diff --git a/Gemfile b/Gemfile
index 9bded8b15..90573940d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,6 @@
 source 'https://rubygems.org'
 
 ruby '>= 2.6.0', '< 3.3.0'
-gem 'bundler', '>= 1.12.0'
 
 gem 'rails', '6.1.7'
 gem 'rouge', '~> 3.30.0'
diff --git a/doc/INSTALL b/doc/INSTALL
index b38a829f7..103342b84 100644
--- a/doc/INSTALL
+++ b/doc/INSTALL
@@ -8,7 +8,6 @@ http://www.redmine.org/
 == Requirements
 
 * Ruby 2.6, 2.7, 3.0, 3.1
-* Bundler >= 1.12.0
 
 * A database:
   * MySQL (tested with MySQL 5.7)