diff --git a/requirements.txt b/requirements.txt
index b795bbdbe8b..d7c0d452e80 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,7 +14,7 @@ lxml==4.6.3
 Pillow==8.2.0
 psycopg2==2.8.6
 Pygments==2.8.1
-pymarc==4.1.0
+pymarc==4.2.1
 python-dateutil==2.8.1
 python-memcached==1.59
 PyYAML==5.4.1