diff --git a/Gemfile b/Gemfile
index fad984f..25c41ce 100644
--- a/Gemfile
+++ b/Gemfile
@@ -26,7 +26,7 @@ end
 # Windows 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 e9f40f4..ff7a135 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -91,10 +91,8 @@ GEM
       faraday (> 0.8, < 2.0)
     terminal-table (1.8.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
-    thread_safe (0.3.6)
-    thread_safe (0.3.6-java)
-    tzinfo (1.2.7)
-      thread_safe (~> 0.1)
+    tzinfo (2.0.4)
+      concurrent-ruby (~> 1.0)
     tzinfo-data (1.2021.1)
       tzinfo (>= 1.0.0)
     unicode-display_width (1.7.0)
@@ -109,7 +107,7 @@ DEPENDENCIES
   jekyll-asciidoc
   jekyll-feed (~> 0.6)
   minimal-mistakes-jekyll
-  tzinfo (~> 1.2)
+  tzinfo (~> 2.0)
   tzinfo-data
 
 BUNDLED WITH