diff --git a/pyproject.toml b/pyproject.toml
index cfdf720..6fb0695 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,6 +15,7 @@ license = {text = "MIT"}
 dependencies = [
   "ruff>=0.1.0, <0.2.0",
   "python-lsp-server",
+	"cattrs!=23.2.1",
   "lsprotocol>=2022.0.0a1",
   "tomli>=1.1.0; python_version < '3.11'",
 ]