diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8c8c359..17e4e10 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,27 @@
 # Changelog
 
+## 0.4.0 - March 4, 2023
+
+### 🚀 New
+
+* Add suport for spectrograph 3.
+* Support Python 3.11.
+
+### ✨ Improved
+
+* Use `$OBSERVATORY` as spreadsheet location and use different spreadsheets for each spectrograph.
+* Support specifying the `lvmieb` actor name. This is useful when `lvmscp` and `lvmieb` are deployed in multiple instances, one per spectrograph.
+
+### 🏷️ Changed
+
+* Use unbined flushing during idle.
+
+### ⚙️ Engineering
+
+* Use `python:3.11-slim-bullseye` base image for Docker image.
+* Allow to set the configuration file to use using `$LVMSCP_CONFIG_FILE`.
+
+
 ## 0.3.0 - May 28, 2022
 
 ### 🔥 Breaking changes
diff --git a/poetry.lock b/poetry.lock
index e1a592b..ab1b1f7 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1554,14 +1554,14 @@ files = [
 
 [[package]]
 name = "platformdirs"
-version = "3.0.0"
+version = "3.1.0"
 description = "A small Python package for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
 category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "platformdirs-3.0.0-py3-none-any.whl", hash = "sha256:b1d5eb14f221506f50d6604a561f4c5786d9e80355219694a1b244bcd96f4567"},
-    {file = "platformdirs-3.0.0.tar.gz", hash = "sha256:8a1228abb1ef82d788f74139988b137e78692984ec7b08eaa6c65f1723af28f9"},
+    {file = "platformdirs-3.1.0-py3-none-any.whl", hash = "sha256:13b08a53ed71021350c9e300d4ea8668438fb0046ab3937ac9a29913a1a1350a"},
+    {file = "platformdirs-3.1.0.tar.gz", hash = "sha256:accc3665857288317f32c7bebb5a8e482ba717b474f3fc1d18ca7f9214be0cef"},
 ]
 
 [package.extras]
@@ -1842,14 +1842,14 @@ files = [
 
 [[package]]
 name = "pytest"
-version = "7.2.1"
+version = "7.2.2"
 description = "pytest: simple powerful testing with Python"
 category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "pytest-7.2.1-py3-none-any.whl", hash = "sha256:c7c6ca206e93355074ae32f7403e8ea12163b1163c976fee7d4d84027c162be5"},
-    {file = "pytest-7.2.1.tar.gz", hash = "sha256:d45e0952f3727241918b8fd0f376f5ff6b301cc0777c6f9a556935c92d8a7d42"},
+    {file = "pytest-7.2.2-py3-none-any.whl", hash = "sha256:130328f552dcfac0b1cec75c12e3f005619dc5f874f0a06e8ff7263f0ee6225e"},
+    {file = "pytest-7.2.2.tar.gz", hash = "sha256:c99ab0c73aceb050f68929bc93af19ab6db0558791c6a0715723abe9d0ade9d4"},
 ]
 
 [package.dependencies]
diff --git a/pyproject.toml b/pyproject.toml
index 965b767..cb7a3fd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "sdss-lvmscp"
-version = "0.4.0a0"
+version = "0.4.0"
 description = "LVM spectrograph control package."
 authors = ["José Sánchez-Gallego <gallegoj@uw.edu>", "Changgon Kim <changgonkim@khu.ac.kr>"]
 maintainers = ["José Sánchez-Gallego <gallegoj@uw.edu>"]