--- a/cook.conf
+++ b/cook.conf
@@ -62,9 +62,9 @@
 CONFIGURE_ARGS="--build=$BUILD_SYSTEM --host=$HOST_SYSTEM"
 
 # Mirrors URLs. To download sources near your location.
-GNU_MIRROR="ftp://sunsite.cnlab-switch.ch/mirror/gnu"
-SF_MIRROR="http://switch.dl.sourceforge.net/sourceforge"
-XORG_MIRROR="ftp://ftp.solnet.ch/mirror/x.org/pub/individual"
+GNU_MIRROR="https://ftp.gnu.org/gnu"
+SF_MIRROR="https://download.sourceforge.net"
+XORG_MIRROR="https://www.x.org/archive/individual"
 GNOME_MIRROR="http://ftp.gnome.org/pub/GNOME/sources"
 
 # List of packages installed by cook or the Cooker setup.