diff --git a/pyproject.toml b/pyproject.toml
index b7c904c..2cb6e0a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,7 +13,7 @@ readme = "README.md"
 requires-python = ">=3.13"
 dependencies = [
     "e2b>=2.13.2",
-    "mcp>=1.26.0",
+    "mcp>=1.26.0,<2",
     "modal>=1.3.2",
 ]
 
diff --git a/uv.lock b/uv.lock
index dbdb1b6..dcec4c2 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1,5 +1,5 @@
 version = 1
-revision = 2
+revision = 3
 requires-python = ">=3.13"
 resolution-markers = [
     "python_full_version >= '3.14'",
@@ -683,7 +683,7 @@ dev = [
 requires-dist = [
     { name = "e2b", specifier = ">=2.13.2" },
     { name = "kilntainers", extras = ["wasm"], marker = "extra == 'all'" },
-    { name = "mcp", specifier = ">=1.26.0" },
+    { name = "mcp", specifier = ">=1.26.0,<2" },
     { name = "modal", specifier = ">=1.3.2" },
     { name = "wasmtime", marker = "extra == 'wasm'", specifier = ">=41.0.0" },
 ]