mold 1.0.3 is a maintenance release of the high-speed linker. It contains only the following bug fix:

• build-static.sh didn't create a statically-linked mold executable (https://github.com/rui314/mold/issues/315). The problem is now fixed. (601b9e691c24f51345ec9242e8017054c166fc36)

If you are not using build-static.sh to build mold executable, you don't need to upgrade from 1.0.2 to 1.0.3.