diff --git a/pyproject.toml b/pyproject.toml
index abddcd89..d93fdde4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -64,6 +64,7 @@ api = [
     "ascii_colors",
     "asyncpg",
     "distro",
+    "docling>=2.58.0,<3.0.0",
     "fastapi",
     "httpcore",
     "httpx",