diff --git a/proto/mls/message_contents/group_metadata.proto b/proto/mls/message_contents/group_metadata.proto
index b41e7c7a..8f0dac82 100644
--- a/proto/mls/message_contents/group_metadata.proto
+++ b/proto/mls/message_contents/group_metadata.proto
@@ -24,8 +24,6 @@ enum ConversationType {
 message PolicySet {
   MembershipPolicy add_member_policy = 1;
   MembershipPolicy remove_member_policy = 2;
-  MembershipPolicy add_installation_policy = 3;
-  MembershipPolicy remove_installation_policy = 4;
 }
 
 // A policy that governs adding/removing members or installations