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Suricata (Stable) version is 4.0.4 released February 14, 2018.

Suricata (Development) version is 4.1.0-beta1 released March 23, 2018.

Older releases can be found here https://www.openinfosecfoundation.org/downloads/

Suricata bundles the latest libhtp. See https://github.com/OISF/libhtp/releases

The source code is available at our server and github. Both are kept in sync: