diff --git a/Sources/KanaKanjiConverterModule/CIDData.swift b/Sources/KanaKanjiConverterModule/CIDData.swift
index 04e6be4..c0c270c 100644
--- a/Sources/KanaKanjiConverterModule/CIDData.swift
+++ b/Sources/KanaKanjiConverterModule/CIDData.swift
@@ -8,7 +8,7 @@
 
 import Foundation
 
-public enum CIDData {
+public enum CIDData: Sendable {
     static var totalCount: Int {
         1319
     }
diff --git a/Sources/KanaKanjiConverterModule/Candidate.swift b/Sources/KanaKanjiConverterModule/Candidate.swift
index be8b25c..eb5af89 100644
--- a/Sources/KanaKanjiConverterModule/Candidate.swift
+++ b/Sources/KanaKanjiConverterModule/Candidate.swift
@@ -62,13 +62,13 @@ struct CandidateData {
     }
 }
 
-public enum CompleteAction {
+public enum CompleteAction: Sendable {
     /// カーソルを調整する
     case moveCursor(Int)
 }
 
 /// 変換候補のデータ
-public struct Candidate {
+public struct Candidate: Sendable {
     /// 入力となるテキスト
     public var text: String
     /// 評価値
diff --git a/Sources/KanaKanjiConverterModule/ComposingText.swift b/Sources/KanaKanjiConverterModule/ComposingText.swift
index 7e025b7..fa7b213 100644
--- a/Sources/KanaKanjiConverterModule/ComposingText.swift
+++ b/Sources/KanaKanjiConverterModule/ComposingText.swift
@@ -14,7 +14,7 @@ import SwiftUtils
 /// のようになる。`
 /// カーソルのポジションもこのクラスが管理する。
 /// 設計方針として、inputStyleに関わる実装の違いは全てアップデート方法の違いとして吸収し、`input` / `delete` / `moveCursor` / `complete`時の違いとしては露出させないようにすることを目指した。
-public struct ComposingText {
+public struct ComposingText: Sendable {
     public init(convertTargetCursorPosition: Int = 0, input: [ComposingText.InputElement] = [], convertTarget: String = "") {
         self.convertTargetCursorPosition = convertTargetCursorPosition
         self.input = input
@@ -29,7 +29,7 @@ public struct ComposingText {
     public private(set) var convertTarget: String = ""
 
     /// ユーザ入力の単位
-    public struct InputElement {
+    public struct InputElement: Sendable {
         /// 入力された文字
         public var character: Character
         /// そのときの入力方式(ローマ字入力 / ダイレクト入力)
diff --git a/Sources/KanaKanjiConverterModule/Converter/ConvertRequestOptions.swift b/Sources/KanaKanjiConverterModule/Converter/ConvertRequestOptions.swift
index 1702f8f..be5429f 100644
--- a/Sources/KanaKanjiConverterModule/Converter/ConvertRequestOptions.swift
+++ b/Sources/KanaKanjiConverterModule/Converter/ConvertRequestOptions.swift
@@ -8,7 +8,7 @@
 
 import Foundation
 
-public struct ConvertRequestOptions {
+public struct ConvertRequestOptions: Sendable {
     /// 変換リクエストに必要な設定データ
     ///
     /// - parameters:
@@ -91,7 +91,7 @@ public struct ConvertRequestOptions {
         )
     }
 
-    public struct Metadata {
+    public struct Metadata: Sendable {
         /// - parameters:
         ///   - appVersionString: アプリのバージョンを指定します。このデータは`KanaKanjiCovnerter.toVersionCandidate(_:)`などで用いられます。
         public init(appVersionString: String) {
diff --git a/Sources/KanaKanjiConverterModule/DicdataStore/DicdataElement.swift b/Sources/KanaKanjiConverterModule/DicdataStore/DicdataElement.swift
index 027ecef..56a0a92 100644
--- a/Sources/KanaKanjiConverterModule/DicdataStore/DicdataElement.swift
+++ b/Sources/KanaKanjiConverterModule/DicdataStore/DicdataElement.swift
@@ -8,7 +8,7 @@
 
 import Foundation
 
-public struct DicdataElement: Equatable, Hashable {
+public struct DicdataElement: Equatable, Hashable, Sendable {
     static let BOSData = Self(word: "", ruby: "", cid: CIDData.BOS.cid, mid: MIDData.BOS.mid, value: 0, adjust: 0)
     static let EOSData = Self(word: "", ruby: "", cid: CIDData.EOS.cid, mid: MIDData.EOS.mid, value: 0, adjust: 0)
 
diff --git a/Sources/KanaKanjiConverterModule/MIDData.swift b/Sources/KanaKanjiConverterModule/MIDData.swift
index add411e..17e809c 100644
--- a/Sources/KanaKanjiConverterModule/MIDData.swift
+++ b/Sources/KanaKanjiConverterModule/MIDData.swift
@@ -8,7 +8,7 @@
 
 import Foundation
 
-public enum MIDData {
+public enum MIDData: Sendable {
     static var totalCount: Int {
         503
     }
diff --git a/Sources/KanaKanjiConverterModule/Replacer/TextReplacer.swift b/Sources/KanaKanjiConverterModule/Replacer/TextReplacer.swift
index 6165516..b9b7e92 100644
--- a/Sources/KanaKanjiConverterModule/Replacer/TextReplacer.swift
+++ b/Sources/KanaKanjiConverterModule/Replacer/TextReplacer.swift
@@ -74,7 +74,7 @@ public struct TextReplacer {
         return results
     }
 
