diff --git a/backend/.env.example b/backend/.env.example
index 340b207b..e0150aa9 100644
--- a/backend/.env.example
+++ b/backend/.env.example
@@ -1,4 +1,4 @@
-APP_NAME=KIKIkan
+APP_NAME=KIKI
 APP_ENV=local
 APP_KEY=
 APP_DEBUG=true
diff --git a/backend/.env.release b/backend/.env.release
index 340b207b..e0150aa9 100644
--- a/backend/.env.release
+++ b/backend/.env.release
@@ -1,4 +1,4 @@
-APP_NAME=KIKIkan
+APP_NAME=KIKI
 APP_ENV=local
 APP_KEY=
 APP_DEBUG=true
diff --git a/backend/app/Http/Controllers/Controller.php b/backend/app/Http/Controllers/Controller.php
index 55059246..296cc4ae 100644
--- a/backend/app/Http/Controllers/Controller.php
+++ b/backend/app/Http/Controllers/Controller.php
@@ -43,7 +43,7 @@ class Controller extends BaseController
 
     public function imagesize ($value) {
         try {
-            return strlen($value) < 5242880; // 5 MiB（メビバイト） / 5.24288 MB（メガバイト）
+            return strlen($value) < 10485760; // 10 MiB（メビバイト） / 10.48576 MB（メガバイト）
         } catch (\Throwable $e) {
             Log::critical($e->getMessage());
             return false;
@@ -124,7 +124,7 @@ class Controller extends BaseController
         try {
             $ok = true;
             foreach (json_decode($value) as $v) {
-                if (strlen(base64_decode($v)) > 5242880) { // 5 MiB（メビバイト） / 5.24288 MB（メガバイト）
+                if (strlen(base64_decode($v)) > 10485760) { // 10 MiB（メビバイト） / 10.48576 MB（メガバイト）
                     $ok = false;
                 }
             }
diff --git a/backend/app/Mail/FathersRegistrationTemporaryMail.php b/backend/app/Mail/FathersRegistrationTemporaryMail.php
index 5a12c259..696c81a1 100644
--- a/backend/app/Mail/FathersRegistrationTemporaryMail.php
+++ b/backend/app/Mail/FathersRegistrationTemporaryMail.php
@@ -16,7 +16,7 @@ class FathersRegistrationTemporaryMail extends Mailable {
     }
 
     public function build () {
-        return $this->subject('【KIKIkan】会員登録のご案内')->markdown('emails.fathers.registration.temporary', [
+        return $this->subject('【KIKI】会員登録のご案内')->markdown('emails.fathers.registration.temporary', [
             'token' => $this->token
         ]);
     }
diff --git a/backend/resources/views/emails/fathers/registration/temporary.blade.php b/backend/resources/views/emails/fathers/registration/temporary.blade.php
index b0e98ede..4331452e 100644
--- a/backend/resources/views/emails/fathers/registration/temporary.blade.php
+++ b/backend/resources/views/emails/fathers/registration/temporary.blade.php
@@ -1,5 +1,5 @@
 @component('mail::message')
-# 【KIKIkan】会員登録のご案内
+# 【KIKI】会員登録のご案内
 
 KIKIサービスの会員登録のご案内です。