diff --git a/backend/build.gradle b/backend/build.gradle
index 73a8d92e..e0d80ae9 100644
--- a/backend/build.gradle
+++ b/backend/build.gradle
@@ -124,7 +124,7 @@ dependencies {
     implementation 'com.google.cloud:spring-cloud-gcp-starter-storage'
 
     // AWS SDK for S3 (Cloudflare R2 互換)
-    implementation platform('software.amazon.awssdk:bom:2.45.1')
+    implementation platform('software.amazon.awssdk:bom:2.46.1')
     implementation 'software.amazon.awssdk:s3'
     
     annotationProcessor 'org.springframework.boot:spring-boot-configuration-processor'