diff --git a/Gemfile b/Gemfile
index 0c3aa95a..82780a41 100644
--- a/Gemfile
+++ b/Gemfile
@@ -145,6 +145,10 @@ gem 'prawn-rails'
 # see https://github.com/prawnpdf/prawn/commit/3658d5125c3b20eb11484c3b039ca6b89dc7d1b7
 gem 'matrix', '~> 0.4'
 
+# FIXME: for selenium-webdriver, rexml isn't in the default set of Ruby 3.1 anymore
+# see https://github.com/SeleniumHQ/selenium/commit/526fd9d0de60a53746ffa982feab985fed09a278
+gem 'rexml'
+
 # for QR code generation
 gem 'rqrcode'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index d7128131..d413e46c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -727,6 +727,7 @@ DEPENDENCIES
   recaptcha
   redcarpet
   responders (~> 3.0)
+  rexml
   rolify
   rqrcode
   rspec-activemodel-mocks