diff --git a/requirements.txt b/requirements.txt
index 40759400..5c41018a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,6 +6,9 @@ pycparser==2.21
 pygit2==1.9.2
 python-frontmatter==1.0.0
 PyYAML==5.4
+python-dateutil==2.8.2
+python-liquid==1.2.1
 six==1.16.0
 soupsieve==2.3.2.post1
+typing_extensions==4.3.0
 webencodings==0.5.1