diff --git a/common/extra/requirements.txt b/common/extra/requirements.txt
index e1e72ae..7f79072 100644
--- a/common/extra/requirements.txt
+++ b/common/extra/requirements.txt
@@ -6,3 +6,4 @@
 #
 
 pandoc-latex-environment==1.1.*
+pandocfilters==1.5.*