diff --git a/Gemfile b/Gemfile
index 560415f9..78ba0b00 100644
--- a/Gemfile
+++ b/Gemfile
@@ -20,6 +20,7 @@ gem 'combined_time_select'
 gem 'jekyll-timeago'
 
 gem "rails-html-sanitizer", "~> 1.6"
+gem 'tzinfo-data'
 
 # email parsing
 gem 'email_reply_trimmer'
diff --git a/Gemfile.lock b/Gemfile.lock
index 0935c087..fd96470b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -461,6 +461,8 @@ GEM
       sassc-rails (~> 2.1)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
+    tzinfo-data (1.2024.2)
+      tzinfo (>= 1.0.0)
     uglifier (4.2.0)
       execjs (>= 0.3.0, < 3)
     unf (0.1.4)
@@ -566,6 +568,7 @@ DEPENDENCIES
   tilt (~> 2.0, >= 2.0.10)
   turnstile-captcha
   twbs_sass_rails
+  tzinfo-data
   uglifier
   webdrivers (~> 5.0)
   webmock