The Koha development team has announced security releases for each of the currently maintained versions of Koha. The following releases have been announced: Koha 16.11.03 Koha 16.05.09 Koha 3.22.16 These releases include important fixes for security vulnerabilities. It's strongly recommended that users upgrade. More information is in the release notes for the respective versions: https://koha-community.org/category/release/ Versions of Koha below 3.22 are no longer officially maintained and users are advised to upgrade as soon as possible. Bob Birchall Calyx