From 771b443873994e2c5b69ecf44415eec6acd1c441 Mon Sep 17 00:00:00 2001
From: ishikawa999 <14245262+ishikawa999@users.noreply.github.com>
Date: Thu, 22 Jan 2026 08:08:40 +0000
Subject: [PATCH] Add Ruby 4.0 to supported Ruby versions

---
 .github/workflows/tests.yml | 4 ++--
 Gemfile                     | 3 ++-
 doc/INSTALL                 | 2 +-
 3 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index e980899d6..53b9a180c 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -10,7 +10,7 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ['3.2', '3.3', '3.4']
+        ruby: ['3.2', '3.3', '3.4', '4.0']
         db: ['postgresql', 'mysql2', 'sqlite3']
       fail-fast: false
 
@@ -79,7 +79,7 @@ jobs:
         uses: ./.github/actions/setup-redmine
         with:
           db-type: sqlite3
-          ruby-version: '3.4'
+          ruby-version: '4.0'
 
       # System tests use Chrome and ChromeDriver installed on the GitHub Actions Ubuntu image.
       # They are generally updated to the latest stable versions.
diff --git a/Gemfile b/Gemfile
index 06ff99259..4efa77475 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-ruby '>= 3.2.0', '< 3.5.0'
+ruby '>= 3.2.0', '< 4.1.0'
 
 gem 'rails', '8.1.2'
 gem 'rouge', '~> 4.5'
@@ -29,6 +29,7 @@ gem 'csv', '~> 3.3.2'
 gem 'net-imap', '~> 0.5.7'
 gem 'net-pop', '~> 0.1.2'
 gem 'net-smtp', '~> 0.5.0'
+gem 'ostruct', '~> 0.6.3'
 
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
 gem 'tzinfo-data', platforms: [:mingw, :x64_mingw, :mswin]
diff --git a/doc/INSTALL b/doc/INSTALL
index c381d1a86..6d70f683a 100644
--- a/doc/INSTALL
+++ b/doc/INSTALL
@@ -7,7 +7,7 @@ https://www.redmine.org/
 
 == Requirements
 
-* Ruby 3.2, 3.3, 3.4
+* Ruby 3.2, 3.3, 3.4, 4,0
 
 * A database:
   * MySQL (tested with MySQL 8)
-- 
2.52.0