diff --git a/tox.ini b/tox.ini
index fcab3ad1ed..c11a133a37 100644
--- a/tox.ini
+++ b/tox.ini
@@ -629,7 +629,7 @@ deps =
     starlette: pytest-asyncio
     starlette: python-multipart
     starlette: requests
-    starlette: httpx
+    starlette: httpx<0.27.1
     # (this is a dependency of httpx)
     starlette: anyio<4.0.0
     starlette: jinja2