In all the upload wizards for Wiki Loves Monuments since today CC BY-SA-4.0 is used, instead of 3.0. This change has been implemented as 4.0 is the most updated license that is promoted by Creative Commons.

Please check your documentation for the mentioning of CC BY-SA-3.0 and change this to CC BY-SA-4.0. Please also note that localised CC BY-SA-xx (with the xx the country code of your language) also changes to CC BY-SA-4.0 (without the suffix!!).

Examples:
CC BY-SA-3.0 changes to CC BY-SA-4.0
CC BY-SA-3.0-at changes to CC BY-SA-4.0
CC BY-SA-3.0-de changes to CC BY-SA-4.0
CC BY-SA-3.0-es changes to CC BY-SA-4.0

Also:
CC BY-3.0 changes to CC BY-4.0