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diff --git a/docs/conf.py b/docs/conf.py
index 64221e1..e77a084 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -25,7 +25,7 @@
 project_name_full = 'Data Stewardship Wizard'
 
 # The full version, including alpha/beta/rc tags
-version = release = '4.26'
+version = release = '4.27'
 
 rst_prolog = f"""
 
diff --git a/docs/more/self-hosted-dsw/upgrade-guidelines.rst b/docs/more/self-hosted-dsw/upgrade-guidelines.rst
index 4624d86..e7c7e71 100644
--- a/docs/more/self-hosted-dsw/upgrade-guidelines.rst
+++ b/docs/more/self-hosted-dsw/upgrade-guidelines.rst
@@ -45,6 +45,13 @@ Usually, nothing special is required for the upgrade. Internal structure changes
    
    Make sure to stop ``document-worker`` and ``mailer`` before upgrading to the next version. Run ``wizard-server`` first, then run the workers. Otherwise the database migrations might not work correctly.
 
+
+4.26.X to 4.27.X
+----------------
+
+- API endpoints in the sections related to Locales were updated. The primary identifier was changed from ID to UUID. Please check the API documentation for the new endpoints.
+- Due to the locale changes, it is necessary to migrate the locales in S3. You can use this script: https://github.com/ds-wizard/dsw-locale-migration-script
+
 4.25.X to 4.26.X
 ----------------