Source SDK Release Notes

Important:

If you see this page when you first open the "Source SDK" (also referred as Source SDK Legacy, AppID 211) launcher, please note that the standalone Source SDK tool/launcher is no longer updated, and does not support Source 2013 and Team Fortress 2 branch games.
The deprecated Source SDK tools are provided to create content-based mods for Source Multiplayer, Source 2009 or earlier, and to obtain source code & create or maintain legacy mods built on Source SDK Base 2006 and Source SDK Base 2007.

Many Source 2013 and Team Fortress 2 branch games are usually shipped with Source SDK preinstalled, located in the \bin folder. To launch the SDK applications (Hammer, HLMV, etc...) manually on Source 2013 games, see the SDK Installation - Source 2013 (SteamPipe) & TF2 branch section for a list of applications and their executables.

Note:The latest release note on Steam News page is no longer updated. Instead release notes and changes below are copied from source-sdk-2013 GitHub Commits history. It is also recommended that you visit Source SDK 2013 GitHub page and view recent changes there, as this page may not be up to date.

Source SDK 2013 code update (03/12 - 03/31/2026)

Multiplayer (Team Fortress 2 branch)

TF2 code fixes/changes:

• Allow VScript to set damage for force calc
• Fix Short circuit for disguised spies
• Fix most broken spy disguise weapons.
• Changed Halloween Spell attribute text to be blue during Full Moons.
• View changes on GitHub (March 12 to March 31)

Source SDK Base 2013

Multiplayer - "prerelease" (5/13/2025)

• Latest pre-release build.

Multiplayer (2/18/2025)

• Initial release running on Team Fortress 2 branch.

Singleplayer - "upcoming" branch (9/29/2014)

• Remains unchanged as of 2026.

Singleplayer (5/15/2014)

• Remains unchanged as of 2026. It is highly recommend to use "upcoming" beta branch instead.

Source code

• Source 2013 Singleplayer: Source SDK 2013 GitHub repo (Singleplayer branch).
  • Note:SP code has not been yet updated since 2014.
• Team Fortress 2 branch: Source SDK 2013 GitHub repo (Master/MP branch).
  • Last updated as of May 2, 2026.

Report Issues

• If you encounter any problems with this release (bugs, crashes, etc...), visit GitHub Issues page to report or search existing issues:
  • Source 1 Games repo - find / report bugs that affecting Valve games.
  • Source SDK 2013 repo - find / report bugs affecting the Source SDK itself, and Source SDK Base 2013.
  • Important:Always search for existing issues before creating new bug report, to prevent duplicated bug reports.

Previous releases

• See the Source SDK release notes archive for information on previous releases.