diff --git a/pyproject.toml b/pyproject.toml
index fade424..15b82fb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,7 +12,7 @@ packages = [
 
 [tool.poetry.dependencies]
 python = "^3.10"
-fastapi = "^0.104.1"
+fastapi = ">=0.104.1,<0.140.0"
 uvicorn = {extras = ["standard"], version = "^0.24.0"}
 pydantic = "^2.5.0"
 pydantic-settings = "^2.1.0"