diff --git a/src/main/kotlin/dev/usbharu/hideout/Application.kt b/src/main/kotlin/dev/usbharu/hideout/Application.kt
deleted file mode 100644
index 5b1530a4..00000000
--- a/src/main/kotlin/dev/usbharu/hideout/Application.kt
+++ /dev/null
@@ -1,172 +0,0 @@
-package dev.usbharu.hideout
-
-import com.auth0.jwk.JwkProvider
-import com.auth0.jwk.JwkProviderBuilder
-import com.fasterxml.jackson.annotation.JsonInclude
-import com.fasterxml.jackson.databind.DeserializationFeature
-import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
-import dev.usbharu.hideout.config.CharacterLimit
-import dev.usbharu.hideout.config.Config
-import dev.usbharu.hideout.config.ConfigData
-import dev.usbharu.hideout.domain.model.job.DeliverPostJob
-import dev.usbharu.hideout.domain.model.job.DeliverReactionJob
-import dev.usbharu.hideout.domain.model.job.DeliverRemoveReactionJob
-import dev.usbharu.hideout.domain.model.job.ReceiveFollowJob
-import dev.usbharu.hideout.plugins.*
-import dev.usbharu.hideout.query.FollowerQueryService
-import dev.usbharu.hideout.query.UserQueryService
-import dev.usbharu.hideout.routing.register
-import dev.usbharu.hideout.service.ap.APService
-import dev.usbharu.hideout.service.ap.APUserService
-import dev.usbharu.hideout.service.api.PostApiService
-import dev.usbharu.hideout.service.api.UserApiService
-import dev.usbharu.hideout.service.api.UserAuthApiService
-import dev.usbharu.hideout.service.api.WebFingerApiService
-import dev.usbharu.hideout.service.auth.HttpSignatureVerifyService
-import dev.usbharu.hideout.service.core.*
-import dev.usbharu.hideout.service.job.JobQueueParentService
-import dev.usbharu.hideout.service.job.KJobJobQueueParentService
-import dev.usbharu.hideout.service.user.UserService
-import dev.usbharu.kjob.exposed.ExposedKJob
-import io.ktor.client.*
-import io.ktor.client.engine.cio.*
-import io.ktor.client.plugins.logging.*
-import io.ktor.server.application.*
-import kjob.core.kjob
-import kotlinx.coroutines.runBlocking
-import org.jetbrains.exposed.sql.Database
-import org.koin.ksp.generated.module
-import org.koin.ktor.ext.inject
-import java.util.concurrent.TimeUnit
-
-@Deprecated("Ktor is deprecated")
-fun main(args: Array<String>): Unit = io.ktor.server.cio.EngineMain.main(args)
-
-val Application.property: Application.(propertyName: String) -> String
-    get() = {
-        environment.config.property(it).getString()
-    }
-
-val Application.propertyOrNull: Application.(propertyName: String) -> String?
-    get() = {
-        environment.config.propertyOrNull(it)?.getString()
-    }
-
-// application.conf references the main function. This annotation prevents the IDE from marking it as unused.
-@Deprecated("Ktor is deprecated")
-@Suppress("unused", "LongMethod")
-fun Application.parent() {
-    Config.configData = ConfigData(
-        url = property("hideout.url"),
-        objectMapper = jacksonObjectMapper().enable(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY)
-            .setSerializationInclusion(JsonInclude.Include.NON_EMPTY)
-            .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false),
-        characterLimit = CharacterLimit(
-            general = CharacterLimit.General.of(
-                url = propertyOrNull("hideout.character-limit.general.url")?.toIntOrNull(),
-                domain = propertyOrNull("hideout.character-limit.general.domain")?.toIntOrNull(),
-                publicKey = propertyOrNull("hideout.character-limit.general.publicKey")?.toIntOrNull(),
-                privateKey = propertyOrNull("hideout.character-limit.general.privateKey")?.toIntOrNull()
-            )
-        )
-    )
-
-    val module = org.koin.dsl.module {
-        single<Database> {
-            Database.connect(
-                url = property("hideout.database.url"),
-                driver = property("hideout.database.driver"),
-                user = property("hideout.database.username"),
-                password = property("hideout.database.password")
-            )
-        }
-        single<JobQueueParentService> {
-            val kJobJobQueueService = KJobJobQueueParentService(get())
-            kJobJobQueueService.init(emptyList())
-            kJobJobQueueService
-        }
-        single<HttpClient> {
-            HttpClient(CIO).config {
-                install(Logging) {
-                    logger = Logger.DEFAULT
-                    level = LogLevel.INFO
-                }
-                install(httpSignaturePlugin) {
-                    keyMap = KtorKeyMap(get(), get())
-                }
-                expectSuccess = true
-            }
-        }
-        single<IdGenerateService> { TwitterSnowflakeIdGenerateService }
-        single<JwkProvider> {
-            JwkProviderBuilder(Config.configData.url).cached(
-                10,
-                24,
-                TimeUnit.HOURS
-            )
-                .rateLimited(10, 1, TimeUnit.MINUTES).build()
-        }
-    }
