diff --git a/requirements.txt b/requirements.txt
index 89be57b..b7623f3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,9 @@ docutils==0.18.1
 feedgenerator==2.0.0
 Jinja2==3.1.2
 Markdown==3.3.6
+markdown-it-py==2.2.0
 MarkupSafe==2.1.1
+mdurl==0.1.2
 pelican==4.7.2
 pelican-linkclass==2.0.2
 pelican-obsidian @ git+https://git.tannercollin.com/tanner/pelican-obsidian.git@41dd1d649127ae2833f5a4b1c3b6b6cb571117d8