diff --git a/pyproject.toml b/pyproject.toml
index 9b4c02e..367226c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -51,7 +51,7 @@ pydantic-settings = "^2.3"
 pytest = "^8.3.2"
 pytest-asyncio = "^0.24.0"
 pytest-cov = "^5.0.0"
-httpx = "^0.27.0"
+httpx = ">=0.27,<0.29"
 aiosqlite = "^0.20.0"
 greenlet = "^3.0.3"
 alembic = "^1.13.2"