diff --git a/CHANGELOG.md b/CHANGELOG.md
index 08d8937f56..dbee019649 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -24,6 +24,7 @@
 - Enhance: センシティブメディアの判定を外部サービス ([sensitive-detector](https://github.com/misskey-dev/sensitive-detector)) に分離し、`nsfwjs` / `@tensorflow/tfjs(-node)` の同梱と NSFW 判定モデルを廃止 (#16804)
 - Enhance: Node.js 22.23.0以降、24.17.0以降、26.4.0以降をサポートするように
 - Enhance: Docker Image の Node.js を 26.4.0 に、Debian を trixie (v13) に更新
+- Fix: `/stats` API のレスポンス型が正しくない問題を修正
 
 ## 2026.6.0
 
diff --git a/packages/backend/src/server/api/endpoints/stats.ts b/packages/backend/src/server/api/endpoints/stats.ts
index 1e6983177f..548bcdbb04 100644
--- a/packages/backend/src/server/api/endpoints/stats.ts
+++ b/packages/backend/src/server/api/endpoints/stats.ts
@@ -35,6 +35,14 @@ export const meta = {
 				type: 'number',
 				optional: false, nullable: false,
 			},
+			reactionsCount: {
+				type: 'number',
+				optional: false, nullable: false,
+			},
+			//originalReactionsCount: {
+			//	type: 'number',
+			//	optional: false, nullable: false,
+			//},
 			instances: {
 				type: 'number',
 				optional: false, nullable: false,
diff --git a/packages/misskey-js/src/autogen/types.ts b/packages/misskey-js/src/autogen/types.ts
index 85767b355e..efb20fd43c 100644
--- a/packages/misskey-js/src/autogen/types.ts
+++ b/packages/misskey-js/src/autogen/types.ts
@@ -34287,6 +34287,7 @@ export interface operations {
                         originalNotesCount: number;
                         usersCount: number;
                         originalUsersCount: number;
+                        reactionsCount: number;
                         instances: number;
                         driveUsageLocal: number;
                         driveUsageRemote: number;