Updates for Counter-Strike: Source, Day of Defeat: Source, Half-Life Deathmatch: Source, Half-Life 2: Deathmatch, and the Source SDK 2013 Base have been released. The updates will be applied automatically when you restart the game. The major changes include:

• Various stability and security updates
• [SDK2013] Fixed NPCs not blinking
• [DoD:S] Fixed being able to switch weapons while holding a primed grenade

Website: LINK