diff --git a/pyproject.toml b/pyproject.toml
index 79d8648..2983987 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -43,7 +43,7 @@ dependencies = [
     # older version that still satisfies Flow's transitive requirement.
     "cryptography>=50.0.0",
     # Official Model Context Protocol SDK (stdio server transport).
-    "mcp>=1.28,<2",
+    "mcp>=1.28,<3",
     # Structured concurrency runtime the mcp SDK already uses; we call
     # anyio.run / to_thread directly.
     "anyio>=4.0",