diff --git a/pyproject.toml b/pyproject.toml
index b229b17..034d6c5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -49,7 +49,7 @@ asgi-lifespan = "~1.0.1"
 requests = "~2.31.0"
 respx = "~0.19.2"
 
-markdown = "3.3.6"  # https://github.com/python-poetry/poetry/issues/4777
+markdown = "3.9"  # https://github.com/python-poetry/poetry/issues/4777
 
 [build-system]
 requires = ["poetry>=1.1.12"]