diff --git a/feedgen/entry.py b/feedgen/entry.py
index 66400ba..ba67192 100644
--- a/feedgen/entry.py
+++ b/feedgen/entry.py
@@ -446,8 +446,7 @@ def link(self, link=None, replace=False, **kwargs):
                 link,
                 set(['href', 'rel', 'type', 'hreflang', 'title', 'length']),
                 set(['href']),
-                {'rel': ['alternate', 'enclosure', 'related', 'self', 'via']},
-                {'rel': 'alternate'})
+                defaults={'rel': 'alternate'})
             # RSS only needs one URL. We use the first link for RSS:
             for l in self.__atom_link:
                 if l.get('rel') == 'alternate':
diff --git a/requirements.txt b/requirements.txt
index 3c01ee4..e0715c5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,2 @@
-lxml==4.2.5
+lxml==6.0.0
 python_dateutil==2.8.0