diff --git a/pyproject.toml b/pyproject.toml
index b093ec4..b14fb3e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,6 +18,7 @@ colorcet = "*"
 matplotlib = "*"
 parfor = ">=2024.3.0"
 pytest = { version = "*", optional = true }
+mypy = { version = "*", optional = true }
 
 [tool.poetry.extras]
 test = ["pytest", "mypy"]