diff --git a/CHANGELOG.md b/CHANGELOG.md
index ead6ac48..786b729b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,29 @@
 
 <!-- <START NEW CHANGELOG ENTRY> -->
 
+## 0.4.0
+
+([Full Changelog](https://github.com/jupyter-server/jupyverse/compare/v0.3.0...73a16c326e333838aaa8ec2321c40d5d13a96f05))
+
+### Merged PRs
+
+- Check types in a separate CI job [#373](https://github.com/jupyter-server/jupyverse/pull/373) ([@davidbrochart](https://github.com/davidbrochart))
+- Add pytest color [#372](https://github.com/jupyter-server/jupyverse/pull/372) ([@davidbrochart](https://github.com/davidbrochart))
+- Update pycrdt v0.7.2 [#371](https://github.com/jupyter-server/jupyverse/pull/371) ([@davidbrochart](https://github.com/davidbrochart))
+- Implement server-side ypywidgets rendering [#364](https://github.com/jupyter-server/jupyverse/pull/364) ([@davidbrochart](https://github.com/davidbrochart))
+- Improve data read [#362](https://github.com/jupyter-server/jupyverse/pull/362) ([@davidbrochart](https://github.com/davidbrochart))
+- Replace black with ruff formatter [#361](https://github.com/jupyter-server/jupyverse/pull/361) ([@davidbrochart](https://github.com/davidbrochart))
+- Replace Ypy with pycrdt [#359](https://github.com/jupyter-server/jupyverse/pull/359) ([@davidbrochart](https://github.com/davidbrochart))
+- Set optional contents API model fields to None by default [#358](https://github.com/jupyter-server/jupyverse/pull/358) ([@davidbrochart](https://github.com/davidbrochart))
+
+### Contributors to this release
+
+([GitHub contributors page for this release](https://github.com/jupyter-server/jupyverse/graphs/contributors?from=2023-10-10&to=2023-12-16&type=c))
+
+[@davidbrochart](https://github.com/search?q=repo%3Ajupyter-server%2Fjupyverse+involves%3Adavidbrochart+updated%3A2023-10-10..2023-12-16&type=Issues) | [@pre-commit-ci](https://github.com/search?q=repo%3Ajupyter-server%2Fjupyverse+involves%3Apre-commit-ci+updated%3A2023-10-10..2023-12-16&type=Issues)
+
+<!-- <END NEW CHANGELOG ENTRY> -->
+
 ## 0.3.0
 
 ([Full Changelog](https://github.com/jupyter-server/jupyverse/compare/v0.2.5...88f061e58d22963f7b195b5677c983a7b1056b94))
@@ -17,8 +40,6 @@
 
 [@davidbrochart](https://github.com/search?q=repo%3Ajupyter-server%2Fjupyverse+involves%3Adavidbrochart+updated%3A2023-09-06..2023-10-10&type=Issues) | [@pre-commit-ci](https://github.com/search?q=repo%3Ajupyter-server%2Fjupyverse+involves%3Apre-commit-ci+updated%3A2023-09-06..2023-10-10&type=Issues)
 
-<!-- <END NEW CHANGELOG ENTRY> -->
-
 ## 0.2.5
 
 ([Full Changelog](https://github.com/jupyter-server/jupyverse/compare/v0.2.4...18f312eb8b3dee262fb512af7e7ec3996674c4d4))
diff --git a/jupyverse/__init__.py b/jupyverse/__init__.py
index 493f7415..6a9beea8 100644
--- a/jupyverse/__init__.py
+++ b/jupyverse/__init__.py
@@ -1 +1 @@
-__version__ = "0.3.0"
+__version__ = "0.4.0"
diff --git a/jupyverse_api/jupyverse_api/__init__.py b/jupyverse_api/jupyverse_api/__init__.py
index 8e1ad16a..85f58cae 100644
--- a/jupyverse_api/jupyverse_api/__init__.py
+++ b/jupyverse_api/jupyverse_api/__init__.py
@@ -4,7 +4,7 @@
 
 from .app import App
 
-__version__ = "0.3.0"
+__version__ = "0.4.0"
 
 
 class Singleton(type):
diff --git a/plugins/auth/fps_auth/__init__.py b/plugins/auth/fps_auth/__init__.py
index 493f7415..6a9beea8 100644
--- a/plugins/auth/fps_auth/__init__.py
+++ b/plugins/auth/fps_auth/__init__.py
@@ -1 +1 @@
-__version__ = "0.3.0"
+__version__ = "0.4.0"
diff --git a/plugins/auth_fief/fps_auth_fief/__init__.py b/plugins/auth_fief/fps_auth_fief/__init__.py
index 493f7415..6a9beea8 100644
--- a/plugins/auth_fief/fps_auth_fief/__init__.py
+++ b/plugins/auth_fief/fps_auth_fief/__init__.py
@@ -1 +1 @@
-__version__ = "0.3.0"
+__version__ = "0.4.0"
diff --git a/plugins/auth_jupyterhub/fps_auth_jupyterhub/__init__.py b/plugins/auth_jupyterhub/fps_auth_jupyterhub/__init__.py
index e4b455c3..8dd06e33 100644
--- a/plugins/auth_jupyterhub/fps_auth_jupyterhub/__init__.py
+++ b/plugins/auth_jupyterhub/fps_auth_jupyterhub/__init__.py
@@ -1,3 +1,3 @@
-__version__ = "0.3.0"
+__version__ = "0.4.0"
 
