Notice: This article may contain information for multiple versions of Passpack, be sure and read the section appropriate to your version. How do I know what version I'm using?
Not automatically, sorry.
Passpack can securely store passwords for you, it can suggest strong passwords for you, and it can even log you into websites - the one thing it can't do is automatically change your passwords for you on other websites.
Passpack v8 (Preview)