diff --git a/README.md b/README.md
index ab3721b..313f74c 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,7 @@ feat(lambda): multiple lambda handlers in one repo
 - [x] sync-ga4-data
 - [x] archive-user
 - [x] daily-summary-email
+- [x] notification
 
 ## Dependencies
 
diff --git a/lib/notification/index.ts b/lib/notification/index.ts
index e4e5e99..c7fc0a8 100644
--- a/lib/notification/index.ts
+++ b/lib/notification/index.ts
@@ -45,7 +45,7 @@ export class NotificationService {
 
   public constructor({ knexRO, knex }: { knexRO: Knex; knex: Knex }) {
     this.knexRO = knexRO
-    this.knex = knex ?? knexRO
+    this.knex = knex
   }
 
   /**