diff --git a/Performance-Tuning.md b/Performance-Tuning.md
index e90dad8..92473e3 100644
--- a/Performance-Tuning.md
+++ b/Performance-Tuning.md
@@ -283,6 +283,6 @@ In addition to the above, it's strongly advised to use DNS caching either locall
 - [libtorrent manual](http://www.libtorrent.org/tuning.html) (NB: This is not the rakshasa libtorrent, but still contains useful information)
 - [lost rTorrent docs](http://web.archive.org/web/20131104130853/http://libtorrent.rakshasa.no/wiki/RTorrentPerformanceTuning)
 - [rTorrent research](https://calomel.org/rtorrent_mods.html)
-- [c-ares](http://c-ares.haxx.se)
+- [c-ares](https://c-ares.org/)
 - [Local DNS Cache](https://help.ubuntu.com/community/Dnsmasq#Local_DNS_Cache)
-- [Networking tweaks](http://wiki.mikejung.biz/Sysctl_tweaks)
\ No newline at end of file
+- [Networking tweaks](http://web.archive.org/web/20200706222821/https://wiki.mikejung.biz/Sysctl_tweaks)
\ No newline at end of file