diff --git a/CHANGELOG.md b/CHANGELOG.md
index b0dcda606..857a48825 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,17 +11,31 @@ for the source-code artifacts of each version.
 
 ## Unreleased
 
-### Pynguin 0.39.0
+## Pynguin 0.40.0
+
+- Provide a (normalised) area under curve for timeline output variables.
+
+  Variables for statistics that produce a timeline, e.g., coverage development over time
+  imply in interesting property: while the final coverage of two distinct
+  runs/configurations might be equal, one might have a faster coverage increase than the
+  other, thus could be considered better.  The area under curve, i.e., the integral over
+  the development function allows to access this property easily.
+- Add the ability to write the logging to a log file and not only STDOUT.
+- Add an auto-deploy action to GitHub to push releases to PyPI.
+- Fix a typo in the documentation (cf. GitHub issue #75).
+- Switch to `ruff-format`.
+
+## Pynguin 0.39.0
 
 - Fix a bug in the handling of infinite loops in global scope (thanks to @BergLucas in
   #65)
 
-### Pynguin 0.38.0
+## Pynguin 0.38.0
 
 - Remove the dependency to our custom [MutPy fork](https://github.com/se2p/MutPy-Pynguin)
   by integrating the relevant code into Pynguin directly (thanks to @BergLucas in #64)
 
-### Pynguin 0.37.0
+## Pynguin 0.37.0
 
 - Add possibility to control number of mutations in MOSA.
 - Compute the area under curve if Pynguin traces the overage over time; area under curve
diff --git a/docker/Dockerfile b/docker/Dockerfile
index 26357b50d..4cb766140 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -36,7 +36,7 @@ FROM python:3.10.14-slim-bullseye AS execute
 
 # Set environment variables
 # Set the Pynguin version
-ENV PYNGUIN_VERSION "0.40.0.dev0"
+ENV PYNGUIN_VERSION "0.40.0"
 # Pynguin requires to set the variable to show it that the user is aware that running
 # Pynguin executes third-party code, which could cause arbitrary harm to the system.
 # By setting the variable, the user acknowledges that they are aware of this.  In the
diff --git a/pyproject.toml b/pyproject.toml
index 0d7e00bfa..28104594c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@
 
 [tool.poetry]
 name = "pynguin"
-version = "0.40.0.dev"
+version = "0.40.0"
 description = "Pynguin is a tool for automated unit test generation for Python"
 authors = ["Stephan Lukasczyk <stephan@pynguin.eu>"]
 license = "MIT"
diff --git a/src/pynguin/__version__.py b/src/pynguin/__version__.py
index 7870e02d8..726b32dca 100644
--- a/src/pynguin/__version__.py
+++ b/src/pynguin/__version__.py
@@ -6,4 +6,4 @@
 #
 """Specifies the version of Pynguin."""
 
-__version__ = "0.40.0.dev"
+__version__ = "0.40.0"