Source SDK Release Notes
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Important:
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Note:The latest release note on Steam News page is no longer updated.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 update (11/1 - 11/23/2025)
Multiplayer (Team Fortress 2 branch)
code: Include all bug fixes and latest code.- View changes on GitHub
Source code
- Source 2013 Singleplayer: Source SDK 2013 GitHub repo.
- Note:SP code has not been yet updated since 2014.
- TF2 branch (New Source 2013 MP): Source SDK 2013 GitHub repo.
- Last updated as of Nov 23, 2025.
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.