diff --git a/config/application.rb b/config/application.rb
index 1905b45..4316f1a 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -81,6 +81,7 @@ module RedmineApp
       :cookie_store,
       :key => '_redmine_session',
       :path => config.relative_url_root || '/',
+      :secure => true,
       :same_site => :lax
     )