-    configureKoin(module, HideoutModule().module)
-    configureStatusPages()
-    runBlocking {
-        inject<ServerInitialiseService>().value.init()
-    }
-    configureCompression()
-    configureHTTP()
-    configureStaticRouting()
-    configureMonitoring()
-    configureSerialization()
-    register(inject<UserApiService>().value)
-    configureSecurity(
-
-        inject<JwkProvider>().value,
-        inject<MetaService>().value
-    )
-    configureRouting(
-        httpSignatureVerifyService = inject<HttpSignatureVerifyService>().value,
-        apService = inject<APService>().value,
-        userService = inject<UserService>().value,
-        apUserService = inject<APUserService>().value,
-        postService = inject<PostApiService>().value,
-        userApiService = inject<UserApiService>().value,
-        userQueryService = inject<UserQueryService>().value,
-        followerQueryService = inject<FollowerQueryService>().value,
-        userAuthApiService = inject<UserAuthApiService>().value,
-        webFingerApiService = inject<WebFingerApiService>().value,
-        transaction = inject<Transaction>().value
-    )
-}
-
-@Deprecated("Ktor is deprecated")
-@Suppress("unused")
-fun Application.worker() {
-    val kJob = kjob(ExposedKJob) {
-        connectionDatabase = inject<Database>().value
-    }.start()
-
-    val apService = inject<APService>().value
-
-    kJob.register(ReceiveFollowJob) {
-        execute {
-            apService.processActivity(this, it)
-        }
-    }
-    kJob.register(DeliverPostJob) {
-        execute {
-            apService.processActivity(this, it)
-        }
-    }
-
-    kJob.register(DeliverReactionJob) {
-        execute {
-            apService.processActivity(this, it)
-        }
-    }
-
-    kJob.register(DeliverRemoveReactionJob) {
-        execute {
-            apService.processActivity(this, it)
-        }
-    }
-}
diff --git a/src/main/kotlin/dev/usbharu/hideout/plugins/ActivityPub.kt b/src/main/kotlin/dev/usbharu/hideout/plugins/ActivityPub.kt
index f501fa98..a3e61051 100644
--- a/src/main/kotlin/dev/usbharu/hideout/plugins/ActivityPub.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/plugins/ActivityPub.kt
@@ -11,8 +11,6 @@ import io.ktor.client.plugins.api.*
 import io.ktor.client.request.*
 import io.ktor.client.statement.*
 import io.ktor.http.*
-import io.ktor.server.application.*
-import io.ktor.server.response.*
 import kotlinx.coroutines.runBlocking
 import tech.barbero.http.message.signing.HttpMessage
 import tech.barbero.http.message.signing.HttpMessageSigner
@@ -28,12 +26,6 @@ import java.text.SimpleDateFormat
 import java.util.*
 import javax.crypto.SecretKey
 
-suspend fun <T : JsonLd> ApplicationCall.respondAp(message: T, status: HttpStatusCode = HttpStatusCode.OK) {
-    message.context += "https://www.w3.org/ns/activitystreams"
-    val activityJson = Config.configData.objectMapper.writeValueAsString(message)
-    respondText(activityJson, ContentType.Application.Activity, status)
-}
-
 suspend fun HttpClient.postAp(urlString: String, username: String, jsonLd: JsonLd): HttpResponse {
     jsonLd.context += "https://www.w3.org/ns/activitystreams"
     return this.post(urlString) {
diff --git a/src/main/kotlin/dev/usbharu/hideout/plugins/Compression.kt b/src/main/kotlin/dev/usbharu/hideout/plugins/Compression.kt
deleted file mode 100644
index d1387d28..00000000
--- a/src/main/kotlin/dev/usbharu/hideout/plugins/Compression.kt
+++ /dev/null
@@ -1,20 +0,0 @@
-package dev.usbharu.hideout.plugins
-
-import io.ktor.http.*
-import io.ktor.server.application.*
-import io.ktor.server.plugins.compression.*
-
-@Deprecated("Ktor is deprecated")
-fun Application.configureCompression() {
-    install(Compression) {
-        gzip {
-            matchContentType(ContentType.Application.JavaScript)
-            priority = 1.0
-        }
-        deflate {
-            matchContentType(ContentType.Application.JavaScript)
-            priority = 10.0
-            minimumSize(1024) // condition
-        }
-    }
-}
diff --git a/src/main/kotlin/dev/usbharu/hideout/plugins/HTTP.kt b/src/main/kotlin/dev/usbharu/hideout/plugins/HTTP.kt
deleted file mode 100644
index 44f88bbd..00000000
--- a/src/main/kotlin/dev/usbharu/hideout/plugins/HTTP.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package dev.usbharu.hideout.plugins
-
-import io.ktor.server.application.*
-import io.ktor.server.plugins.defaultheaders.*
-import io.ktor.server.plugins.forwardedheaders.*
-
-@Deprecated("Ktor is deprecated")
-fun Application.configureHTTP() {
-//    install(CORS) {
-//        allowMethod(HttpMethod.Options)
-//        allowMethod(HttpMethod.Put)
-//        allowMethod(HttpMethod.Delete)
-//        allowMethod(HttpMethod.Patch)
-//        allowHeader(HttpHeaders.Authorization)
-//        allow
-//        allowHeader("MyCustomHeader")
-//        anyHost() // @TODO: Don't do this in production if possible. Try to limit it.
