diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1c58de04..6165fd6a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,7 +5,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [2.3.1] - 2026-02-15
 
 ### Fixed
 - Fix docs/PyPI version mismatch (issue #146) — RTD now builds versioned docs from source
@@ -700,6 +700,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   - `to_dict()` and `to_dataframe()` export methods
   - `is_significant` and `significance_stars` properties
 
+[2.3.1]: https://github.com/igerber/diff-diff/compare/v2.3.0...v2.3.1
 [2.3.0]: https://github.com/igerber/diff-diff/compare/v2.2.1...v2.3.0
 [2.2.1]: https://github.com/igerber/diff-diff/compare/v2.2.0...v2.2.1
 [2.2.0]: https://github.com/igerber/diff-diff/compare/v2.1.9...v2.2.0
diff --git a/diff_diff/__init__.py b/diff_diff/__init__.py
index 4be00bb6..666ddd5d 100644
--- a/diff_diff/__init__.py
+++ b/diff_diff/__init__.py
@@ -142,7 +142,7 @@
     load_mpdta,
 )
 
-__version__ = "2.3.0"
+__version__ = "2.3.1"
 __all__ = [
     # Estimators
     "DifferenceInDifferences",
diff --git a/pyproject.toml b/pyproject.toml
index 974091d2..cd32b103 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "maturin"
 
 [project]
 name = "diff-diff"
-version = "2.3.0"
+version = "2.3.1"
 description = "A library for Difference-in-Differences causal inference analysis"
 readme = "README.md"
 license = "MIT"
diff --git a/rust/Cargo.toml b/rust/Cargo.toml
index c641e82d..8b36862f 100644
--- a/rust/Cargo.toml
+++ b/rust/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "diff_diff_rust"
-version = "2.3.0"
+version = "2.3.1"
 edition = "2021"
 description = "Rust backend for diff-diff DiD library"
 license = "MIT"