diff --git a/CHANGELOG.md b/CHANGELOG.md
index 250e3dc1..9f0d4ac4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,6 @@
-# Unreleased
+# Version 1.4.0 (3 Aug 2026)
 
+- Added Bayesian analysis: run MCMC sampling alongside classical fitting, with posterior median and credibility intervals on the main chart, trace/corner-style plots per parameter, a dedicated status display with cancellation support, and plot export.
 - Bayesian results are now cleared whenever they become stale: on project create/load/reset, when a classical fit starts, and when a new sampling run starts. Previously the posterior overlays, plots and the "Bayesian Sampling Results" dialog could show results from a superseded run or a different project.
 - Cancelling a fit now keeps the UI locked until the worker thread actually exits, and late signals from a superseded worker are ignored. This prevents two fits from mutating the shared parameters concurrently when the minimizer cannot abort mid-run (lmfit, DFO).
 - Bayesian sampling no longer fails for data files without uncertainty/resolution columns: missing `ye` falls back to zero variances (reported by the sampler with a clear message) and the unused `xe` is no longer attached to the Q coordinate.
diff --git a/EasyReflectometryApp/Backends/Mock/Home.qml b/EasyReflectometryApp/Backends/Mock/Home.qml
index 6e4c1d63..e2a89413 100644
--- a/EasyReflectometryApp/Backends/Mock/Home.qml
+++ b/EasyReflectometryApp/Backends/Mock/Home.qml
@@ -7,8 +7,8 @@ QtObject {
     property bool created: false
 
     readonly property var version: {
-        'number': '1.3.1',
-        'date': '1 May 2026',
+        'number': '1.4.0',
+        'date': '3 Aug 2026',
     }
 
     readonly property var urls: {
diff --git a/EasyReflectometryApp/__version__.py b/EasyReflectometryApp/__version__.py
index 72837bdc..96e3ce8d 100644
--- a/EasyReflectometryApp/__version__.py
+++ b/EasyReflectometryApp/__version__.py
@@ -1 +1 @@
-__version__ = '1.3.1'
+__version__ = '1.4.0'
diff --git a/INSTALLATION.md b/INSTALLATION.md
index 1432c4ed..a8bfca08 100644
--- a/INSTALLATION.md
+++ b/INSTALLATION.md
@@ -2,10 +2,10 @@
 
 To make the installation of EasyReflectometry as easy as possible, we prepare packaged releases for three major operating systems: 
 
-- [Windows](https://github.com/EasyScience/EasyReflectometryApp/releases/download/v1.3.1/EasyReflectometryApp_v1.3.1_windows-2022.exe)
-- [MacOS](https://github.com/EasyScience/EasyReflectometryApp/releases/download/v1.3.1/EasyReflectometryApp_v1.3.1_macos-14-AppleSilicon.zip) (ARM)
-- [Linux](https://github.com/EasyScience/EasyReflectometryApp/releases/download/v1.3.1/EasyReflectometryApp_v1.3.1_ubuntu-22.04) (built on Ubuntu-22.04)
-- [Linux](https://github.com/EasyScience/EasyReflectometryApp/releases/download/v1.3.1/EasyReflectometryApp_v1.3.1_ubuntu-24.04) (built on Ubuntu-22.04)
+- [Windows](https://github.com/EasyScience/EasyReflectometryApp/releases/download/v1.4.0/EasyReflectometryApp_v1.4.0_windows-2022.exe)
+- [MacOS](https://github.com/EasyScience/EasyReflectometryApp/releases/download/v1.4.0/EasyReflectometryApp_v1.4.0_macos-14-AppleSilicon.zip) (ARM)
+- [Linux](https://github.com/EasyScience/EasyReflectometryApp/releases/download/v1.4.0/EasyReflectometryApp_v1.4.0_ubuntu-22.04) (built on Ubuntu-22.04)
+- [Linux](https://github.com/EasyScience/EasyReflectometryApp/releases/download/v1.4.0/EasyReflectometryApp_v1.4.0_ubuntu-24.04) (built on Ubuntu-22.04)
 
 If the relevant EasyReflectometry installation does not work on your system, then please try installation from source. 
 
diff --git a/docs/src/conf.py b/docs/src/conf.py
index ab143d8a..d3c9b98d 100644
--- a/docs/src/conf.py
+++ b/docs/src/conf.py
@@ -78,9 +78,9 @@
 # the built documents.
 #
 # The short X.Y version.
-version = '1.3.1'
+version = '1.4.0'
 # The full version, including alpha/beta/rc tags.
-release = '1.3.1'
+release = '1.4.0'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/docs/src/tutorial.md b/docs/src/tutorial.md
index 479266ad..7e2b1682 100644
--- a/docs/src/tutorial.md
+++ b/docs/src/tutorial.md
@@ -1,6 +1,6 @@
 # Getting started
 This is the tutorial for EasyReflectometryApp and how to use it.  
-Version: 1.3.1
+Version: 1.4.0
 
 ## Home page
 When opening up the EasyRecletometryApp you are presented with the **Home** page.  
diff --git a/pyproject.toml b/pyproject.toml
index 07db221d..47eb19f9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = 'hatchling.build'
 
 [project]
 name = 'EasyReflectometryApp'
-version = '1.3.1'
+version = '1.4.0'
 description = "Making reflectometry data analysis and modelling easy."
 authors = [
     {name = "Andrew R. McCluskey"},