-//    }
-    install(DefaultHeaders) {
-        header("X-Engine", "Ktor") // will send this header with each response
-    }
-    install(ForwardedHeaders) // WARNING: for security, do not include this if not behind a reverse proxy
-    install(XForwardedHeaders) // WARNING: for security, do not include this if not behind a reverse proxy
-}
diff --git a/src/main/kotlin/dev/usbharu/hideout/plugins/Koin.kt b/src/main/kotlin/dev/usbharu/hideout/plugins/Koin.kt
deleted file mode 100644
index a7b1ed16..00000000
--- a/src/main/kotlin/dev/usbharu/hideout/plugins/Koin.kt
+++ /dev/null
@@ -1,14 +0,0 @@
-package dev.usbharu.hideout.plugins
-
-import io.ktor.server.application.*
-import org.koin.core.module.Module
-import org.koin.ktor.plugin.Koin
-import org.koin.logger.slf4jLogger
-
-@Deprecated("Ktor is deprecated")
-fun Application.configureKoin(vararg module: Module) {
-    install(Koin) {
-        slf4jLogger()
-        modules(*module)
-    }
-}
diff --git a/src/main/kotlin/dev/usbharu/hideout/plugins/Monitoring.kt b/src/main/kotlin/dev/usbharu/hideout/plugins/Monitoring.kt
deleted file mode 100644
index a2345312..00000000
--- a/src/main/kotlin/dev/usbharu/hideout/plugins/Monitoring.kt
+++ /dev/null
@@ -1,12 +0,0 @@
-package dev.usbharu.hideout.plugins
-
-import io.ktor.server.application.*
-import io.ktor.server.plugins.callloging.*
-import org.slf4j.event.Level
-
-@Deprecated("Ktor is deprecated")
-fun Application.configureMonitoring() {
-    install(CallLogging) {
-        level = Level.INFO
-    }
-}
diff --git a/src/main/kotlin/dev/usbharu/hideout/plugins/Routing.kt b/src/main/kotlin/dev/usbharu/hideout/plugins/Routing.kt
deleted file mode 100644
index 7a11e3be..00000000
--- a/src/main/kotlin/dev/usbharu/hideout/plugins/Routing.kt
+++ /dev/null
@@ -1,52 +0,0 @@
-package dev.usbharu.hideout.plugins
-
-import dev.usbharu.hideout.query.FollowerQueryService
-import dev.usbharu.hideout.query.UserQueryService
-import dev.usbharu.hideout.routing.activitypub.inbox
-import dev.usbharu.hideout.routing.activitypub.outbox
-import dev.usbharu.hideout.routing.activitypub.usersAP
-import dev.usbharu.hideout.routing.api.internal.v1.auth
-import dev.usbharu.hideout.routing.api.internal.v1.posts
-import dev.usbharu.hideout.routing.api.internal.v1.users
-import dev.usbharu.hideout.routing.wellknown.webfinger
-import dev.usbharu.hideout.service.ap.APService
-import dev.usbharu.hideout.service.ap.APUserService
-import dev.usbharu.hideout.service.api.PostApiService
-import dev.usbharu.hideout.service.api.UserApiService
-import dev.usbharu.hideout.service.api.UserAuthApiService
-import dev.usbharu.hideout.service.api.WebFingerApiService
-import dev.usbharu.hideout.service.auth.HttpSignatureVerifyService
-import dev.usbharu.hideout.service.core.Transaction
-import dev.usbharu.hideout.service.user.UserService
-import io.ktor.server.application.*
-import io.ktor.server.plugins.autohead.*
-import io.ktor.server.routing.*
-
-@Deprecated("Ktor is deprecated")
-@Suppress("LongParameterList")
-fun Application.configureRouting(
-    httpSignatureVerifyService: HttpSignatureVerifyService,
-    apService: APService,
-    userService: UserService,
-    apUserService: APUserService,
-    postService: PostApiService,
-    userApiService: UserApiService,
-    userQueryService: UserQueryService,
-    followerQueryService: FollowerQueryService,
-    userAuthApiService: UserAuthApiService,
-    webFingerApiService: WebFingerApiService,
-    transaction: Transaction
-) {
-    install(AutoHeadResponse)
-    routing {
-        inbox(httpSignatureVerifyService, apService)
-        outbox()
-        usersAP(apUserService, userQueryService, followerQueryService, transaction)
-        webfinger(webFingerApiService)
-        route("/api/internal/v1") {
-            posts(postService)
-            users(userService, userApiService)
-            auth(userAuthApiService)
-        }
-    }
-}
diff --git a/src/main/kotlin/dev/usbharu/hideout/plugins/Security.kt b/src/main/kotlin/dev/usbharu/hideout/plugins/Security.kt
deleted file mode 100644
index 104c5844..00000000
--- a/src/main/kotlin/dev/usbharu/hideout/plugins/Security.kt
+++ /dev/null
@@ -1,51 +0,0 @@
-package dev.usbharu.hideout.plugins
-
-import com.auth0.jwk.JwkProvider
-import dev.usbharu.hideout.config.Config
-import dev.usbharu.hideout.service.core.MetaService
-import dev.usbharu.hideout.util.JsonWebKeyUtil
-import io.ktor.http.*
-import io.ktor.server.application.*
-import io.ktor.server.auth.*
-import io.ktor.server.auth.jwt.*
-import io.ktor.server.response.*
-import io.ktor.server.routing.*
-
-const val TOKEN_AUTH = "jwt-auth"
-
-@Deprecated("Ktor is deprecated")
-@Suppress("MagicNumber")
-fun Application.configureSecurity(
-    jwkProvider: JwkProvider,
-    metaService: MetaService
-) {
-    val issuer = Config.configData.url
-    install(Authentication) {
-        jwt(TOKEN_AUTH) {
-            verifier(jwkProvider, issuer) {
-                acceptLeeway(3)
-            }
-            validate { jwtCredential ->
-                val uid = jwtCredential.payload.getClaim("uid")
-                if (uid.isMissing) {
-                    return@validate null
-                }
-                if (uid.asLong() == null) {
-                    return@validate null
-                }
-                return@validate JWTPrincipal(jwtCredential.payload)
-            }
-        }
-    }
-
-    routing {
-        get("/.well-known/jwks.json") {
-            //language=JSON
-            val jwt = metaService.getJwtMeta()
-            call.respondText(
-                contentType = ContentType.Application.Json,
-                text = JsonWebKeyUtil.publicKeyToJwk(jwt.publicKey, jwt.kid.toString())
-            )
