diff --git a/.changeset/beige-grapes-wink.md b/.changeset/beige-grapes-wink.md
new file mode 100644
index 00000000..61fc9db5
--- /dev/null
+++ b/.changeset/beige-grapes-wink.md
@@ -0,0 +1,7 @@
+---
+"tiktoken": patch
+"js-tiktoken": patch
+"@dqbd/tiktoken": patch
+---
+
+Add missing historic models, fix incorrect tokenizers for old instruct models