diff --git a/Gemfile b/Gemfile
index 68bfa57..e54777c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -10,7 +10,7 @@ group :development, :test do
   gem "rubocop-rails_config"
 
   # dummy app
-  gem "puma", "~> 3.11"
+  gem "puma", "~> 5.6"
   gem "sqlite3"
   gem "slim-rails"
   gem "sassc-rails"
diff --git a/Gemfile.lock b/Gemfile.lock
index ec3ad70..b571f63 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -129,7 +129,8 @@ GEM
       ast (~> 2.4.0)
     powerpack (0.1.2)
     public_suffix (3.1.0)
-    puma (3.12.1)
+    puma (5.6.4)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-proxy (0.6.5)
       rack
@@ -257,7 +258,7 @@ DEPENDENCIES
   factory_bot_rails
   foreman
   protosite!
-  puma (~> 3.11)
+  puma (~> 5.6)
   rails (>= 5.2.1)
   rspec-graphql_matchers!
   rspec-rails