diff --git a/backend/pyproject.toml b/backend/pyproject.toml
index 200d8a4..2c7af37 100644
--- a/backend/pyproject.toml
+++ b/backend/pyproject.toml
@@ -47,6 +47,7 @@ pyflakes = "^3.0.1"
 yapf = "^0.32.0"
 whatthepatch = "^1.0.4"
 mypy = "^1.0.0"
+types-sqlalchemy-utils = "^1.0.1"
 
 [tool.mypy]
 plugins = "sqlalchemy.ext.mypy.plugin"