diff --git a/Gemfile b/Gemfile
index da8db4609..f7b396238 100644
--- a/Gemfile
+++ b/Gemfile
@@ -12,7 +12,7 @@ gem 'faker',                      '2.11.0'
 gem 'will_paginate',              '3.3.0'
 gem 'bootstrap-will_paginate',    '1.0.0'
 gem 'bootstrap-sass',             '3.4.1'
-gem 'puma',                       '5.3.1'
+gem 'puma',                       '5.6.4'
 gem 'sass-rails',                 '6.0.0'
 gem 'webpacker',                  '5.4.0'
 gem 'turbolinks',                 '5.2.1'
diff --git a/Gemfile.lock b/Gemfile.lock
index 0a8fc3de8..5ddb9eeb8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -159,6 +159,8 @@ GEM
     nio4r (2.5.8)
     nokogiri (1.13.6-x86_64-darwin)
       racc (~> 1.4)
+    nokogiri (1.13.6-x86_64-linux)
+      racc (~> 1.4)
     notiffany (0.1.3)
       nenv (~> 0.1)
       shellany (~> 0.0)
@@ -167,7 +169,7 @@ GEM
       coderay (~> 1.1)
       method_source (~> 1.0)
     public_suffix (4.0.7)
-    puma (5.3.1)
+    puma (5.6.4)
       nio4r (~> 2.0)
     racc (1.6.0)
     rack (2.2.3)
@@ -271,6 +273,7 @@ GEM
 
 PLATFORMS
   x86_64-darwin-19
+  x86_64-linux
 
 DEPENDENCIES
   active_storage_validations (= 0.8.9)
@@ -291,7 +294,7 @@ DEPENDENCIES
   minitest (= 5.11.3)
   minitest-reporters (= 1.3.8)
   pg (= 1.2.3)
-  puma (= 5.3.1)
+  puma (= 5.6.4)
   rack-mini-profiler (= 2.3.1)
   rails (= 6.1.4.6)
   rails-controller-testing (= 1.0.5)