diff --git a/pyproject.toml b/pyproject.toml
index e6d3316..79105e5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,7 +40,8 @@ dev = [
     "sphinx-autodoc-typehints",
     "sphinx-click",
     "myst-parser",
-    "plotly"
+    "plotly",
+    "matplotlib"
     ]
 
 [tool.setuptools.packages]