diff --git a/pyproject.toml b/pyproject.toml
index dcff9c2..075f638 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,7 +19,7 @@ dependencies = [
 [project.optional-dependencies]
 dev = [
     "pytest", "flake8", "mypy",
-    "lxml", "types-lxml",
+    "lxml", "types-lxml", "types-Markdown", "pandas-stubs",
     "requests",
     "matplotlib>=3.1.1",
     "pandas>=2.0.0", "Jinja2",