diff --git a/Gemfile b/Gemfile
index d305fd1..fc82f1b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -10,7 +10,7 @@ gem 'rails', '~> 6.0.0'
 gem 'sqlite3', '~> 1.4'
 
 # Use Puma as the app server
-gem 'puma', '~> 4.3'
+gem 'puma', '~> 5.6'
 
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
 # gem 'jbuilder', '~> 2.7'
diff --git a/Gemfile.lock b/Gemfile.lock
index 6a789e5..0e933fe 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -121,7 +121,7 @@ GEM
     msgpack (1.4.2)
     multi_xml (0.6.0)
     multipart-post (2.1.1)
-    nio4r (2.5.8)
+    nio4r (2.5.9)
     nokogiri (1.13.10-x86_64-darwin)
       racc (~> 1.4)
     nokogiri (1.13.10-x86_64-linux)
@@ -164,7 +164,7 @@ GEM
       rubocop (>= 0.49.1, < 1.0)
     psych (3.3.0)
     public_suffix (4.0.6)
-    puma (4.3.12)
+    puma (5.6.7)
       nio4r (~> 2.0)
     racc (1.6.1)
     rack (2.2.6.4)
@@ -310,7 +310,7 @@ DEPENDENCIES
   pronto-poper
   pronto-reek
   pronto-rubocop
-  puma (~> 4.3)
+  puma (~> 5.6)
   rack-attack (~> 5.0, >= 5.0.1)
   rack-cors
   rails (~> 6.0.0)