diff --git a/Gemfile b/Gemfile
index 11a676cf..d60e9f8b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ ruby '3.0.2'
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '~> 6.1.4.1'
 # Use Puma as the app server
-gem 'puma', '~> 5.4.0'
+gem 'puma', '~> 5.6.4'
 # Use SCSS for stylesheets
 gem 'sassc-rails'
 gem 'normalize-rails'
diff --git a/Gemfile.lock b/Gemfile.lock
index 4712e2be..427c0789 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -227,6 +227,8 @@ GEM
     nio4r (2.5.8)
     nokogiri (1.12.4-x86_64-darwin)
       racc (~> 1.4)
+    nokogiri (1.12.4-x86_64-linux)
+      racc (~> 1.4)
     normalize-rails (8.0.1)
     notiffany (0.1.3)
       nenv (~> 0.1)
@@ -245,7 +247,7 @@ GEM
       binding_of_caller (~> 1.0)
       pry (~> 0.13)
     public_suffix (4.0.6)
-    puma (5.4.0)
+    puma (5.6.4)
       nio4r (~> 2.0)
     racc (1.5.2)
     rack (2.2.3)
@@ -421,6 +423,7 @@ GEM
 
 PLATFORMS
   x86_64-darwin-20
+  x86_64-linux
 
 DEPENDENCIES
   aws-ses (~> 0.7.1)
@@ -458,7 +461,7 @@ DEPENDENCIES
   pry (~> 0.14.1)
   pry-remote
   pry-stack_explorer
-  puma (~> 5.4.0)
+  puma (~> 5.6.4)
   rack-cors
   rack-livereload
   rack-mini-profiler