diff --git a/.devcontainer/backend/requirements.txt b/.devcontainer/backend/requirements.txt
index 2db3710a..78131981 100644
--- a/.devcontainer/backend/requirements.txt
+++ b/.devcontainer/backend/requirements.txt
@@ -24,6 +24,7 @@ ipykernel>=6.25,<7
 dotenv
 psycopg[binary]
 pytest-postgresql
+moto[s3,sqs]==5.0.28  # mock_aws (moto 5.x) for S3/SQS in orchestration tests
 # Formatting
 black==26.1.0
 boto3-stubs