diff --git a/backend/pyproject.toml b/backend/pyproject.toml
index 30e5437b..2d7e04c0 100644
--- a/backend/pyproject.toml
+++ b/backend/pyproject.toml
@@ -9,7 +9,7 @@ dependencies = [
     "uvicorn[standard]>=0.34.0",
     "httpx>=0.28.0",
     "urllib3>=2.5.0",
-    "sse-starlette>=2.2.0",
+    "sse-starlette>=3.4.6",
     "pydantic>=2.10.0",
     "pydantic-settings>=2.7.0",
     "aiosqlite>=0.20.0",