ByWater Major Release Cycles
As of December 2025, Koha upgrades will be completed according to the schedule below.
Milestone
| xx.11 - Spring Upgrade Cycle
General Production Upgrade in April
| xx.05 - Fall Upgrade Cycle
General Production Upgrade in October |
Major upgrade for test servers and early adopters | 2nd Monday in March, and again on the 1st Monday in April for an updated package | 2nd Monday in September, and again on the 1st Monday in October for an updated package |
General upgrade for production servers | 3rd full week in April on Tuesday, Wednesday, and Thursday — refer to the news item posted on your staff client for the exact weekday on which your Koha will be upgraded | 3rd full week in October on Tuesday, Wednesday, and Thursday — refer to the news item posted on your staff client for the exact weekday on which your Koha will be upgraded |
First PS (minor) upgrade of the new release cycle | 3rd full week in May on Tuesday, Wednesday, and Thursday
PS upgrades for the xx.11 cycle continue on this same schedule in June, July, and August. | 3rd full week in November on Tuesday, Wednesday, and Thursday
PS upgrades for the xx.05 cycle continue on this same schedule in December, January, and February. |
Frequently Asked Questions
When do Koha upgrades take place?
ByWater's Koha partners receive a new major release of Koha every April and October. PS or "minor" upgrades containing bugfixes are released monthly except in April and October (when they are replaced by major upgrades) and in March and September (when ByWater prepares for the next major upgrade).
Upgrades are always applied after 9pm in the timezone that is local to the partner library.
What's the difference between major and PS updates?
Major upgrades contain new features and enhancements requested by members of the global Koha community. PS updates primarily focus on bug fixes.
Is there anything my library needs to do following an upgrade?
After a major upgrade, we recommend that library staff clear the cache in their browsers as soon as possible on the morning after the upgrade takes place. Libraries may also wish to check if any plugins need to be updated; this is particularly important for any partners that make use of EDI. See
How to Update Plugins in Koha for more information.
Are upgrades rolled out on holidays?
Upgrades do not take place on holidays. Production servers are upgrades only on Tuesdays, Wednesdays, and Thursdays as of July 2026. (Prior to July 2026, some partners may have received production upgrades on Mondays; these partners now receive upgrades on Tuesdays instead.)