The latest stable release of Apache Traffic Server is 5.1.1, released on 2014-10-31. New in the 4.x releases is that we now follow the Semantic Versioning scheme. The goal is to release minor versions quarterly, and within the major version these are all compatible.

When downloading from a mirror, please be sure to verify the checksums and OpenPGP compatible signature. You can also browse through all releases and checksum signatures.

Current v5.x Release -- 5.2.0

Apache Traffic Server 5.1.2 was released on January 14, 2015. [PGP] [MD5] [SHA1]

Traffic Server 5.2.0

v5.2.0 is our latest stable release, which is backwards compatible with previous 5.1.x and 5.0.x releases. Please see the 5.2.xNews section for what is new in this release. Additional details are also in the CHANGESlog.

Current v4.x Release (Long Term Support) -- 4.2.3

Apache Traffic Server 4.2.3 was released on February 3, 2015. [PGP] [MD5] [SHA1]

Traffic Server 4.2.3

This is primarily bug fix release since 4.1.2, but there is also a host of new features and minor improvements or cleanups on the code-base.

Upgrading from v3.2 to v4.x implies reinitializing the cache, so existing cache data will be erased. This should happen automatically on startup, but please be careful. For details on upgrading to v4.x, see these instructions.

More details are also in the CHANGES log and the the Jira Release Notes

Archived Releases

Apache Traffic Server Archive

Note: Upgrading from v2.0.x or v2.1.8 and earlier requires that you migrate to the new records.config configuration file. You should also clear all caches after upgrading (e.g. sudo traffic_server -Cclear), as well as deleting the hostdb files (var/trafficserver/host.db and etc/trafficserver/internal/hostdb.config).