diff --git a/Gemfile b/Gemfile
index 57452a408..b2ff75d11 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,7 +5,7 @@ ruby File.read('.ruby-version').chomp
 gem 'redcarpet'
 
 group :web do
-  gem 'puma', '~> 4.3.5'
+  gem 'puma', '~> 5.6.4'
   gem 'sinatra'
   gem 'sinatra-contrib'
   gem 'rack-cors'
diff --git a/Gemfile.lock b/Gemfile.lock
index 4c8e76001..4f481ab7d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -66,13 +66,13 @@ GEM
     multipart-post (2.1.1)
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
-    nio4r (2.5.2)
+    nio4r (2.5.8)
     oj (3.7.12)
     parslet (1.8.2)
     protocol (2.0.0)
       ruby_parser (~> 3.0)
     public_suffix (3.0.3)
-    puma (4.3.5)
+    puma (5.6.4)
       nio4r (~> 2.0)
     rack (2.2.3)
     rack-cors (1.1.1)
@@ -139,7 +139,7 @@ PLATFORMS
 DEPENDENCIES
   dpl!
   json-schema
-  puma (~> 4.3.5)
+  puma (~> 5.6.4)
   rack-cors
   rack-ssl-enforcer (~> 0.2.9)
   rack-test