diff --git a/pyproject.toml b/pyproject.toml
index 9f0eabd1..bb6f456f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -36,6 +36,7 @@ dev = [
     "psutil>=5.9.0",
     "aiohttp>=3.9.0",
     "pytest-benchmark>=4.0.0",
+    "respx>=0.21",
     "routstr",
 ]
 
diff --git a/uv.lock b/uv.lock
index 6ca3e9ed..1da5b968 100644
--- a/uv.lock
+++ b/uv.lock
@@ -2584,6 +2584,18 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/d7/8e/7540e8a2036f79a125c1d2ebadf69ed7901608859186c856fa0388ef4197/requests-2.33.1-py3-none-any.whl", hash = "sha256:4e6d1ef462f3626a1f0a0a9c42dd93c63bad33f9f1c1937509b8c5c8718ab56a", size = 64947, upload-time = "2026-03-30T16:09:13.83Z" },
 ]
 
+[[package]]
+name = "respx"
+version = "0.23.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "httpx", extra = ["socks"] },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/43/98/4e55c9c486404ec12373708d015ebce157966965a5ebe7f28ff2c784d41b/respx-0.23.1.tar.gz", hash = "sha256:242dcc6ce6b5b9bf621f5870c82a63997e8e82bc7c947f9ffe272b8f3dd5a780", size = 29243, upload-time = "2026-04-08T14:37:16.008Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/1d/4a/221da6ca167db45693d8d26c7dc79ccfc978a440251bf6721c9aaf251ac0/respx-0.23.1-py2.py3-none-any.whl", hash = "sha256:b18004b029935384bccfa6d7d9d74b4ec9af73a081cc28600fffc0447f4b8c1a", size = 25557, upload-time = "2026-04-08T14:37:14.613Z" },
+]
+
 [[package]]
 name = "rich"
 version = "14.1.0"
@@ -2645,6 +2657,7 @@ dev = [
     { name = "pytest-asyncio" },
     { name = "pytest-benchmark" },
     { name = "pytest-cov" },
+    { name = "respx" },
     { name = "routstr" },
     { name = "ruff" },
 ]
@@ -2680,6 +2693,7 @@ dev = [
     { name = "pytest-asyncio", specifier = ">=0.24.0" },
     { name = "pytest-benchmark", specifier = ">=4.0.0" },
     { name = "pytest-cov", specifier = ">=6.1.1" },
+    { name = "respx", specifier = ">=0.21" },
     { name = "routstr", editable = "." },
     { name = "ruff", specifier = ">=0.11.6" },
 ]