With variable products, specific sizes don't show as sold out

I’ve noticed that if my product has variable information, like different sizes, there is an issue when one of the sizes sells out.

For example, let’s say for a particular product the Smalls are in stock but the Mediums are sold out. Even though the size “Mediums” are sold out, it still displays “Medium” as an option in the drop-down menu for size. Then, once I click on “Medium,” The dropdown menu collapses and it displays the selection as being a size “Small.”

This could cause ordering confusion: Some customers may not notice that their selection has switched to a different size than the one they clicked on. Is there any way to fix this? I would like for the sold-out sizes to be displayed in the dropdown menu as gray, unclickable options that say “Medium- sold out.”

My site is Dorici