diff --git a/ruby_rails/Gemfile b/ruby_rails/Gemfile
index d22ca1d..1ee09f6 100644
--- a/ruby_rails/Gemfile
+++ b/ruby_rails/Gemfile
@@ -13,7 +13,7 @@ gem "sprockets-rails"
 gem "mysql2", "~> 0.5"
 
 # Use the Puma web server [https://github.com/puma/puma]
-gem "puma", "~> 5.0"
+gem "puma", "~> 5.6"
 
 # Use JavaScript with ESM import maps [https://github.com/rails/importmap-rails]
 gem "importmap-rails"
diff --git a/ruby_rails/Gemfile.lock b/ruby_rails/Gemfile.lock
index 3e469bf..75d8224 100644
--- a/ruby_rails/Gemfile.lock
+++ b/ruby_rails/Gemfile.lock
@@ -123,13 +123,15 @@ GEM
     net-smtp (0.3.3)
       net-protocol
     netrc (0.11.0)
-    nio4r (2.5.9)
+    nio4r (2.7.0)
     nokogiri (1.15.4-arm64-darwin)
       racc (~> 1.4)
+    nokogiri (1.15.4-x86_64-linux)
+      racc (~> 1.4)
     omise (0.10.1)
       json (>= 1.8)
       rest-client (>= 2.0)
-    puma (5.6.7)
+    puma (5.6.8)
       nio4r (~> 2.0)
     racc (1.7.1)
     rack (2.2.8)
@@ -205,6 +207,7 @@ GEM
 PLATFORMS
   arm64-darwin-22
   arm64-darwin-23
+  x86_64-linux
 
 DEPENDENCIES
   bootsnap
@@ -213,7 +216,7 @@ DEPENDENCIES
   jbuilder
   mysql2 (~> 0.5)
   omise
-  puma (~> 5.0)
+  puma (~> 5.6)
   rails (~> 7.0.7, >= 7.0.7.2)
   securerandom
   sprockets-rails