What are you talking about? Do you think we still own slaves and prohibit women from voting in the United States? Updates to the constitution are exactly why neither of those things is true. These updates are called amendments, and the constitution itself outlines that process. In 250 years, we've passed 27 amendments. The most recent amendment passed in 1992. Pretending even the most strict constructionist treats the constitution as an immutable document is just ignorant.