diff --git a/pyproject.toml b/pyproject.toml
index 4cb0cae2..4a6ad4da 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -70,6 +70,7 @@ dev = [
   "pytest>=8.0",
   "pytest-asyncio>=0.23",
   "ruff>=0.5",
+  "respx>=0.22",
 ]
 
 # === PyPI-clean: all available extras ===