diff --git a/CHANGELOG.md b/CHANGELOG.md
index eb9ad1c100..50cfc746bf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,14 @@
 You should also include the user name that made the change.
 -->
 
+## 13.x.x (unreleased)
+
+### Improvements
+- 
+
+### Bugfixes
+- fix(server): メールアドレス更新時にバリデーションが正しく行われていないのを修正
+
 ## 13.8.1 (2023/02/26)
 
 ### Bugfixes
diff --git a/packages/backend/src/server/api/endpoints/i/update-email.ts b/packages/backend/src/server/api/endpoints/i/update-email.ts
index b656c5c51d..4f543a6472 100644
--- a/packages/backend/src/server/api/endpoints/i/update-email.ts
+++ b/packages/backend/src/server/api/endpoints/i/update-email.ts
@@ -73,8 +73,8 @@ export default class extends Endpoint<typeof meta, typeof paramDef> {
 			}
 
 			if (ps.email != null) {
-				const available = await this.emailService.validateEmailForAccount(ps.email);
-				if (!available) {
+				const res = await this.emailService.validateEmailForAccount(ps.email);
+				if (!res.available) {
 					throw new ApiError(meta.errors.unavailable);
 				}
 			}