diff --git a/samples/python/hosts/a2a_gui/pyproject.toml b/samples/python/hosts/a2a_gui/pyproject.toml
index 866f354ed..a0579d239 100644
--- a/samples/python/hosts/a2a_gui/pyproject.toml
+++ b/samples/python/hosts/a2a_gui/pyproject.toml
@@ -16,6 +16,7 @@ dependencies = [
     "pyjwt>=2.10.1",
     "typing-extensions>=4.12.2",
     "uvicorn>=0.34.0",
+    "fastapi>=0.123.4",
     "Pillow>=10.0.0",
 ]