diff --git a/openproject-pdf_export.gemspec b/openproject-pdf_export.gemspec
index 8b630d7ff5..682b5cd5d0 100644
--- a/openproject-pdf_export.gemspec
+++ b/openproject-pdf_export.gemspec
@@ -15,7 +15,7 @@ Gem::Specification.new do |s|
 
   s.files = Dir["{app,config,db,lib,doc}/**/*", "README.md"]
 
-  s.add_dependency 'rails', '~> 4.2.4'
+  s.add_dependency 'rails', '~> 5.0.0'
 
   s.add_dependency "prawn", "~> 2.1.0"