-    public struct SearchResultItem {
+    public struct SearchResultItem: Sendable {
         public var query: String
         public var text: String
         public var inputable: Bool {
@@ -113,7 +113,7 @@ public struct TextReplacer {
     }
 }
 
-public struct ReplacementCandidate {
+public struct ReplacementCandidate: Sendable {
     public var target: String
     public var replace: String
     public var base: String
diff --git a/Sources/KanaKanjiConverterModule/States.swift b/Sources/KanaKanjiConverterModule/States.swift
index b831ae8..11caba5 100644
--- a/Sources/KanaKanjiConverterModule/States.swift
+++ b/Sources/KanaKanjiConverterModule/States.swift
@@ -5,7 +5,7 @@
 //  Created by ensan on 2023/04/30.
 //
 
-public enum InputStyle: String {
+public enum InputStyle: String, Sendable {
     /// 入力された文字を直接入力するスタイル
     case direct = "direct"
     /// ローマ字日本語入力とするスタイル
@@ -19,7 +19,7 @@ public enum KeyboardLanguage: String, Codable, Equatable, Sendable {
     case none
 }
 
-public enum LearningType: Int, CaseIterable {
+public enum LearningType: Int, CaseIterable, Sendable {
     case inputAndOutput
     case onlyOutput
     case nothing
@@ -33,13 +33,13 @@ public enum LearningType: Int, CaseIterable {
     }
 }
 
-public enum ConverterBehaviorSemantics {
+public enum ConverterBehaviorSemantics: Sendable {
     /// 標準的な日本語入力のように、変換する候補を選ぶパターン
     case conversion
     /// iOSの英語入力のように、確定は不要だが、左右の文字列の置き換え候補が出てくるパターン
     case replacement([ReplacementTarget])
 
-    public enum ReplacementTarget: UInt8 {
+    public enum ReplacementTarget: UInt8, Sendable {
         case emoji
     }
 }
diff --git a/Sources/KanaKanjiConverterModule/TemplateData.swift b/Sources/KanaKanjiConverterModule/TemplateData.swift
index 9600c23..4f27106 100644
--- a/Sources/KanaKanjiConverterModule/TemplateData.swift
+++ b/Sources/KanaKanjiConverterModule/TemplateData.swift
@@ -9,7 +9,7 @@
 import Foundation
 import SwiftUtils
 
-public struct TemplateData: Codable {
+public struct TemplateData: Codable, Sendable {
     public var name: String
     public var literal: any TemplateLiteralProtocol
     public var type: TemplateLiteralType
@@ -92,13 +92,13 @@ public struct TemplateData: Codable {
     }
 }
 
-public protocol TemplateLiteralProtocol {
+public protocol TemplateLiteralProtocol: Sendable {
     func export() -> String
 
     func previewString() -> String
 }
 
-public enum TemplateLiteralType {
+public enum TemplateLiteralType: Sendable {
     case date
     case random
 }
@@ -113,7 +113,7 @@ public extension TemplateLiteralProtocol {
     }
 }
 
-public struct DateTemplateLiteral: TemplateLiteralProtocol, Equatable {
+public struct DateTemplateLiteral: TemplateLiteralProtocol, Equatable, Sendable {
     public init(format: String, type: DateTemplateLiteral.CalendarType, language: DateTemplateLiteral.Language, delta: String, deltaUnit: Int) {
         self.format = format
         self.type = type
@@ -129,7 +129,7 @@ public struct DateTemplateLiteral: TemplateLiteralProtocol, Equatable {
     public var delta: String
     public var deltaUnit: Int
 
-    public enum CalendarType: String {
+    public enum CalendarType: String, Sendable {
         case western
         case japanese
 
@@ -143,7 +143,7 @@ public struct DateTemplateLiteral: TemplateLiteralProtocol, Equatable {
         }
     }
 
-    public enum Language: String {
+    public enum Language: String, Sendable {
         case english = "en_US"
         case japanese = "ja_JP"
 
@@ -183,7 +183,7 @@ public struct DateTemplateLiteral: TemplateLiteralProtocol, Equatable {
     }
 }
 
-public struct RandomTemplateLiteral: TemplateLiteralProtocol, Equatable {
+public struct RandomTemplateLiteral: TemplateLiteralProtocol, Equatable, Sendable {
     public init(value: RandomTemplateLiteral.Value) {
         self.value = value
     }
@@ -192,12 +192,12 @@ public struct RandomTemplateLiteral: TemplateLiteralProtocol, Equatable {
         lhs.value == rhs.value
     }
 
-    public enum ValueType: String {
+    public enum ValueType: String, Sendable {
         case int
         case double
         case string
     }
-    public enum Value: Equatable {
+    public enum Value: Equatable, Sendable {
         case int(from: Int, to: Int)
         case double(from: Double, to: Double)
         case string([String])
diff --git a/Sources/SwiftUtils/AppVersion.swift b/Sources/SwiftUtils/AppVersion.swift
index c5e839f..d5f647d 100644
--- a/Sources/SwiftUtils/AppVersion.swift
+++ b/Sources/SwiftUtils/AppVersion.swift
@@ -13,7 +13,7 @@ import Foundation
 /// It is initialized with a string that represents a version of an app.
 /// The string must be in the format of "major.minor.patch".
 /// The string must not contain any other characters than numbers and dots.
-public struct AppVersion: Codable, Equatable, Comparable, Hashable, LosslessStringConvertible, CustomStringConvertible {
+public struct AppVersion: Codable, Equatable, Comparable, Hashable, LosslessStringConvertible, CustomStringConvertible, Sendable {
 
     /// ParseError is an enum that represents an error that occurs when parsing a string to an AppVersion.
     private enum ParseError: Error {