diff --git a/Gemfile b/Gemfile
index bcc58ee35..2dba4f77e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,7 @@
 source 'https://rubygems.org'
 
-ruby '>= 2.3.0', '< 2.7.0' if Bundler::VERSION >= '1.12.0'
-gem "bundler", ">= 1.5.0"
+ruby '>= 2.3.0', '< 2.7.0'
+gem 'bundler', '>= 1.12.0'
 
 gem "rails", "5.2.4.1"
 gem 'sprockets', '~> 3.7.2' if RUBY_VERSION < '2.5'
diff --git a/doc/INSTALL b/doc/INSTALL
index 49dd6e285..0c57edb39 100644
--- a/doc/INSTALL
+++ b/doc/INSTALL
@@ -8,7 +8,7 @@ http://www.redmine.org/
 == Requirements
 
 * Ruby 2.3, 2.4, 2.5, 2.6
-* Bundler >= 1.5.0
+* Bundler >= 1.12.0
 
 * A database:
   * MySQL (tested with MySQL 5.7)