-        }
-    }
-}
diff --git a/src/main/kotlin/dev/usbharu/hideout/plugins/Serialization.kt b/src/main/kotlin/dev/usbharu/hideout/plugins/Serialization.kt
deleted file mode 100644
index 1e81e2e7..00000000
--- a/src/main/kotlin/dev/usbharu/hideout/plugins/Serialization.kt
+++ /dev/null
@@ -1,21 +0,0 @@
-package dev.usbharu.hideout.plugins
-
-import com.fasterxml.jackson.annotation.JsonInclude
-import com.fasterxml.jackson.annotation.JsonSetter
-import com.fasterxml.jackson.annotation.Nulls
-import com.fasterxml.jackson.databind.DeserializationFeature
-import io.ktor.serialization.jackson.*
-import io.ktor.server.application.*
-import io.ktor.server.plugins.contentnegotiation.*
-
-@Deprecated("Ktor is deprecated")
-fun Application.configureSerialization() {
-    install(ContentNegotiation) {
-        jackson {
-            enable(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY)
-            setSerializationInclusion(JsonInclude.Include.NON_EMPTY)
-            configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
-            configOverride(List::class.java).setSetterInfo(JsonSetter.Value.forContentNulls(Nulls.AS_EMPTY))
-        }
-    }
-}
diff --git a/src/main/kotlin/dev/usbharu/hideout/plugins/StaticRouting.kt b/src/main/kotlin/dev/usbharu/hideout/plugins/StaticRouting.kt
deleted file mode 100644
index c4cc37d6..00000000
--- a/src/main/kotlin/dev/usbharu/hideout/plugins/StaticRouting.kt
+++ /dev/null
@@ -1,22 +0,0 @@
-package dev.usbharu.hideout.plugins
-
-import io.ktor.http.*
-import io.ktor.server.application.*
-import io.ktor.server.http.content.*
-import io.ktor.server.response.*
-import io.ktor.server.routing.*
-
-@Deprecated("Ktor is deprecated")
-fun Application.configureStaticRouting() {
-    routing {
-        get("/") {
-            call.respondText(
-                String.javaClass.classLoader.getResourceAsStream("static/index.html").readAllBytes().decodeToString(),
-                contentType = ContentType.Text.Html
-            )
-        }
-        static("/") {
-            resources("static")
-        }
-    }
-}
diff --git a/src/main/kotlin/dev/usbharu/hideout/plugins/StatusPages.kt b/src/main/kotlin/dev/usbharu/hideout/plugins/StatusPages.kt
deleted file mode 100644
index 9a9ea5ac..00000000
--- a/src/main/kotlin/dev/usbharu/hideout/plugins/StatusPages.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package dev.usbharu.hideout.plugins
-
-import dev.usbharu.hideout.exception.InvalidUsernameOrPasswordException
-import io.ktor.http.*
-import io.ktor.server.application.*
-import io.ktor.server.plugins.statuspages.*
-import io.ktor.server.response.*
-
-@Deprecated("Ktor is deprecated")
-fun Application.configureStatusPages() {
-    install(StatusPages) {
-        exception<IllegalArgumentException> { call, cause ->
-            call.respondText(text = "400: $cause", status = HttpStatusCode.BadRequest)
-            call.application.log.warn("Bad Request", cause)
-        }
-        exception<InvalidUsernameOrPasswordException> { call, _ ->
-            call.respond(HttpStatusCode.Unauthorized)
-        }
-        exception<Throwable> { call, cause ->
-            call.respondText(text = "500: ${cause.stackTraceToString()}", status = HttpStatusCode.InternalServerError)
-            call.application.log.error("Internal Server Error", cause)
-        }
-    }
-}
diff --git a/src/main/kotlin/dev/usbharu/hideout/routing/RegisterRouting.kt b/src/main/kotlin/dev/usbharu/hideout/routing/RegisterRouting.kt
deleted file mode 100644
index 232ee918..00000000
--- a/src/main/kotlin/dev/usbharu/hideout/routing/RegisterRouting.kt
+++ /dev/null
@@ -1,44 +0,0 @@
-package dev.usbharu.hideout.routing
-
-import dev.usbharu.hideout.service.api.UserApiService
-import io.ktor.http.*
-import io.ktor.server.application.*
-import io.ktor.server.auth.*
-import io.ktor.server.request.*
-import io.ktor.server.response.*
-import io.ktor.server.routing.*
-
-@Deprecated("Ktor is deprecated")
-fun Application.register(userApiService: UserApiService) {
-    routing {
-        get("/register") {
-            val principal = call.principal<UserIdPrincipal>()
-            if (principal != null) {
-                call.respondRedirect("/users/${principal.name}")
-            }
-            call.respondText(ContentType.Text.Html) {
-                //language=HTML
-                """
-                    <html>
-                    <head>
-                    </head>
-                    <body>
-                    <form method='post' action=''>
-                    <input type='text' name='username' value=''>
-                    <input type='password' name='password'>
-                    <input type="submit">
-                    </form>
-                    </body>
-                    </html>
-                """.trimIndent()
-            }
-        }
-        post("/register") {
-            val parameters = call.receiveParameters()
-            val password = parameters["password"] ?: return@post call.respondRedirect("/register")
-            val username = parameters["username"] ?: return@post call.respondRedirect("/register")
-            userApiService.createUser(username, password)
-            call.respondRedirect("/users/$username")
-        }
-    }
-}
diff --git a/src/main/kotlin/dev/usbharu/hideout/routing/activitypub/InboxRouting.kt b/src/main/kotlin/dev/usbharu/hideout/routing/activitypub/InboxRouting.kt
deleted file mode 100644
index e1204f39..00000000
--- a/src/main/kotlin/dev/usbharu/hideout/routing/activitypub/InboxRouting.kt
+++ /dev/null
@@ -1,77 +0,0 @@
-package dev.usbharu.hideout.routing.activitypub
-
-import dev.usbharu.hideout.config.Config
-import dev.usbharu.hideout.domain.model.ActivityPubObjectResponse
