diff --git a/requirements.txt b/requirements.txt
index 97b904590..db09535b9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,8 @@
 uvicorn==0.39.0; python_version == '3.9'  # version 0.39.0 is the last version supporting Python 3.9
 uvicorn==0.41.0; python_version >= '3.10'
 pydantic==2.12.5
-fastapi==0.131.0
+fastapi==0.128.8; python_version == '3.9'  # version 0.128.8 is the last version supporting Python 3.9
+fastapi==0.131.0; python_version >= '3.10'
 python-multipart==0.0.20; python_version == '3.9'  # version 0.0.20 is the last to support Python 3.9
 python-multipart==0.0.22; python_version >= '3.10'
 websockets==15.0.1; python_version == '3.9'  # version 15.0.1 is the last to support Python 3.9