FusionAuth has released version 1.55.1, dubbed "The Holiday Hippo," which includes several notable features such as improved SAML encryption support, enhanced API key security with expiration options, and the ability to configure connect and read timeouts for lambda functions. The release also addresses various performance improvements and bug fixes, including support for passing parameters to hosted back-end pages and a refresh token grace period. Overall, this update brings additional flexibility, security, and control to FusionAuth users.