opasswd not update

hi. everyone.

i set common-password
Quote:

password[success=1 default=ignore]pam_unix.so obscure sha512 remember=5

i change local user password use passwd command.
i find old password list in /etc/security/opasswd

Quote:

$ sudo cat /etc/security/opasswd test:1001:3:$1$yQw9PhwD$LqytlUASvFueam5tScGX0/,$1$yBoPDiGO$H.HIozf2bRWlSscVe0U1M0,$1$Akzyo7eY$PeO.6NPjsUbKkPku5YtAJ0

i change passwd local user through sudo command. but not update opasswd file.
Quote:

$ sudo passwd test Enter new UNIX password: Retype new UNIX password: passwd: password updated successfully test@ip-172-31-14-14:~$ sudo cat /etc/security/opasswd test:1001:3:$1$yQw9PhwD$LqytlUASvFueam5tScGX0/,$1$yBoPDiGO$H.HIozf2bRWlSscVe0U1M0,$1$Akzyo7eY$PeO.6NPjsUbKkPku5YtAJ0

why not update opasswd file???