diff --git a/openproject-meeting.gemspec b/openproject-meeting.gemspec
index c03b2b2301..80f05f340d 100644
--- a/openproject-meeting.gemspec
+++ b/openproject-meeting.gemspec
@@ -22,7 +22,7 @@ Gem::Specification.new do |s|
   s.files = Dir['{app,config,db,lib,doc}/**/*', 'README.md']
   s.test_files = Dir['spec/**/*']
 
-  s.add_dependency 'rails', '~> 4.2.4'
+  s.add_dependency 'rails', '~> 5.0.0'
   s.add_dependency 'icalendar', '~> 2.3.0'
 
   s.add_development_dependency 'factory_girl_rails', '~> 4.0'