The current version of calibre is v9.16.0 (as of 09/10/2026). patchletter checks the official source daily and emails you new releases.
calibre at a glance
Calibre is an open source e-book management application with a converter, metadata editing, a reader, device support and a built-in content server. In public agencies, libraries and companies it usually runs as a workstation program on Windows, macOS or Linux; occasionally IT operates the content server so collections are reachable over the network. For administrators it is therefore widespread endpoint software that imports files from unknown sources.
The project publishes on a short cadence, often weekly, and additionally maintains larger milestone builds that change the database layout and the extension interface. Every build is tagged publicly and provided as installer packages plus a portable variant for Windows.
Two things matter when updating: third-party plugins often lag behind larger jumps, and the library format is adjusted the first time a newer build starts, which makes going back difficult. Backing up the library before an update is therefore advisable. Anyone exposing the content server should place it behind authentication and a reverse proxy and apply security corrections promptly.
Version history & changelog · as detected by patchletter
| Version | Channel | Date | Notes |
|---|---|---|---|
| v9.16.0 | STABLE | 09/10/2026 | Release notes → |
| v9.15.0 | STABLE | 18/09/2026 | Release notes → |
| 9.14.0 | STABLE | 28/08/2026 | Release notes → |
| 9.13.0 | STABLE | 07/08/2026 | Release notes → |
Frequently asked questions
- What is the latest version of calibre?
- calibre v9.16.0, released 09/10/2026. patchletter checks the vendor's official source daily for new releases.
- Where can I find the calibre release notes?
- The version history above links to the vendor's official release notes where the vendor publishes them. patchletter deliberately stores no vendor full texts.
- How do I get notified about new calibre updates?
- Tick calibre off in the catalogue and leave your address. From then on new versions go out by email — one at a time, or bundled in the daily or weekly digest.
An email as soon as a new calibre version ships
We reconcile the vendor source daily. When a new version appears, it lands in your inbox right away or bundled as a digest. The update email is free and ends with one click. Alerts about vulnerabilities and end of support are part of patchletter Pro.
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[](https://patchletter.com/en/software/calibre)https://patchletter.com/badge/calibre.svgAlso available: ?v=eol (end of support) and ?v=cve (actively exploited).
