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Suricata (Stable) version is 4.0.0 released July 27, 2017.

Suricata (Old Stable) version is 3.2.3 released July 13, 2017.

Older releases can be found here http://downloads.suricata-ids.org/

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