diff --git a/Gemfile.lock b/Gemfile.lock
index 847d866..eebd5cb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,6 +8,7 @@ PATH
       os (>= 1.1, < 2.0)
       thor (>= 1.2, < 2.0)
       thor_nested_subcommand (>= 1.0, < 2.0)
+      tzinfo-data (~> 1.2024, >= 1.2024.1)
 
 GEM
   remote: https://rubygems.org/
@@ -149,6 +150,8 @@ GEM
     thor_nested_subcommand (1.0.8)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
+    tzinfo-data (1.2024.1)
+      tzinfo (>= 1.0.0)
     unicode-display_width (2.5.0)
     zeitwerk (2.6.14)
 
diff --git a/dsu.gemspec b/dsu.gemspec
index b7023ed..47802a8 100644
--- a/dsu.gemspec
+++ b/dsu.gemspec
@@ -44,6 +44,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'os', '>= 1.1', '< 2.0'
   spec.add_dependency 'thor', '>= 1.2', '< 2.0'
   spec.add_dependency 'thor_nested_subcommand', '>= 1.0', '< 2.0'
+  spec.add_dependency 'tzinfo-data', '~> 1.2024', '>= 1.2024.1'
 
   spec.metadata['rubygems_mfa_required'] = 'true'