 from .launch import launch  # noqa
diff --git a/plugins/contents/fps_contents/__init__.py b/plugins/contents/fps_contents/__init__.py
index 493f7415..6a9beea8 100644
--- a/plugins/contents/fps_contents/__init__.py
+++ b/plugins/contents/fps_contents/__init__.py
@@ -1 +1 @@
-__version__ = "0.3.0"
+__version__ = "0.4.0"
diff --git a/plugins/frontend/fps_frontend/__init__.py b/plugins/frontend/fps_frontend/__init__.py
index 493f7415..6a9beea8 100644
--- a/plugins/frontend/fps_frontend/__init__.py
+++ b/plugins/frontend/fps_frontend/__init__.py
@@ -1 +1 @@
-__version__ = "0.3.0"
+__version__ = "0.4.0"
diff --git a/plugins/jupyterlab/fps_jupyterlab/__init__.py b/plugins/jupyterlab/fps_jupyterlab/__init__.py
index 493f7415..6a9beea8 100644
--- a/plugins/jupyterlab/fps_jupyterlab/__init__.py
+++ b/plugins/jupyterlab/fps_jupyterlab/__init__.py
@@ -1 +1 @@
-__version__ = "0.3.0"
+__version__ = "0.4.0"
diff --git a/plugins/kernels/fps_kernels/__init__.py b/plugins/kernels/fps_kernels/__init__.py
index 493f7415..6a9beea8 100644
--- a/plugins/kernels/fps_kernels/__init__.py
+++ b/plugins/kernels/fps_kernels/__init__.py
@@ -1 +1 @@
-__version__ = "0.3.0"
+__version__ = "0.4.0"
diff --git a/plugins/lab/fps_lab/__init__.py b/plugins/lab/fps_lab/__init__.py
index 493f7415..6a9beea8 100644
--- a/plugins/lab/fps_lab/__init__.py
+++ b/plugins/lab/fps_lab/__init__.py
@@ -1 +1 @@
-__version__ = "0.3.0"
+__version__ = "0.4.0"
diff --git a/plugins/login/fps_login/__init__.py b/plugins/login/fps_login/__init__.py
index 493f7415..6a9beea8 100644
--- a/plugins/login/fps_login/__init__.py
+++ b/plugins/login/fps_login/__init__.py
@@ -1 +1 @@
-__version__ = "0.3.0"
+__version__ = "0.4.0"
diff --git a/plugins/nbconvert/fps_nbconvert/__init__.py b/plugins/nbconvert/fps_nbconvert/__init__.py
index 493f7415..6a9beea8 100644
--- a/plugins/nbconvert/fps_nbconvert/__init__.py
+++ b/plugins/nbconvert/fps_nbconvert/__init__.py
@@ -1 +1 @@
-__version__ = "0.3.0"
+__version__ = "0.4.0"
diff --git a/plugins/noauth/fps_noauth/__init__.py b/plugins/noauth/fps_noauth/__init__.py
index 493f7415..6a9beea8 100644
--- a/plugins/noauth/fps_noauth/__init__.py
+++ b/plugins/noauth/fps_noauth/__init__.py
@@ -1 +1 @@
-__version__ = "0.3.0"
+__version__ = "0.4.0"
diff --git a/plugins/resource_usage/fps_resource_usage/__init__.py b/plugins/resource_usage/fps_resource_usage/__init__.py
index 493f7415..6a9beea8 100644
--- a/plugins/resource_usage/fps_resource_usage/__init__.py
+++ b/plugins/resource_usage/fps_resource_usage/__init__.py
@@ -1 +1 @@
-__version__ = "0.3.0"
+__version__ = "0.4.0"
diff --git a/plugins/retrolab/fps_retrolab/__init__.py b/plugins/retrolab/fps_retrolab/__init__.py
index 493f7415..6a9beea8 100644
--- a/plugins/retrolab/fps_retrolab/__init__.py
+++ b/plugins/retrolab/fps_retrolab/__init__.py
@@ -1 +1 @@
-__version__ = "0.3.0"
+__version__ = "0.4.0"
diff --git a/plugins/terminals/fps_terminals/__init__.py b/plugins/terminals/fps_terminals/__init__.py
index 493f7415..6a9beea8 100644
--- a/plugins/terminals/fps_terminals/__init__.py
+++ b/plugins/terminals/fps_terminals/__init__.py
@@ -1 +1 @@
-__version__ = "0.3.0"
+__version__ = "0.4.0"
diff --git a/plugins/webdav/fps_webdav/__init__.py b/plugins/webdav/fps_webdav/__init__.py
index 493f7415..6a9beea8 100644
--- a/plugins/webdav/fps_webdav/__init__.py
+++ b/plugins/webdav/fps_webdav/__init__.py
@@ -1 +1 @@
-__version__ = "0.3.0"
+__version__ = "0.4.0"
diff --git a/plugins/yjs/fps_yjs/__init__.py b/plugins/yjs/fps_yjs/__init__.py
index 493f7415..6a9beea8 100644
--- a/plugins/yjs/fps_yjs/__init__.py
+++ b/plugins/yjs/fps_yjs/__init__.py
@@ -1 +1 @@
-__version__ = "0.3.0"
+__version__ = "0.4.0"