diff --git a/pyproject.toml b/pyproject.toml
index 20c3176..43d001a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -30,6 +30,7 @@ api = [
 reports = [
     "jinja2>=3.1",
     "weasyprint>=60.0",
+    "matplotlib>=3.8",
 ]
 dev = [
     "pytest>=7.0",