diff --git a/pyproject.toml b/pyproject.toml
index 0c9cd8d4..f4aa0f8c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,7 +10,7 @@ readme = "README.md"
 requires-python = ">=3.11, <3.13"
 dependencies = [
     # 3.4.5 requires Starlette >=1 through its client extra; MinerU/Gradio need <1.
-    "fastmcp>=3.3.1,<3.4.5",
+    "fastmcp>=4.0.3,<4.0.4",
     "mcp",
     "rich",
     "pandas",