diff --git a/.github/workflows/rubyonrails.yml b/.github/workflows/rubyonrails.yml
index b7fc0fa6..c701e6b0 100644
--- a/.github/workflows/rubyonrails.yml
+++ b/.github/workflows/rubyonrails.yml
@@ -20,9 +20,9 @@
 name: "GitHub CI"
 on:
   push:
-    branches: ["master"]
+    branches: ["devel"]
   pull_request:
-    branches: ["master"]
+    branches: ["devel"]
 jobs:
   plugin_tests:
     strategy:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9e914f02..7297f37f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,9 @@
 Changelog for Redmine DMSF
 ==========================
 
+4.2.1 *????-??-??*
+------------------
+
 4.2.0 *2025-07-04*
 ------------------
 
diff --git a/README.md b/README.md
index 57c71b65..41ff394e 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# Redmine DMSF Plugin 4.2.0
+# Redmine DMSF Plugin 4.2.1 devel
 
 [![GitHub CI](https://github.com/picman/redmine_dmsf/actions/workflows/rubyonrails.yml/badge.svg?branch=master)](https://github.com/picman/redmine_dmsf/actions/workflows/rubyonrails.yml)
 [![Support Ukraine Badge](https://bit.ly/support-ukraine-now)](https://github.com/support-ukraine/support-ukraine)
diff --git a/init.rb b/init.rb
index b167de33..ebc1a3e0 100644
--- a/init.rb
+++ b/init.rb
@@ -27,7 +27,7 @@ Redmine::Plugin.register :redmine_dmsf do
   author_url 'https://github.com/picman/redmine_dmsf/graphs/contributors'
   author 'Vít Jonáš / Daniel Munn / Karel Pičman'
   description 'Document Management System Features'
-  version '4.2.0'
+  version '4.2.1 devel'
 
   requires_redmine version_or_higher: '6.0.0'