diff --git a/CHANGES.md b/CHANGES.md
index 288d885c..bf700671 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -12,6 +12,13 @@ $ towncrier create <PR-number>.<break|feat|fix>.md --content "Short description"
 
 <!-- towncrier release notes start -->
 
+## cylc-uiserver-1.4.0 (Released 2023-09-12)
+
+### 🚀 Enhancements
+
+[#450](https://github.com/cylc/cylc-uiserver/pull/450) - Upgraded to Jupyter Server 2.7+ and Jupyter Hub 4.0+. Note cylc-uiserver 1.3 remains supported and compatible with cylc-flow 8.2 for those not ready to make the jump just yet.
+
+
 ## cylc-uiserver-1.3.1 (Released 2023-09-08)
 
 [Updated cylc-ui to 2.1.0](https://github.com/cylc/cylc-ui/blob/master/CHANGES.md)
diff --git a/changes.d/450.feat.md b/changes.d/450.feat.md
deleted file mode 100644
index 5962b4f9..00000000
--- a/changes.d/450.feat.md
+++ /dev/null
@@ -1 +0,0 @@
-Upgraded to Jupyter Server 2.7+ and Jupyter Hub 4.0+. Note cylc-uiserver 1.3 remains supported and compatible with cylc-flow 8.2 for those not ready to make the jump just yet.
diff --git a/cylc/uiserver/__init__.py b/cylc/uiserver/__init__.py
index 926d1d41..d59099aa 100644
--- a/cylc/uiserver/__init__.py
+++ b/cylc/uiserver/__init__.py
@@ -13,7 +13,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-__version__ = "1.4.0.dev"
+__version__ = "1.4.0"
 
 import os
 from typing import Dict