diff --git a/pyproject.toml b/pyproject.toml
index 9cf6150..96382ed 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -31,7 +31,7 @@ demo = [
 ]
 dev = [
   "fastapi>=0.115,<0.140",
-  "httpx2>=2,<3",
+  "httpx>=0.27,<1",
   "pydantic>=2.8,<3",
   "pytest>=8,<10",
   "ruff>=0.11,<1",