diff --git a/pyproject.toml b/pyproject.toml
index 8b787e8d93..d897495ca7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -67,7 +67,7 @@ dependencies = [
   "kombu==5.2.*",
   "libsass==0.22.*",
   "lxml",
-  "markdown==3.3.4",  # 3.3.5 requires importlib-metadata>=4.4, but django-bootstrap3 requires importlib-metadata<3.
+  "markdown==3.4.3",  # 3.3.5 requires importlib-metadata>=4.4, but django-bootstrap3 requires importlib-metadata<3.
   # We can upgrade markdown again once django-bootstrap3 upgrades or once we drop Python 3.6 and 3.7
   "mt-940==4.23.*",
   "oauthlib==3.2.*",