diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/config/MessageSourceConfig.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/config/MessageSourceConfig.kt
index ecbc2553..dcfecd4b 100644
--- a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/config/MessageSourceConfig.kt
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/config/MessageSourceConfig.kt
@@ -22,7 +22,5 @@ class MessageSourceConfig {
     @Bean
     @Profile("dev")
     @ConfigurationProperties(prefix = "spring.messages")
-    fun messageSourceProperties(): MessageSourceProperties {
-        return MessageSourceProperties()
-    }
+    fun messageSourceProperties(): MessageSourceProperties = MessageSourceProperties()
 }
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/config/SecurityConfig.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/config/SecurityConfig.kt
index a9730eda..d0b071ca 100644
--- a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/config/SecurityConfig.kt
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/config/SecurityConfig.kt
@@ -140,6 +140,7 @@ class SecurityConfig {
     }
 
     @Bean
+    @Suppress("UnsafeCallOnNullableType")
     fun loadJwkSource(jwkConfig: JwkConfig, applicationConfig: ApplicationConfig): JWKSource<SecurityContext> {
         if (jwkConfig.keyId == null) {
             logger.error("hideout.security.jwt.keyId is null.")
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/userdetails/UserDetailHashedPassword.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/userdetails/UserDetailHashedPassword.kt
index 8e5edf56..2e73d911 100644
--- a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/userdetails/UserDetailHashedPassword.kt
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/userdetails/UserDetailHashedPassword.kt
@@ -18,7 +18,5 @@ package dev.usbharu.hideout.core.domain.model.userdetails
 
 @JvmInline
 value class UserDetailHashedPassword(val password: String) {
-    override fun toString(): String {
-        return "[MASKED]"
-    }
+    override fun toString(): String = "[MASKED]"
 }
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/userdetails/UserDetailId.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/userdetails/UserDetailId.kt
index 0641cd6e..23faa150 100644
--- a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/userdetails/UserDetailId.kt
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/userdetails/UserDetailId.kt
@@ -18,7 +18,5 @@ package dev.usbharu.hideout.core.domain.model.userdetails
 
 @JvmInline
 value class UserDetailId(val id: Long) {
-    override fun toString(): String {
-        return "UserDetailId(id=$id)"
-    }
+    override fun toString(): String = "UserDetailId(id=$id)"
 }
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedquery/ExposedUserTimelineQueryService.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedquery/ExposedUserTimelineQueryService.kt
index 72e48686..82be6f96 100644
--- a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedquery/ExposedUserTimelineQueryService.kt
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedquery/ExposedUserTimelineQueryService.kt
@@ -17,6 +17,9 @@ import java.net.URI
 @Repository
 class ExposedUserTimelineQueryService : UserTimelineQueryService, AbstractRepository() {
 
+    override val logger: Logger
+        get() = Companion.logger
+
     protected fun authorizedQuery(principal: Principal? = null): QueryAlias {
         if (principal == null) {
             return Posts
@@ -73,8 +76,8 @@ class ExposedUserTimelineQueryService : UserTimelineQueryService, AbstractReposi
 
     private fun toPostDetail(it: ResultRow, authorizedQuery: QueryAlias, iconMedia: Alias<Media>): PostDetail {
         return PostDetail(
-            it[authorizedQuery[Posts.id]],
-            ActorDetail(
+            id = it[authorizedQuery[Posts.id]],
+            actor = ActorDetail(
                 actorId = it[authorizedQuery[Posts.actorId]],
                 instanceId = it[Actors.instance],
                 name = it[Actors.name],
@@ -101,9 +104,6 @@ class ExposedUserTimelineQueryService : UserTimelineQueryService, AbstractReposi
         )
     }
 
-    override val logger: Logger
-        get() = Companion.logger
-
     companion object {
         private val logger = LoggerFactory.getLogger(ExposedUserTimelineQueryService::class.java)
     }
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/interfaces/web/auth/AuthController.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/interfaces/web/auth/AuthController.kt
index 7e985359..ccda2fab 100644
--- a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/interfaces/web/auth/AuthController.kt
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/interfaces/web/auth/AuthController.kt
@@ -60,7 +60,6 @@ class AuthController(
     }
 
     @GetMapping("/auth/sign_out")
-    fun signOut(): String {
-        return "sign_out"
-    }
+    @Suppress("FunctionOnlyReturningConstant")
+    fun signOut(): String = "sign_out"
 }
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/interfaces/web/posts/PublishPost.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/interfaces/web/posts/PublishPost.kt
index 334f1b1b..5da5aa30 100644
--- a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/interfaces/web/posts/PublishPost.kt
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/interfaces/web/posts/PublishPost.kt
@@ -1,5 +1,6 @@
 package dev.usbharu.hideout.core.interfaces.web.posts
 
+@Suppress("ConstructorParameterNaming")
 data class PublishPost(
     var status: String? = null,
     var overview: String? = null,
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/util/RsaUtil.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/util/RsaUtil.kt
index 4af71576..8f9d0bfd 100644
--- a/hideout-core/src/main/kotlin/dev/usbharu/hideout/util/RsaUtil.kt
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/util/RsaUtil.kt
@@ -45,11 +45,7 @@ object RsaUtil {
 
     fun decodeRsaPrivateKey(encoded: String): RSAPrivateKey = decodeRsaPrivateKey(Base64Util.decode(encoded))
 
-    fun encodeRsaPublicKey(publicKey: RSAPublicKey): String {
-        return Base64Util.encode(publicKey.encoded)
-    }
+    fun encodeRsaPublicKey(publicKey: RSAPublicKey): String = Base64Util.encode(publicKey.encoded)
 
-    fun encodeRsaPrivateKey(privateKey: RSAPrivateKey): String {
-        return Base64Util.encode(privateKey.encoded)
-    }
+    fun encodeRsaPrivateKey(privateKey: RSAPrivateKey): String = Base64Util.encode(privateKey.encoded)
 }