diff --git a/Gemfile b/Gemfile
index c3499d6..76aacbd 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,7 +9,7 @@ gem "activemodel", RAILS_GEMS_VERSION
 gem "activesupport", RAILS_GEMS_VERSION
 gem "railties", RAILS_GEMS_VERSION
 
-gem "puma", "~> 5.0"
+gem "puma", "~> 6.3"
 
 group :test do
   gem "simplecov", require: false
diff --git a/Gemfile.lock b/Gemfile.lock
index d3ee68e..e8fa33e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -72,7 +72,7 @@ GEM
       ast (~> 2.4.1)
       racc
     public_suffix (5.0.3)
-    puma (5.6.7)
+    puma (6.3.1)
       nio4r (~> 2.0)
     racc (1.7.1)
     rack (2.2.8)
@@ -180,7 +180,7 @@ DEPENDENCIES
   brakeman
   debug
   govuk_test
-  puma (~> 5.0)
+  puma (~> 6.3)
   railties (= 7.0.7.2)
   rspec-rails
   rubocop-govuk