diff --git a/Gemfile b/Gemfile
index 686dac08..5c79b4bc 100644
--- a/Gemfile
+++ b/Gemfile
@@ -28,7 +28,7 @@ end
 # Windows and JRuby does not include zoneinfo files, so bundle the tzinfo-data gem
 # and associated library.
 install_if -> { RUBY_PLATFORM =~ %r!mingw|mswin|java! } do
-  gem "tzinfo", "~> 1.2"
+  gem "tzinfo", "~> 2.0"
   gem "tzinfo-data"
 end
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 5c3337e9..323ab5b4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -123,11 +123,10 @@ GEM
       tilt (>= 1.3, < 3)
     terminal-table (2.0.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
-    thread_safe (0.3.6)
     tilt (2.0.10)
     trollop (2.9.9)
-    tzinfo (1.2.9)
-      thread_safe (~> 0.1)
+    tzinfo (2.0.4)
+      concurrent-ruby (~> 1.0)
     tzinfo-data (1.2021.5)
       tzinfo (>= 1.0.0)
     unicode-display_width (1.8.0)
@@ -151,7 +150,7 @@ DEPENDENCIES
   puma
   rack
   rack-jekyll
-  tzinfo (~> 1.2)
+  tzinfo (~> 2.0)
   tzinfo-data
   wdm (~> 0.1.1)
   webrick (~> 1.7)