Begging your pardon for jumping into what is essentially a Christian thread. The Hebrew scriptural canon was sealed much earlier, at the time of the Knessiah Gedolah (Great Synod) at the end of the Babylonian exile and the beginning of the Second Temple. But because some "modern biblical scholars" wished to assign a later date to some of the scriptures, they arbitrarily moved the sealing up to Yavneh. But according to Jewish rabbinic authority, the scriptures were sealed long before that. The Book of Esther was the latest book of scripture included in the Hebrew canon.
When was the great synod, and what do you say to this part of the article:
During the first century, the Jews disagreed as to what constituted the canon of Scripture. In fact, there were a large number of different canons in use, including the growing canon used by Christians. In order to combat the spreading Christian cult, rabbis met at the city of Jamnia or Javneh in A.D. 90 to determine which books were truly the Word of God. They pronounced many books, including the Gospels, to be unfit as scriptures. This canon also excluded seven books (Baruch, Sirach, 1 and 2 Maccabees, Tobit, Judith, and the Wisdom of Solomon, plus portions of Esther and Daniel) that Christians considered part of the Old Testament.
Why did they meet if it had already been sealed?
Did a google search on "Knessiah Gedolah" and got 19 hits all refering to recent meetings. Can you supply some references?