- * [PostgreSQL](http://www.postgresql.org) (9.3 or later)
- * [PostGIS](http://postgis.refractions.net) (2.2 or later)
- * [PHP](http://php.net) (7.0 or later)
+ * [PostgreSQL](https://www.postgresql.org) (9.3 or later)
+ * [PostGIS](https://postgis.org) (2.2 or later)
+ * [PHP](https://php.net) (7.0 or later)