diff --git a/CHANGELOG.md b/CHANGELOG.md
index 85a4fd1..9328e43 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,13 @@ reproducing 70+ versions of notes.
 
 ## [Unreleased]
 
+### Fixed
+- The DPO / IPO / KTO / BCO trainers now apply configured vocabulary expansion
+  (`data.add_new_tokens` / `data.new_special_tokens`) via the shared
+  `apply_vocab_expansion()` helper during setup, consistent with the SFT path —
+  they previously ignored it. Closes #292
+  ([#293](https://github.com/MakazhanAlpamys/Soup/pull/293) by [@CODING-DARSH](https://github.com/CODING-DARSH)).
+
 ## [0.71.27] - 2026-07-03
 
 ### Added
diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index 7152804..697ae9d 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -48,6 +48,7 @@ Listed by first contribution. PR numbers link the work.
   - Harden judge-URL validation against hostname prefix bypass (`startswith` → `urlparse`) in `eval/gate.py` ([#288](https://github.com/MakazhanAlpamys/Soup/pull/288))
   - Apply configured vocabulary expansion (`data.add_new_tokens` / `new_special_tokens`) during SFT trainer init ([#287](https://github.com/MakazhanAlpamys/Soup/pull/287))
   - Reuse the shared vocab-expansion helper in the vision + audio SFT paths ([#291](https://github.com/MakazhanAlpamys/Soup/pull/291))
+  - Honor configured vocab expansion in the DPO / IPO / KTO / BCO trainers ([#293](https://github.com/MakazhanAlpamys/Soup/pull/293))
 
 ---