-import dev.usbharu.hideout.domain.model.ActivityPubStringResponse
-import dev.usbharu.hideout.exception.HttpSignatureVerifyException
-import dev.usbharu.hideout.service.auth.HttpSignatureVerifyService
-import io.ktor.http.*
-import io.ktor.server.application.*
-import io.ktor.server.request.*
-import io.ktor.server.response.*
-import io.ktor.server.routing.*
-
-@Deprecated("Ktor is deprecated")
-fun Routing.inbox(
-    httpSignatureVerifyService: HttpSignatureVerifyService,
-    apService: dev.usbharu.hideout.service.ap.APService
-) {
-    route("/inbox") {
-        get {
-            call.respond(HttpStatusCode.MethodNotAllowed)
-        }
-        post {
-            if (httpSignatureVerifyService.verify(call.request.headers).not()) {
-                throw HttpSignatureVerifyException()
-            }
-            val json = call.receiveText()
-            call.application.log.trace("Received: $json")
-            val activityTypes = apService.parseActivity(json)
-            call.application.log.debug("ActivityTypes: ${activityTypes.name}")
-            val response = apService.processActivity(json, activityTypes)
-            when (response) {
-                is ActivityPubObjectResponse -> call.respond(
-                    response.httpStatusCode,
-                    Config.configData.objectMapper.writeValueAsString(
-                        response.message.apply {
-                            context =
-                                listOf("https://www.w3.org/ns/activitystreams")
-                        }
-                    )
-                )
-
-                is ActivityPubStringResponse -> call.respond(response.httpStatusCode, response.message)
-                null -> call.respond(HttpStatusCode.NotImplemented)
-            }
-        }
-    }
-    route("/users/{name}/inbox") {
-        get {
-            call.respond(HttpStatusCode.MethodNotAllowed)
-        }
-        post {
-            if (httpSignatureVerifyService.verify(call.request.headers).not()) {
-                throw HttpSignatureVerifyException()
-            }
-            val json = call.receiveText()
-            call.application.log.trace("Received: $json")
-            val activityTypes = apService.parseActivity(json)
-            call.application.log.debug("ActivityTypes: ${activityTypes.name}")
-            val response = apService.processActivity(json, activityTypes)
-            when (response) {
-                is ActivityPubObjectResponse -> call.respond(
-                    response.httpStatusCode,
-                    Config.configData.objectMapper.writeValueAsString(
-                        response.message.apply {
-                            context =
-                                listOf("https://www.w3.org/ns/activitystreams")
-                        }
-                    )
-                )
-
-                is ActivityPubStringResponse -> call.respond(response.httpStatusCode, response.message)
-                null -> call.respond(HttpStatusCode.NotImplemented)
-            }
-        }
-    }
-}
diff --git a/src/main/kotlin/dev/usbharu/hideout/routing/activitypub/OutboxRouting.kt b/src/main/kotlin/dev/usbharu/hideout/routing/activitypub/OutboxRouting.kt
deleted file mode 100644
index 9f6c2689..00000000
--- a/src/main/kotlin/dev/usbharu/hideout/routing/activitypub/OutboxRouting.kt
+++ /dev/null
@@ -1,26 +0,0 @@
-package dev.usbharu.hideout.routing.activitypub
-
-import io.ktor.http.*
-import io.ktor.server.application.*
-import io.ktor.server.response.*
-import io.ktor.server.routing.*
-
-@Deprecated("Ktor is deprecated")
-fun Routing.outbox() {
-    route("/outbox") {
-        get {
-            call.respond(HttpStatusCode.NotImplemented)
-        }
-        post {
-            call.respond(HttpStatusCode.NotImplemented)
-        }
-    }
-    route("/users/{name}/outbox") {
-        get {
-            call.respond(HttpStatusCode.NotImplemented)
-        }
-        post {
-            call.respond(HttpStatusCode.NotImplemented)
-        }
-    }
-}
diff --git a/src/main/kotlin/dev/usbharu/hideout/routing/activitypub/UserRouting.kt b/src/main/kotlin/dev/usbharu/hideout/routing/activitypub/UserRouting.kt
deleted file mode 100644
index 39d7a299..00000000
--- a/src/main/kotlin/dev/usbharu/hideout/routing/activitypub/UserRouting.kt
+++ /dev/null
@@ -1,65 +0,0 @@
-package dev.usbharu.hideout.routing.activitypub
-
-import dev.usbharu.hideout.config.Config
-import dev.usbharu.hideout.exception.ParameterNotExistException
-import dev.usbharu.hideout.plugins.respondAp
-import dev.usbharu.hideout.query.FollowerQueryService
-import dev.usbharu.hideout.query.UserQueryService
-import dev.usbharu.hideout.service.ap.APUserService
-import dev.usbharu.hideout.service.core.Transaction
-import dev.usbharu.hideout.util.HttpUtil.Activity
-import dev.usbharu.hideout.util.HttpUtil.JsonLd
-import io.ktor.http.*
-import io.ktor.server.application.*
-import io.ktor.server.request.*
-import io.ktor.server.response.*
-import io.ktor.server.routing.*
-
-@Deprecated("Ktor is deprecated")
-fun Routing.usersAP(
-    apUserService: APUserService,
-    userQueryService: UserQueryService,
-    followerQueryService: FollowerQueryService,
-    transaction: Transaction
-) {
-    route("/users/{name}") {
-        createChild(ContentTypeRouteSelector(ContentType.Application.Activity, ContentType.Application.JsonLd)).handle {
-            call.application.log.debug("Signature: ${call.request.header("Signature")}")
-            call.application.log.debug("Authorization: ${call.request.header("Authorization")}")
-            val name =
-                call.parameters["name"] ?: throw ParameterNotExistException("Parameter(name='name') does not exist.")
