diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Delete.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Delete.kt
index f2142722..6f691492 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Delete.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Delete.kt
@@ -43,8 +43,8 @@ open class Delete : Object, HasId, HasActor {
 
     override fun hashCode(): Int {
         var result = super.hashCode()
-        result = 31 * result + (apObject?.hashCode() ?: 0)
-        result = 31 * result + (published?.hashCode() ?: 0)
+        result = 31 * result + apObject.hashCode()
+        result = 31 * result + published.hashCode()
         result = 31 * result + actor.hashCode()
         result = 31 * result + id.hashCode()
         return result
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Undo.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Undo.kt
index d02ccc4d..01dbc17c 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Undo.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Undo.kt
@@ -30,14 +30,13 @@ open class Undo(
 
     override fun hashCode(): Int {
         var result = super.hashCode()
-        result = 31 * result + (`object`?.hashCode() ?: 0)
-        result = 31 * result + (published?.hashCode() ?: 0)
+        result = 31 * result + `object`.hashCode()
+        result = 31 * result + published.hashCode()
         result = 31 * result + actor.hashCode()
         result = 31 * result + id.hashCode()
         return result
     }
 
-    override fun toString(): String {
-        return "Undo(`object`=$`object`, published=$published, actor='$actor', id='$id') ${super.toString()}"
-    }
+    override fun toString(): String =
+        "Undo(`object`=$`object`, published=$published, actor='$actor', id='$id') ${super.toString()}"
 }
diff --git a/src/main/kotlin/dev/usbharu/hideout/application/config/SecurityConfig.kt b/src/main/kotlin/dev/usbharu/hideout/application/config/SecurityConfig.kt
index 499e68dd..9801c6da 100644
--- a/src/main/kotlin/dev/usbharu/hideout/application/config/SecurityConfig.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/application/config/SecurityConfig.kt
@@ -6,7 +6,6 @@ import com.nimbusds.jose.jwk.RSAKey
 import com.nimbusds.jose.jwk.source.ImmutableJWKSet
 import com.nimbusds.jose.jwk.source.JWKSource
 import com.nimbusds.jose.proc.SecurityContext
-import dev.usbharu.hideout.activitypub.service.objects.user.APUserService
 import dev.usbharu.hideout.application.external.Transaction
 import dev.usbharu.hideout.core.infrastructure.springframework.httpsignature.HttpSignatureFilter
 import dev.usbharu.hideout.core.infrastructure.springframework.httpsignature.HttpSignatureUserDetailsService
@@ -116,9 +115,6 @@ class SecurityConfig {
     @Bean
     fun getHttpSignatureFilter(
         authenticationManager: AuthenticationManager,
-        transaction: Transaction,
-        apUserService: APUserService,
-        userQueryService: UserQueryService
     ): HttpSignatureFilter {
         val httpSignatureFilter =
             HttpSignatureFilter(DefaultSignatureHeaderParser())
diff --git a/src/main/kotlin/dev/usbharu/hideout/core/domain/model/instance/Nodeinfo2_0.kt b/src/main/kotlin/dev/usbharu/hideout/core/domain/model/instance/Nodeinfo2_0.kt
index 98247150..97478228 100644
--- a/src/main/kotlin/dev/usbharu/hideout/core/domain/model/instance/Nodeinfo2_0.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/core/domain/model/instance/Nodeinfo2_0.kt
@@ -3,17 +3,17 @@
 package dev.usbharu.hideout.core.domain.model.instance
 
 @Suppress("ClassNaming")
-class Nodeinfo2_0() {
+class Nodeinfo2_0 {
     var metadata: Metadata? = null
     var software: Software? = null
 }
 
-class Metadata() {
+class Metadata {
     var nodeName: String? = null
     var nodeDescription: String? = null
 }
 
-class Software() {
+class Software {
     var name: String? = null
     var version: String? = null
 }