While IBM Connections 6 has already been released, the last version of course still gets some love: the Cumulative Refresh (CR) 3 has been released.
The Guide for applying the CR3 to Connections 5.5 can be found here.
And of course here the list of the download locations:
FixCentral: IBM Connections 5.5 CR3
FixCentral: TDISol Update for Windows
FixCentral: TDISol Update for Linux and AIX
FixCentral: Ephox Editors Update for CR3
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Here is the list of things that are being fixed: