Hotfix
An urgent patch or update deployed to fix critical bugs or security vulnerabilities in production software without following the normal release cycle.
What is Hotfix?
What is Hotfix?
A hotfix is a rapid, out-of-cycle update applied to resolve critical bugs, security vulnerabilities, or system failures in production environments. Hotfixes bypass the usual release process to minimize disruption and reduce risk to users. They are typically deployed immediately when issues threaten functionality, security, or uptime. After applying a hotfix, teams often follow up with more comprehensive fixes during regular release cycles.
What a hotfix looks like in software development
A hotfix follows a short, strict path. A typical example:
An online shop releases version 2.4.0 of its app on Monday. On Tuesday, customers paying by card see a blank screen at checkout, and orders stop.
- Confirm and scope. The team reproduces the problem and finds the cause: new discount code logic that fails when no code is entered.
- Branch from what is live. The developer starts from the exact code running in production (the 2.4.0 version), not from the main development branch, which already contains unfinished work for 2.5.
- Make the smallest possible fix. A few lines to handle the missing value. No refactoring and no extra features.
- Test the fix and the flow around it. Automated tests plus a focused manual check of checkout.
- Release as 2.4.1 through the same deployment pipeline as normal, just faster.
- Merge the fix back into the main branch so the bug does not return in 2.5.
- Review afterwards why the bug reached production and what would catch it next time.
Hotfix vs patch vs regular release
Teams use these terms loosely. The usual distinctions:
- Hotfix: triggered by an urgent production problem. Ships immediately, outside the normal schedule. Fixes one issue with the smallest change possible, with fast, focused testing. Usually bumps the last digit of the version number, for example 2.4.0 to 2.4.1.
- Patch: a planned update that fixes known bugs or security issues without adding features. Often bundled and released on a schedule, with normal testing.
- Regular release: planned features, improvements and fixes on the normal release cycle, with full regression testing. Usually bumps the middle or first digit, for example 2.5.0 or 3.0.0.
In short, every hotfix is a kind of patch, but not every patch is a hotfix. "Hotfix" signals urgency and an approved exception to the normal process.
Hotfixes on mobile apps
On the web, a hotfix can go live within minutes. Mobile apps are slower: a new iOS or Android build usually has to pass app store review, and users have to update. Teams reduce this delay with feature flags that can switch off a broken feature remotely, by keeping key business logic on the server where it can be fixed without a new app build, and by requesting expedited review for critical issues.
Common hotfix mistakes
- Fixing on the wrong branch, which ships unfinished features along with the fix.
- Scope creep: extra "while we're in there" changes that add new risk.
- Skipping tests because it is urgent, which can cause a second incident.
- Forgetting to merge back, so the next regular release brings the bug back.
- Hotfixes becoming routine. Frequent hotfixes point to gaps in testing or the release process.
What to ask your development team
- Do we have a written hotfix process, and who can approve one?
- How quickly can we ship a fix to production and to each app store?
- Can we turn off a feature remotely without a new release?
If you want a release process that makes urgent fixes safe and fast, our custom software development team can help you set one up.
Related service: Custom Software Development
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