heroku-20

Heroku-20 stack based on Ubuntu 20.04 - END OF LIFE
Platform:

⚠️ End of Life Notice

Heroku-20 reached end of life on April 30, 2025.

Overview

Heroku-20 was based on Ubuntu 20.04 LTS.

Support Timeline

  • Release: 2020
  • Deprecated: June 2024
  • End of Life: April 30, 2025
  • Build Cutoff: Approximately May 30, 2025

Post-EOL Status

  • Existing apps continue to run at customer’s own risk
  • No security updates provided
  • No new builds/deployments allowed after build cutoff
  • Limited technical support available

Required Action

All applications on Heroku-20 must be upgraded to Heroku-22 or Heroku-24 immediately.

Running applications on an end-of-life stack exposes them to security vulnerabilities and compliance risks.

Migration Path

  1. Test application on Heroku-24 (recommended) or Heroku-22
  2. Update dependencies and configurations as needed
  3. Deploy to new stack
  4. Monitor for any runtime issues

References

Last modified December 19, 2025: Clean up blank lines in flux-epa-learner-docker.md (0701120)