---
title: "TeamCity 2026.2.1 and 2026.1.5 Are Out"
description: "JetBrains has released TeamCity 2026.2.1 and 2026.1.5, two bug-fix updates for the On-Premises versions of TeamCity that address more than 40 security vulnerabilities combined. These updates also resolve specific regressions including TFS projects failing to display diffs, YAML configuration import issues from a main repository branch, and MSBuild tools not being detected after the Visual Studio Build Tools 2026 September update. In addition to the numerous security fixes, these releases deliver performance improvements, better compatibility with integrations, and faster, more stable builds for users. A key compatibility feature allows upgrades or downgrades within the same major version without requiring backup restoration because bug-fix releases share a common data format. Users can upgrade via automatic update within TeamCity, direct download from the JetBrains website, or by pulling the updated Docker image from Docker Hub."
---

# TeamCity 2026.2.1 and 2026.1.5 Are Out

[Jetbrains](https://yomu.fyi/company/jetbrains) · Dmitrii Korovin · Oct 5, 2026

**Type:** Announcement

## Summary

JetBrains has released TeamCity 2026.2.1 and 2026.1.5, two bug-fix updates for the On-Premises versions of TeamCity that address more than 40 security vulnerabilities combined. These updates also resolve specific regressions including TFS projects failing to display diffs, YAML configuration import issues from a main repository branch, and MSBuild tools not being detected after the Visual Studio Build Tools 2026 September update. In addition to the numerous security fixes, these releases deliver performance improvements, better compatibility with integrations, and faster, more stable builds for users. A key compatibility feature allows upgrades or downgrades within the same major version without requiring backup restoration because bug-fix releases share a common data format. Users can upgrade via automatic update within TeamCity, direct download from the JetBrains website, or by pulling the updated Docker image from Docker Hub.

## Context

TeamCity On-Premises 2026.1 and 2026.2 series receive these updates to address over 40 security vulnerabilities and resolve user-reported regressions in TFS diff display, YAML configuration import, and MSBuild detection.

## Takeaways

- TeamCity 2026.2.1 and 2026.1.5 patch more than 40 security vulnerabilities combined, making the upgrade strongly recommended.
- The updates fix regressions such as TFS diff display failures, YAML config import from the main repository branch, and MSBuild detection after the Visual Studio Build Tools 2026 September update.
- All bug-fix updates within the same major version share a data format, so upgrading or downgrading does not require backup and restoration.

## FAQ

### How do I upgrade to the latest TeamCity bug-fix release?

You can upgrade via the automatic update feature in your current TeamCity version, download directly from the JetBrains website, or pull the updated TeamCity Docker image.

### Why should I upgrade to these versions?

These updates patch over 40 security vulnerabilities and fix several bugs, improving security and stability. JetBrains strongly recommends upgrading as soon as possible.

### Do I need to backup data before upgrading?

No. All bug-fix updates within the same major version share a data format, allowing upgrade or downgrade without backup and restoration.

**Tags:** [Security](https://yomu.fyi/topic/security), [TeamCity](https://yomu.fyi/topic/teamcity)

- Source: [Jetbrains](https://blog.jetbrains.com/teamcity/2026/10/teamcity-2026-2-1-2026-1-5-bugfix)
- Source URL: https://blog.jetbrains.com/teamcity/2026/10/teamcity-2026-2-1-2026-1-5-bugfix
- Ingested by Yomu: 2026-10-05T15:00:08.838Z

[Read original post](https://blog.jetbrains.com/teamcity/2026/10/teamcity-2026-2-1-2026-1-5-bugfix)