diff --git a/requirements-dev.txt b/requirements-dev.txt
index 5f4e463..b0d9dc4 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -4,5 +4,6 @@ pytest-cov
 pytest-order
 pytest-retry
 pytest-asyncio
+httpx<0.28.0
 pytest-httpx
 grpcio-tools==1.40.0