Duo Mobile Client upgrade required by February 2, 2026

Overview

To maintain the highest level of security and compatibility, Duo periodically updates its mobile application. Starting February 2, 2026, Duo will no longer support versions of the Duo Mobile app prior to version 4.85.0 because they lack current encryption certificates. Users running outdated versions must upgrade to the latest release to continue using Duo for multi-factor authentication (MFA). Failure to update may result in authentication issues, including not receiving push notifications, and inability to access protected resources except by entering a code from the application. 

• Communication
  • Duo Sign-In Notification
  • Email Communication
• What You Need To Do
• Why This Upgrade Is Important
• Additional Resources

Communication

Duo Sign-In Notification

During the sign-in process, if you are using a version prior to 4.85.0, you will see an "Update Recommended" dialog. It will look similar to this:

Email Communication

Users who have used a mobile device in the past 30 days, which have been identified as using a version prior to 4.85.0, will receive an email communication recommending they upgrade the client software. This may require updating your phone operating system.

What You Need to Do

If you see this warning, check your device for the current version of Duo Mobile. If your app is outdated, visit the Apple App Store (for iOS devices) or Google Play Store (for Android devices) and download the latest version. Ensure your device meets the minimum OS requirements: iOS 14 or later and Android 10 or later. If your device cannot support these versions, you may need to upgrade your device to continue using Duo.

Why This Upgrade Is Important

Upgrading ensures that you benefit from the latest security enhancements, bug fixes, and improved user experience. Older versions may lack critical security patches, leaving your account vulnerable. Duo’s updated app also includes performance improvements and compatibility with newer operating systems, ensuring a seamless MFA process.

Additional Resources

For detailed technical information on this important update, visit https://help.duo.com/s/article/9451. If you encounter issues during the upgrade, contact your IT support team for assistance. Keeping your Duo Mobile app up to date is essential for secure and uninterrupted access to your accounts.