diff --git a/Gemfile b/Gemfile
index 908c32343..d5870ad95 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,6 +3,7 @@ source 'https://rubygems.org'
 ruby '>= 2.7.0', '< 3.3.0'
 
 gem 'rails', '7.1.2'
+gem 'rack-session', '~> 1.0'
 gem 'rouge', '~> 4.2.0'
 gem 'mini_mime', '~> 1.1.0'
 gem "actionpack-xml_parser"