diff --git a/docs/source/conf.py b/docs/source/conf.py
index e3a76c0d..0b579b80 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -61,8 +61,8 @@
 author = 'matrix.org'
 
 
-version = '0.4.0-dev'
-release = '0.4.0-dev'
+version = '0.4.0'
+release = '0.4.0'
 
 language = None
 
diff --git a/matrix_client/__init__.py b/matrix_client/__init__.py
index 78009980..7b18c407 100644
--- a/matrix_client/__init__.py
+++ b/matrix_client/__init__.py
@@ -13,4 +13,4 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-__version__ = "0.4.0-dev"
+__version__ = "0.4.0"