-            val person = apUserService.getPersonByName(name)
-            return@handle call.respondAp(person, HttpStatusCode.OK)
-        }
-        get {
-            // TODO: 暫定処置なので治す
-            transaction.transaction {
-                val userEntity = userQueryService.findByNameAndDomain(
-                    call.parameters["name"]
-                        ?: throw ParameterNotExistException("Parameter(name='name') does not exist."),
-                    Config.configData.domain
-                )
-                val personByName = apUserService.getPersonByName(userEntity.name)
-                call.respondText(
-                    userEntity.toString() + "\n" + followerQueryService.findFollowersById(userEntity.id) +
-                            "\n" + Config.configData.objectMapper.writeValueAsString(
-                        personByName
-                    )
-                )
-            }
-        }
-    }
-}
-
-@Deprecated("Ktor is deprecated")
-class ContentTypeRouteSelector(private vararg val contentType: ContentType) : RouteSelector() {
-    override fun evaluate(context: RoutingResolveContext, segmentIndex: Int): RouteSelectorEvaluation {
-        context.call.application.log.debug("Accept: ${context.call.request.accept()}")
-        val requestContentType = context.call.request.accept() ?: return RouteSelectorEvaluation.FailedParameter
-        return if (requestContentType.split(",").any { contentType.any { contentType -> contentType.match(it) } }) {
-            RouteSelectorEvaluation.Constant
-        } else {
-            RouteSelectorEvaluation.FailedParameter
-        }
-    }
-}
diff --git a/src/main/kotlin/dev/usbharu/hideout/routing/api/internal/v1/Auth.kt b/src/main/kotlin/dev/usbharu/hideout/routing/api/internal/v1/Auth.kt
deleted file mode 100644
index 4a70ab5b..00000000
--- a/src/main/kotlin/dev/usbharu/hideout/routing/api/internal/v1/Auth.kt
+++ /dev/null
@@ -1,32 +0,0 @@
-package dev.usbharu.hideout.routing.api.internal.v1
-
-import dev.usbharu.hideout.domain.model.hideout.form.RefreshToken
-import dev.usbharu.hideout.domain.model.hideout.form.UserLogin
-import dev.usbharu.hideout.plugins.TOKEN_AUTH
-import dev.usbharu.hideout.service.api.UserAuthApiService
-import io.ktor.server.application.*
-import io.ktor.server.auth.*
-import io.ktor.server.auth.jwt.*
-import io.ktor.server.request.*
-import io.ktor.server.response.*
-import io.ktor.server.routing.*
-
-@Deprecated("Ktor is deprecated")
-fun Route.auth(userAuthApiService: UserAuthApiService) {
-    post("/login") {
-        val loginUser = call.receive<UserLogin>()
-        return@post call.respond(userAuthApiService.login(loginUser.username, loginUser.password))
-    }
-
-    post("/refresh-token") {
-        val refreshToken = call.receive<RefreshToken>()
-        return@post call.respond(userAuthApiService.refreshToken(refreshToken))
-    }
-    authenticate(TOKEN_AUTH) {
-        get("/auth-check") {
-            val principal = call.principal<JWTPrincipal>() ?: throw IllegalStateException("no principal")
-            val username = principal.payload.getClaim("uid")
-            call.respondText("Hello $username")
-        }
-    }
-}
diff --git a/src/main/kotlin/dev/usbharu/hideout/routing/api/internal/v1/Posts.kt b/src/main/kotlin/dev/usbharu/hideout/routing/api/internal/v1/Posts.kt
deleted file mode 100644
index 3137bc6c..00000000
--- a/src/main/kotlin/dev/usbharu/hideout/routing/api/internal/v1/Posts.kt
+++ /dev/null
@@ -1,102 +0,0 @@
-package dev.usbharu.hideout.routing.api.internal.v1
-
-import dev.usbharu.hideout.domain.model.hideout.form.Post
-import dev.usbharu.hideout.domain.model.hideout.form.Reaction
-import dev.usbharu.hideout.exception.ParameterNotExistException
-import dev.usbharu.hideout.plugins.TOKEN_AUTH
-import dev.usbharu.hideout.service.api.PostApiService
-import dev.usbharu.hideout.util.InstantParseUtil
-import io.ktor.http.*
-import io.ktor.server.application.*
-import io.ktor.server.auth.*
-import io.ktor.server.auth.jwt.*
-import io.ktor.server.request.*
-import io.ktor.server.response.*
-import io.ktor.server.routing.*
-
-@Deprecated("Ktor is deprecated")
-@Suppress("LongMethod")
-fun Route.posts(postApiService: PostApiService) {
-    route("/posts") {
-        authenticate(TOKEN_AUTH) {
-            post {
-                val principal = call.principal<JWTPrincipal>() ?: throw IllegalStateException("no principal")
-                val userId = principal.payload.getClaim("uid").asLong()
-
-                val receive = call.receive<Post>()
-                val create = postApiService.createPost(receive, userId)
-                call.response.header("Location", create.url)
-                call.respond(HttpStatusCode.OK)
-            }
-            route("/{id}/reactions") {
-                get {
-                    val principal = call.principal<JWTPrincipal>() ?: throw IllegalStateException("no principal")
-                    val userId = principal.payload.getClaim("uid").asLong()
-                    val postId = (
-                        call.parameters["id"]?.toLong()
-                            ?: throw ParameterNotExistException("Parameter(id='postsId') does not exist.")
