diff --git a/README.md b/README.md
index 2eaf81f..0b93cba 100644
--- a/README.md
+++ b/README.md
@@ -606,7 +606,7 @@ the `publish` confirmation value.
 
 ## Changelog
 
-### Unreleased
+### v0.4.0
 - Add `client.audio`: `speech.create()` (binary audio with `write_to_file()`),
   `transcriptions.create()` and `translations.create()` (multipart uploads).
 - Add `stream`, `thinking` and `extra_body` to `messages.create()`, with typed stream
diff --git a/apertis/__init__.py b/apertis/__init__.py
index 95cd9e0..9352e57 100644
--- a/apertis/__init__.py
+++ b/apertis/__init__.py
@@ -83,7 +83,7 @@
     Usage,
 )
 
-__version__ = "0.3.0"
+__version__ = "0.4.0"
 
 __all__ = [
     # Clients
diff --git a/pyproject.toml b/pyproject.toml
index cd700d5..fd609b8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "apertis"
-version = "0.3.0"
+version = "0.4.0"
 description = "Official Python SDK for Apertis AI API"
 readme = "README.md"
 license = "Apache-2.0"