Bump version to 2.3.1

Author: LogCreative

RELEASES.md

@@ -6,6 +6,10 @@
 
 ## [Unreleased]
 
+
+
+## [v2.3.1] - 2026-03-12
+
 ### Changed
 
 - 注释英文大摘要（[#1137](https://github.com/sjtug/SJTUThesis/pull/1137)）。
@@ -56,7 +60,8 @@
 SJTUThesis v2.0 正式发布！
 
 
-[Unreleased]: https://github.com/sjtug/SJTUThesis/compare/v2.2.1...HEAD
+[Unreleased]: https://github.com/sjtug/SJTUThesis/compare/v2.3.1...HEAD
+[v2.3.1]:     https://github.com/sjtug/SJTUThesis/compare/v2.2.1...v2.3.1
 [v2.2.1]:     https://github.com/sjtug/SJTUThesis/compare/v2.1.5...v2.2.1
 [v2.1.5]:     https://github.com/sjtug/SJTUThesis/compare/v2.1.4...v2.1.5
 [v2.1.4]:     https://github.com/sjtug/SJTUThesis/compare/v2.1.3...v2.1.4