diff --git a/ObsoleteFiles.inc b/ObsoleteFiles.inc
--- a/ObsoleteFiles.inc
+++ b/ObsoleteFiles.inc
@@ -51,6 +51,14 @@
 #   xargs -n1 | sort | uniq -d;
 # done
 
+# 20260119: remove obsolete MIT KRB5 plugin files
+OLD_LIBS+=usr/lib/krb5/plugins/kdb/db2.so.121
+OLD_LIBS+=usr/lib/krb5/plugins/preauth/otp.so.121
+OLD_LIBS+=usr/lib/krb5/plugins/preauth/pkinit.so.121
+OLD_LIBS+=usr/lib/krb5/plugins/preauth/spake.so.121
+OLD_LIBS+=usr/lib/krb5/plugins/preauth/test.so.121
+OLD_LIBS+=usr/lib/krb5/plugins/tls/k5tls.so.121
+
 # 20260114: remove ncurses html documentation
 OLD_FILES+=usr/share/doc/ncurses/hackguide.html
 OLD_FILES+=usr/share/doc/ncurses/ncurses-intro.html