diff --git a/README.md b/README.md
index f395e49a..cb2c8cb2 100644
--- a/README.md
+++ b/README.md
@@ -33,7 +33,7 @@ Twitter: [@neilpangxa](https://twitter.com/neilpangxa)
 - [webfaction](https://community.webfaction.com/questions/19988/using-letsencrypt)
 - [Loadbalancer.org](https://www.loadbalancer.org/blog/loadbalancer-org-with-lets-encrypt-quick-and-dirty)
 - [discourse.org](https://meta.discourse.org/t/setting-up-lets-encrypt/40709)
-- [Centminmod](http://centminmod.com/letsencrypt-acmetool-https.html)
+- [Centminmod](https://centminmod.com/letsencrypt-acmetool-https.html)
 - [splynx](https://forum.splynx.com/t/free-ssl-cert-for-splynx-lets-encrypt/297)
 - [archlinux](https://aur.archlinux.org/packages/acme.sh-git/)
 - [opnsense.org](https://github.com/opnsense/plugins/tree/master/security/acme-client/src/opnsense/scripts/OPNsense/AcmeClient)