Well, Hebrew is pretty much the same as it was, isn’t it? I guess I am missing something here.
Aramaic was adopted by the Persian Empire as its official tongue, which looks odd now, but resulted in Aramaic being spoken by more people than perhaps any language in the world up to that time (remembering that China's languages are many, and India was divided among at least four or five different ethnic groups). Hebrew and Aramaic are both Semitic languages (Persian is from the Indo-European tree, which has numerically more speakers than any other family of languages), but Hebrew writing was adapted for use by Aramaic-speaking Hebrews.