diff --git a/pyproject.toml b/pyproject.toml
index 53351074..c51d49ac 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,7 +19,7 @@ classifiers = [
 ]
 dependencies = [
     "mcp>=1.30.0,<2",
-    "fastmcp>=3.4.7,<4",
+    "fastmcp>=4.0.3,<5",
     "tree-sitter>=0.26.0,<1",
     "tree-sitter-language-pack>=1.16.2,<2",
     "networkx>=3.6.1,<4",