diff --git a/backend/services/admin-service/src/api/controllers/version.controller.ts b/backend/services/admin-service/src/api/controllers/version.controller.ts
index f79bdb93..45327daf 100644
--- a/backend/services/admin-service/src/api/controllers/version.controller.ts
+++ b/backend/services/admin-service/src/api/controllers/version.controller.ts
@@ -335,6 +335,9 @@ export class VersionController {
     file: Express.Multer.File,
     @Body() dto: UploadVersionDto,
   ): Promise<VersionDto> {
+    // Debug: log isForceUpdate value
+    console.log('[VersionController] uploadVersion - dto.isForceUpdate:', dto.isForceUpdate, 'type:', typeof dto.isForceUpdate)
+
     // Validate file extension
     const ext = file.originalname.toLowerCase().split('.').pop()
     if (dto.platform === Platform.ANDROID && ext !== 'apk') {
diff --git a/backend/services/admin-service/src/api/dto/request/upload-version.dto.ts b/backend/services/admin-service/src/api/dto/request/upload-version.dto.ts
index d64d71f9..d2918381 100644
--- a/backend/services/admin-service/src/api/dto/request/upload-version.dto.ts
+++ b/backend/services/admin-service/src/api/dto/request/upload-version.dto.ts
@@ -34,7 +34,13 @@ export class UploadVersionDto {
 
   @ApiPropertyOptional({ description: '是否强制更新', default: false })
   @IsOptional()
-  @Transform(({ value }) => value === 'true' || value === true)
+  @Transform(({ value }) => {
+    // Handle string "true"/"false" from FormData
+    if (typeof value === 'string') {
+      return value.toLowerCase() === 'true'
+    }
+    return value === true
+  })
   @IsBoolean()
   isForceUpdate?: boolean