Today IBM released IBM Traveler 188.8.131.52.
IBM Traveler 184.108.40.206 is a maintenance release that provides new features and APAR fixes for the IBM Traveler server.
IBM Traveler 220.127.116.11 does not include a database schema update. However, if upgrading from a version prior to 18.104.22.168 and running MS SQL Server, or if upgrading from a version prior to 22.214.171.124 and running DB2 Server, action may be required if you manually manage your database schema (this is not common).
Important: Due to some header file changes in Domino 9.0.1 FP10 customers who are upgrading their Traveler environment to Domino 9.0.1 FP10 should first upgrade Traveler to 126.96.36.199 or later to ensure maximum compatibility. Library differences were introduced in Domino 9.0.1 FP10. This only effects the Domino server that the Traveler environment runs on, Domino mail servers that do not host Traveler services can be at any supported level. IBM Traveler 188.8.131.52 and later releases are compatible with the Domino 9.0.1 FP10 Library changes.
For more information: IBM Traveler 184.108.40.206 Server Release Documentation
Download link IBM Fix Central: IBM Traveler 220.127.116.11
See also Technote LO93319: IBM TRAVELER SUPPORT FOR DOMINO 9.0.1 FP10.