diff --git a/CHANGELOG.md b/CHANGELOG.md
index 67e97135..bb255427 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,11 +1,20 @@
 # Changelog
 
+## [v3.10.0](https://github.com/DFE-Digital/dfe-reference-data/tree/v3.10.0) (2026-08-05)
+
+[Full Changelog](https://github.com/DFE-Digital/dfe-reference-data/compare/v3.9.0...v3.10.0)
+
+**Merged pull requests:**
+
+- Add new version of countries data. [\#166](https://github.com/DFE-Digital/dfe-reference-data/pull/166) ([mysteryGarlicPress](https://github.com/mysteryGarlicPress))
+
 ## [v3.9.0](https://github.com/DFE-Digital/dfe-reference-data/tree/v3.9.0) (2026-07-01)
 
 [Full Changelog](https://github.com/DFE-Digital/dfe-reference-data/compare/v3.8.6...v3.9.0)
 
 **Merged pull requests:**
 
+- v3.9.0 release for bank holidays automation and change [\#169](https://github.com/DFE-Digital/dfe-reference-data/pull/169) ([mysteryGarlicPress](https://github.com/mysteryGarlicPress))
 - Update bank holidays [\#168](https://github.com/DFE-Digital/dfe-reference-data/pull/168) ([github-actions[bot]](https://github.com/apps/github-actions))
 - Automatically add bank holidays from GOV.UK to reference data [\#165](https://github.com/DFE-Digital/dfe-reference-data/pull/165) ([mysteryGarlicPress](https://github.com/mysteryGarlicPress))
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 8b3b899b..f4f65dbd 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    dfe-reference-data (3.9.0)
+    dfe-reference-data (3.10.0)
       activesupport
       csv
       tzinfo
diff --git a/lib/dfe/reference_data/version.rb b/lib/dfe/reference_data/version.rb
index c0cc6adb..06512089 100644
--- a/lib/dfe/reference_data/version.rb
+++ b/lib/dfe/reference_data/version.rb
@@ -1,5 +1,5 @@
 module DfE
   module ReferenceData
-    VERSION = '3.9.0'.freeze
+    VERSION = '3.10.0'.freeze
   end
 end