diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8a8190c..f0973da 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,12 +14,17 @@
 
 ## [Unreleased]
 ### Added    
+### Changed    
+### Removed    
+
+## [0.4.0] - 2023-12-23
+### Added    
 * `AxesAnaglyph.imshow_stereo()` for generating anaglyphs from existing image data
 * `mpl_stereo.example_data` module
 * `AxesStereo2D` and `AxesStereo3D` keep track of their artists in `.artists_left` and `artists_right`
+* Derivation of geometry
 ### Changed    
 * Minimal whitespace between AxesStereo2D subplots
-### Removed    
 
 ## [0.3.1] - 2023-12-21
 ### Added    
diff --git a/poetry.lock b/poetry.lock
index d7d5e14..3813ec5 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -899,13 +899,13 @@ files = [
 
 [[package]]
 name = "setuptools"
-version = "69.0.2"
+version = "69.0.3"
 description = "Easily download, build, install, upgrade, and uninstall Python packages"
 optional = false
 python-versions = ">=3.8"
 files = [
-    {file = "setuptools-69.0.2-py3-none-any.whl", hash = "sha256:1e8fdff6797d3865f37397be788a4e3cba233608e9b509382a2777d25ebde7f2"},
-    {file = "setuptools-69.0.2.tar.gz", hash = "sha256:735896e78a4742605974de002ac60562d286fa8051a7e2299445e8e8fbb01aa6"},
+    {file = "setuptools-69.0.3-py3-none-any.whl", hash = "sha256:385eb4edd9c9d5c17540511303e39a147ce2fc04bc55289c322b9e5904fe2c05"},
+    {file = "setuptools-69.0.3.tar.gz", hash = "sha256:be1af57fc409f93647f2e8e4573a142ed38724b8cdd389706a867bb4efcf1e78"},
 ]
 
 [package.extras]
diff --git a/pyproject.toml b/pyproject.toml
index 579e2fb..b634f1d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "mpl_stereo"
-version = "0.3.1"
+version = "0.4.0"
 description = "See your matplotlib plots in 3D by making stereograms and anaglyphs"
 authors = ["Scott Shambaugh <scottshambaugh@users.noreply.github.com>"]
 license = "MIT"