TIM Italy has already posted 188.8.131.52 release for Blackberry Curve 8900, but in case you need it, here is the information on release from Rogers.
Software For BlackBerry® Curve (TM) 8900 smartphone
BlackBerry Handheld Software v184.108.40.2068 (Multilanguage)
Package Version: 220.127.116.118
* Applications: 18.104.22.168
* Software Platform: 22.214.171.124
* File name: 8900M_PBr4.6.1_rel378_PL126.96.36.199_A188.8.131.52_Rogers_Wireless_Inc.exe
* File size: 123.35MB
NOTE: Don’t forget to delete the vendor.xml file located in c:program files>common files>research in motion>apploader to install it on a different carriers device.