execute `git diff $path_to_submodule`, you should be able to see something like

-Subproject commit 7e5b9b0b89ebf56e71e161f8acfab1c95ce8e… +Subproject commit 7185f8e6850272c3224fe7b6ff44bcbc4fb0e…

then copy the commit hash in the first line

execute

cd $path_to_submodule git checkout 7e5b9b0b89ebf56e71e161f8acfab1c95ce8e…

done.