diff --git a/openproject-reporting.gemspec b/openproject-reporting.gemspec
index 24647ba118..8950e78cc2 100644
--- a/openproject-reporting.gemspec
+++ b/openproject-reporting.gemspec
@@ -16,7 +16,7 @@ Gem::Specification.new do |s|
   s.files = Dir["{app,config,db,lib,doc}/**/*", "README.md"]
   s.test_files = Dir["spec/**/*"]
 
-  s.add_dependency 'rails', '~> 4.1.11'
+  s.add_dependency 'rails', '~> 4.2.4'
   
   s.add_dependency "reporting_engine", ">= 1.1.0"
   s.add_dependency "openproject-costs", ">= 4.0.0"
diff --git a/spec/requests/custom_field_cache_spec.rb b/spec/requests/custom_field_cache_spec.rb
index 4b822fc24d..2540f6c1f8 100644
--- a/spec/requests/custom_field_cache_spec.rb
+++ b/spec/requests/custom_field_cache_spec.rb
@@ -59,7 +59,7 @@ describe 'Custom field filter and group by caching', type: :request do
   end
 
   def visit_cost_reports_index
-    get "projects/#{project.id}/cost_reports"
+    get "/projects/#{project.id}/cost_reports"
   end
 
   it 'removes the filter/group_by if the custom field is removed' do