March 7, 2013 Patch

Source: Team Fortress 2, Day of Defeat: Source and Half-Life 2: Deathmatch Updates Released

Patch notes

Source Engine Changes (TF2, DoD:S, HL2:DM)

• Added a new ConVar sb_filter_incompatible_versions. This will default to true and hide servers on the Internet tab that are running incompatible versions.