diff --git a/pyproject.toml b/pyproject.toml
index 93d4827..2811119 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,7 +10,7 @@ authors = [
 requires-python = ">=3.10"
 dependencies = [
     "httpx",
-    "mcp>=1.0",
+    "mcp>=1.0,<2",
     "pyyaml",
 ]
 
diff --git a/uv.lock b/uv.lock
index 3c2a985..f226e61 100644
--- a/uv.lock
+++ b/uv.lock
@@ -309,7 +309,7 @@ name = "exceptiongroup"
 version = "1.3.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
+    { name = "typing-extensions" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/50/79/66800aadf48771f6b62f7eb014e352e5d06856655206165d775e675a02c9/exceptiongroup-1.3.1.tar.gz", hash = "sha256:8b412432c6055b0b7d14c310000ae93352ed6754f70fa8f7c34141f91c4e3219", size = 30371, upload-time = "2025-11-21T23:01:54.787Z" }
 wheels = [
@@ -452,7 +452,7 @@ test = [
 [package.metadata]
 requires-dist = [
     { name = "httpx" },
-    { name = "mcp", specifier = ">=1.0" },
+    { name = "mcp", specifier = ">=1.0,<2" },
     { name = "pytest", marker = "extra == 'test'" },
     { name = "pytest-asyncio", marker = "extra == 'test'" },
     { name = "pyyaml" },