-                        )
-                    call.respond(postApiService.getReactionByPostId(postId, userId))
-                }
-                post {
-                    val jwtPrincipal = call.principal<JWTPrincipal>() ?: throw IllegalStateException("no principal")
-                    val userId = jwtPrincipal.payload.getClaim("uid").asLong()
-                    val postId = call.parameters["id"]?.toLong()
-                        ?: throw ParameterNotExistException("Parameter(id='postsId') does not exist.")
-                    val reaction = try {
-                        call.receive<Reaction>()
-                    } catch (_: ContentTransformationException) {
-                        Reaction(null)
-                    }
-
-                    postApiService.appendReaction(reaction.reaction ?: "❤", userId, postId)
-                    call.respond(HttpStatusCode.NoContent)
-                }
-                delete {
-                    val jwtPrincipal = call.principal<JWTPrincipal>() ?: throw IllegalStateException("no principal")
-                    val userId = jwtPrincipal.payload.getClaim("uid").asLong()
-                    val postId = call.parameters["id"]?.toLong()
-                        ?: throw ParameterNotExistException("Parameter(id='postsId') does not exist.")
-                    postApiService.removeReaction(userId, postId)
-                    call.respond(HttpStatusCode.NoContent)
-                }
-            }
-        }
-        authenticate(TOKEN_AUTH, optional = true) {
-            get {
-                val userId = call.principal<JWTPrincipal>()?.payload?.getClaim("uid")?.asLong()
-                val since = InstantParseUtil.parse(call.request.queryParameters["since"])
-                val until = InstantParseUtil.parse(call.request.queryParameters["until"])
-                val minId = call.request.queryParameters["minId"]?.toLong()
-                val maxId = call.request.queryParameters["maxId"]?.toLong()
-                val limit = call.request.queryParameters["limit"]?.toInt()
-                call.respond(HttpStatusCode.OK, postApiService.getAll(since, until, minId, maxId, limit, userId))
-            }
-            get("/{id}") {
-                val userId = call.principal<JWTPrincipal>()?.payload?.getClaim("uid")?.asLong()
-                val id = call.parameters["id"]?.toLong()
-                    ?: throw ParameterNotExistException("Parameter(id='postsId') does not exist.")
-                val post = postApiService.getById(id, userId)
-                call.respond(post)
-            }
-        }
-    }
-    route("/users/{name}/posts") {
-        authenticate(TOKEN_AUTH, optional = true) {
-            get {
-                val userId = call.principal<JWTPrincipal>()?.payload?.getClaim("uid")?.asLong()
-                val targetUserName = call.parameters["name"]
-                    ?: throw ParameterNotExistException("Parameter(name='userName@domain') does not exist.")
-                val posts = postApiService.getByUser(targetUserName, userId = userId)
-                call.respond(posts)
-            }
-            get("/{id}") {
-                val userId = call.principal<JWTPrincipal>()?.payload?.getClaim("uid")?.asLong()
-                val id = call.parameters["id"]?.toLong()
-                    ?: throw ParameterNotExistException("Parameter(name='postsId' does not exist.")
-                val post = postApiService.getById(id, userId)
-                call.respond(post)
-            }
-        }
-    }
-}
diff --git a/src/main/kotlin/dev/usbharu/hideout/routing/api/internal/v1/Users.kt b/src/main/kotlin/dev/usbharu/hideout/routing/api/internal/v1/Users.kt
deleted file mode 100644
index 96f4f198..00000000
--- a/src/main/kotlin/dev/usbharu/hideout/routing/api/internal/v1/Users.kt
+++ /dev/null
@@ -1,107 +0,0 @@
-package dev.usbharu.hideout.routing.api.internal.v1
-
-import dev.usbharu.hideout.config.Config
-import dev.usbharu.hideout.domain.model.hideout.dto.UserCreateDto
-import dev.usbharu.hideout.domain.model.hideout.form.UserCreate
-import dev.usbharu.hideout.exception.ParameterNotExistException
-import dev.usbharu.hideout.plugins.TOKEN_AUTH
-import dev.usbharu.hideout.service.api.UserApiService
-import dev.usbharu.hideout.service.user.UserService
-import dev.usbharu.hideout.util.AcctUtil
-import io.ktor.http.*
-import io.ktor.server.application.*
-import io.ktor.server.auth.*
-import io.ktor.server.auth.jwt.*
-import io.ktor.server.request.*
-import io.ktor.server.response.*
-import io.ktor.server.routing.*
-
-@Deprecated("Ktor is deprecated")
-@Suppress("LongMethod", "CognitiveComplexMethod")
-fun Route.users(userService: UserService, userApiService: UserApiService) {
-    route("/users") {
-        get {
-            call.respond(userApiService.findAll())
-        }
-        post {
-            val userCreate = call.receive<UserCreate>()
-            if (userService.usernameAlreadyUse(userCreate.username)) {
-                return@post call.respond(HttpStatusCode.BadRequest)
-            }
-            val user = userService.createLocalUser(
-                UserCreateDto(
-                    userCreate.username,
-                    userCreate.username,
-                    "",
-                    userCreate.password
-                )
-            )
-            call.response.header("Location", "${Config.configData.url}/api/internal/v1/users/${user.name}")
-            call.respond(HttpStatusCode.Created)
-        }
-        route("/{name}") {
-            authenticate(TOKEN_AUTH, optional = true) {
-                get {
-                    val userParameter = (
-                            call.parameters["name"]
-                                ?: throw ParameterNotExistException(
-                                    "Parameter(name='userName@domain') does not exist."
