diff --git a/pyproject.toml b/pyproject.toml
index 62ec9d9..f822866 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -33,7 +33,7 @@ dependencies = [
 version = { attr = "funlib.persistence.__version__" }
 
 [project.optional-dependencies]
-dev = ['coverage>=5.0.3', 'pytest', 'black', 'mypy', 'types-psycopg2']
+dev = ['coverage>=5.0.3', 'pytest', 'black', 'mypy', 'types-psycopg2', 'types-toml']
 
 [tool.ruff]
 # pyflakes, pycodestyle, isort