pacman update conflict

[Sander Jansen <s.jansen@xxxxxxxxx>]

:: Synchronizing package databases...
 testing                   29.7 KiB   238K/s 00:00 [######################] 100%
 core                     102.1 KiB   296K/s 00:00 [######################] 100%
 extra                   1170.6 KiB   816K/s 00:01 [######################] 100%
 community-testing         11.1 KiB   244K/s 00:00 [######################] 100%
 community                999.7 KiB   673K/s 00:01 [######################] 100%
 multilib-testing        1574.0   B  71.5M/s 00:00 [######################] 100%
 multilib                  67.8 KiB   339K/s 00:00 [######################] 100%
:: The following packages should be upgraded first :
    pacman
:: Do you want to cancel the current operation
:: and upgrade these packages now? [Y/n] y

resolving dependencies...
looking for inter-conflicts...
error: failed to prepare transaction (could not satisfy dependencies)
:: gcc: requires gcc-libs=4.6.2-1
:: valgrind: requires glibc<2.15

Any suggestions on how to fix this conflict?

Thanks,

Sander