaseAI+Extension.swift b/Sources/FunctionCalling-FirebaseVertexAI/Extension/FirebaseAI+Extension.swift
new file mode 100644
index 0000000..8ae7ed4
--- /dev/null
+++ b/Sources/FunctionCalling-FirebaseVertexAI/Extension/FirebaseAI+Extension.swift
@@ -0,0 +1,13 @@
+//
+//  FirebaseAI+Extension.swift
+//  FunctionCalling-FirebaseVertexAI
+//
+//  Created by 伊藤史 on 2025/08/06.
+//
+
+import FirebaseAI
+
+// FIXME: "Since specifying FirebaseAI.Tool results in the error 'Tool' is not a
+// member type of class 'FirebaseAI.FirebaseAI', I have no choice but to
+// specify a typealias
+public typealias FirebaseAITool = Tool
diff --git a/Sources/FunctionCalling-FirebaseVertexAI/Extension/InputSchema+Extension.swift b/Sources/FunctionCalling-FirebaseVertexAI/Extension/InputSchema+Extension.swift
index 28c6b6c..4ece6a0 100644
--- a/Sources/FunctionCalling-FirebaseVertexAI/Extension/InputSchema+Extension.swift
+++ b/Sources/FunctionCalling-FirebaseVertexAI/Extension/InputSchema+Extension.swift
@@ -6,10 +6,10 @@
 //
 
 import FunctionCalling
-import FirebaseVertexAI
+import FirebaseAI
 
 extension FunctionCalling.InputSchema {
-    var toSchema: FirebaseVertexAI.Schema {
+    var toSchema: Schema {
         switch type {
         case .string:
             return .string(
@@ -59,7 +59,7 @@ extension FunctionCalling.InputSchema {
 }
 
 extension Optional<String> {
-    var toStringFormat: FirebaseVertexAI.Schema.StringFormat? {
+    var toStringFormat: Schema.StringFormat? {
         guard let format = self else {
             return nil
         }
@@ -67,7 +67,7 @@ extension Optional<String> {
         return .custom(format)
     }
 
-    var toIntegerFormat: FirebaseVertexAI.Schema.IntegerFormat? {
+    var toIntegerFormat: Schema.IntegerFormat? {
         guard let format = self else {
             return nil
         }
diff --git a/Sources/FunctionCalling-FirebaseVertexAI/Extension/Tool+Extension.swift b/Sources/FunctionCalling-FirebaseVertexAI/Extension/Tool+Extension.swift
index 8a50960..755094a 100644
--- a/Sources/FunctionCalling-FirebaseVertexAI/Extension/Tool+Extension.swift
+++ b/Sources/FunctionCalling-FirebaseVertexAI/Extension/Tool+Extension.swift
@@ -6,11 +6,11 @@
 //
 
 import FunctionCalling
-import FirebaseVertexAI
+import FirebaseAI
 
 extension FunctionCalling.Tool {
-    var toFunctionDeclaration: FirebaseVertexAI.FunctionDeclaration {
-        let parameters: [String: FirebaseVertexAI.Schema] = {
+    var toFunctionDeclaration: FunctionDeclaration {
+        let parameters: [String: Schema] = {
             guard let properties = inputSchema.properties else {
                 return [:]
             }
diff --git a/Sources/FunctionCalling-FirebaseVertexAI/FunctionCalling_FirebaseVertexAI.swift b/Sources/FunctionCalling-FirebaseVertexAI/FunctionCalling_FirebaseVertexAI.swift
index cf3f4af..856cf7a 100644
--- a/Sources/FunctionCalling-FirebaseVertexAI/FunctionCalling_FirebaseVertexAI.swift
+++ b/Sources/FunctionCalling-FirebaseVertexAI/FunctionCalling_FirebaseVertexAI.swift
@@ -6,15 +6,14 @@
 //
 
 import FunctionCalling
-import FirebaseVertexAI
-import Foundation
+import FirebaseAI
 
 extension ToolContainer {
-    public var firebaseVertexAITools: [FirebaseVertexAI.Tool] {
+    public var firebaseVertexAITools: [FirebaseAITool] {
         guard let declarations = allTools?.compactMap({ $0.toFunctionDeclaration }) else {
             return [.functionDeclarations([])]
         }
 
-        return [FirebaseVertexAI.Tool.functionDeclarations(declarations)]
+        return [FirebaseAITool.functionDeclarations(declarations)]
     }
 }