-                                )
-                            )
-                    if (userParameter.toLongOrNull() != null) {
-                        return@get call.respond(userApiService.findById(userParameter.toLong()))
-                    } else {
-                        val acct = AcctUtil.parse(userParameter)
-                        return@get call.respond(userApiService.findByAcct(acct))
-                    }
-                }
-            }
-
-            route("/followers") {
-                get {
-                    val userParameter = call.parameters["name"]
-                        ?: throw ParameterNotExistException("Parameter(name='userName@domain') does not exist.")
-                    if (userParameter.toLongOrNull() != null) {
-                        return@get call.respond(userApiService.findFollowers(userParameter.toLong()))
-                    }
-                    val acct = AcctUtil.parse(userParameter)
-                    return@get call.respond(userApiService.findFollowersByAcct(acct))
-                }
-                authenticate(TOKEN_AUTH) {
-                    post {
-                        val userId = call.principal<JWTPrincipal>()?.payload?.getClaim("uid")?.asLong()
-                            ?: throw IllegalStateException("no principal")
-                        val userParameter = call.parameters["name"]
-                            ?: throw ParameterNotExistException("Parameter(name='userName@domain') does not exist.")
-                        if (if (userParameter.toLongOrNull() != null) {
-                                userApiService.follow(userParameter.toLong(), userId)
-                            } else {
-                                val parse = AcctUtil.parse(userParameter)
-                                userApiService.follow(parse, userId)
-                            }
-                        ) {
-                            call.respond(HttpStatusCode.OK)
-                        } else {
-                            call.respond(HttpStatusCode.Accepted)
-                        }
-                    }
-                }
-            }
-            route("/following") {
-                get {
-                    val userParameter = (
-                            call.parameters["name"]
-                                ?: throw ParameterNotExistException(
-                                    "Parameter(name='userName@domain') does not exist."
-                                )
-                            )
-                    if (userParameter.toLongOrNull() != null) {
-                        return@get call.respond(userApiService.findFollowings(userParameter.toLong()))
-                    }
-                    val acct = AcctUtil.parse(userParameter)
-                    return@get call.respond(userApiService.findFollowingsByAcct(acct))
-                }
-            }
-        }
-    }
-}
diff --git a/src/main/kotlin/dev/usbharu/hideout/routing/api/mastodon/v1/Statuses.kt b/src/main/kotlin/dev/usbharu/hideout/routing/api/mastodon/v1/Statuses.kt
deleted file mode 100644
index ba757257..00000000
--- a/src/main/kotlin/dev/usbharu/hideout/routing/api/mastodon/v1/Statuses.kt
+++ /dev/null
@@ -1,18 +0,0 @@
-package dev.usbharu.hideout.routing.api.mastodon.v1
-
-// @Suppress("UnusedPrivateMember")
-// fun Route.statuses(postService: IPostService) {
-// //    route("/statuses") {
-// //        post {
-// //            val status: StatusForPost = call.receive()
-// //            val post = dev.usbharu.hideout.domain.model.hideout.form.Post(
-// //                userId = status.userId,
-// //                createdAt = System.currentTimeMillis(),
-// //                text = status.status,
-// //                visibility = 1
-// //            )
-// //            postService.create(post)
-// //            call.respond(status)
-// //        }
-// //    }
-// }
diff --git a/src/main/kotlin/dev/usbharu/hideout/routing/wellknown/WebfingerRouting.kt b/src/main/kotlin/dev/usbharu/hideout/routing/wellknown/WebfingerRouting.kt
deleted file mode 100644
index efa782c9..00000000
--- a/src/main/kotlin/dev/usbharu/hideout/routing/wellknown/WebfingerRouting.kt
+++ /dev/null
@@ -1,45 +0,0 @@
-package dev.usbharu.hideout.routing.wellknown
-
-import dev.usbharu.hideout.config.Config
-import dev.usbharu.hideout.domain.model.wellknown.WebFinger
-import dev.usbharu.hideout.exception.IllegalParameterException
-import dev.usbharu.hideout.exception.ParameterNotExistException
-import dev.usbharu.hideout.service.api.WebFingerApiService
-import dev.usbharu.hideout.util.HttpUtil.Activity
-import io.ktor.http.*
-import io.ktor.server.application.*
-import io.ktor.server.response.*
-import io.ktor.server.routing.*
-
-@Deprecated("Ktor is deprecated")
-fun Routing.webfinger(webFingerApiService: WebFingerApiService) {
-    route("/.well-known/webfinger") {
-        get {
-            val acct = call.request.queryParameters["resource"]?.decodeURLPart()
-                ?: throw ParameterNotExistException("Parameter(name='resource') does not exist.")
-
-            if (acct.startsWith("acct:").not()) {
-                throw IllegalParameterException("Parameter(name='resource') is not start with 'acct:'.")
-            }
-
-            val accountName = acct.substringBeforeLast("@")
-                .substringAfter("acct:")
-                .trimStart('@')
-
-            val userEntity = webFingerApiService.findByNameAndDomain(accountName, Config.configData.domain)
-
-            val webFinger = WebFinger(
-                subject = acct,
-                links = listOf(
-                    WebFinger.Link(
-                        rel = "self",
-                        type = ContentType.Application.Activity.toString(),
-                        href = "${Config.configData.url}/users/${userEntity.name}"
-                    )
-                )
-            )
-
-            return@get call.respond(webFinger)
-        }
-    }
-}