diff --git a/pyproject.toml b/pyproject.toml
index 9590e40..b1ae1fd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,7 +26,7 @@ dependencies = [
     "sse-starlette >= 2.2.0",
     "packaging",
     "tokenizers >= 0.21.0",
-    "formatron >= 0.4.10",
+    "formatron >= 0.4.11",
     "kbnf >= 0.4.1",
     "aiofiles",
     "aiohttp",