Multi-Factor Authentication (MFA), Duo Version Update

A root certificate used by older Duo clients will expire on March 31. Duo Mobile and Duo-integrated applications must be updated to continue authenticating successfully.

If updates are not applied, users may experience:

  • Failed authentication attempts
  • Duo Push notifications not being delivered
  • Login disruptions for Duo-protected applications

Failure to update before the certificate expiration may result in authentication outages.

How to check your Duo Mobile version?

Step 1: Open the Duo Mobile App

Step 2: Tap the menu icon(≡) in the top-left corner

Step 3: Check the version number at the bottom of the screen. You will see something like (Version:4.103.0.1436.1)

Note:

Minimum required versions are Duo Mobile 4.85.0 or later

How to update the Duo Mobile?

This message appears because the older versions of Duo are no longer supported. Duo is updating a security certificate used by its clients, and updates are required to continue using Duo.

To Update:

Step1: Open the App Store (iOS) or Google Play store (Android)

Step 2: Search “Duo Mobile”

Step 3: Tap “Update”

Step 4: Reopen the app after successful update.

Note:

Supported mobile operating systems:

Android: Version 11 or later

iOS: Version 16 or later

Application Owners and System Administrators

    Applications and services that integrate with Duo using: Duo APIs, Duo SDKs, Duo Authentication Proxy, and Duo-developed integration must be updated to the versions that include the new CA Bundle.

    Refer to Duo’s documentation for details: https://help.duo.com/s/article/9451

    Need Help?

    If you experience issues after updating, send an email to consult@illinois.edu or call the Tech Services Help Desk.


    Keywords:
    MFA, 2FA Multi-factor Authentication, Duo, Duo Mobile, Duo CA bundle, Duo update 
    Doc ID:
    157771
    Owned by:
    Identity and Access Management G. in University of Illinois Technology Services
    Created:
    2026-01-07
    Updated:
    2026-01-22
    Sites:
    University of Illinois Technology Services