diff --git a/.github/workflows/github-pages.yml b/.github/workflows/github-pages.yml
index a3d5b47..cd8f4d2 100644
--- a/.github/workflows/github-pages.yml
+++ b/.github/workflows/github-pages.yml
@@ -6,7 +6,7 @@ env:
   POETRY_VERSION: "1.7.1"
   PYTHON_VERSION: "3.9"
   PACKAGE_NAME: "paramview"
-  PACKAGE_VERSION: "0.3.0"
+  PACKAGE_VERSION: "0.4.0"
 
 jobs:
   build:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 75cb089..fbc4294 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,12 @@ project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0).
 
 ## [Unreleased]
 
+## [0.4.0] (Jan 4 2024)
+
+### Added
+
+- Command line option to not open a new browser window (used in internal testing)
+
 ## [0.3.0] (Dec 8 2023)
 
 ### Added
@@ -45,7 +51,8 @@ project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0).
 - CLI command `paramview` for launching the GUI.
 - `start_server` Python function to launch the GUI.
 
-[unreleased]: https://github.com/PainterQubits/paramview/compare/v0.3.0...main
+[unreleased]: https://github.com/PainterQubits/paramview/compare/v0.4.0...main
+[0.4.0]: https://github.com/PainterQubits/paramview/releases/tag/v0.4.0
 [0.3.0]: https://github.com/PainterQubits/paramview/releases/tag/v0.3.0
 [0.2.0]: https://github.com/PainterQubits/paramview/releases/tag/v0.2.0
 [0.1.1]: https://github.com/PainterQubits/paramview/releases/tag/v0.1.1
diff --git a/CITATION.cff b/CITATION.cff
index 7fb3535..b50f0c2 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -4,6 +4,6 @@ authors:
   - family-names: "Hadley"
     given-names: "Alex"
 title: "ParamView"
-version: 0.3.0
-date-released: 2023-12-08
+version: 0.4.0
+date-released: 2024-01-04
 url: "https://github.com/PainterQubits/paramview"
diff --git a/package.json b/package.json
index 4756114..d48425e 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "paramview",
   "private": true,
-  "version": "0.3.0",
+  "version": "0.4.0",
   "type": "module",
   "scripts": {
     "dev": "vite",
diff --git a/pyproject.toml b/pyproject.toml
index 8ef8467..cebc489 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "poetry.core.masonry.api"
 
 [tool.poetry]
 name = "paramview"
-version = "0.3.0"
+version = "0.4.0"
 description = "GUI for viewing the contents of a ParamDB database."
 authors = ["Alex Hadley <contact@alexhadley.net>"]
 license = "BSD-3-Clause"