diff --git a/Gemfile b/Gemfile
index 73ff0fd1..7fce22cb 100644
--- a/Gemfile
+++ b/Gemfile
@@ -10,7 +10,7 @@ gem "foreman"
 gem "jbuilder"
 gem "okcomputer"
 gem "pg", "~> 1.5"
-gem "puma", "~> 6.3"
+gem "puma", "~> 6.4"
 gem "rails", "~> 7.0.8"
 gem "sprockets-rails"
 gem "tzinfo-data", platforms: %i[mingw mswin x64_mingw jruby]
diff --git a/Gemfile.lock b/Gemfile.lock
index 893af07c..9651edb9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -275,7 +275,7 @@ GEM
       byebug (~> 11.0)
       pry (>= 0.13, < 0.15)
     public_suffix (5.0.1)
-    puma (6.3.1)
+    puma (6.4.0)
       nio4r (~> 2.0)
     raabro (1.4.0)
     racc (1.7.1)
@@ -478,7 +478,7 @@ DEPENDENCIES
   pg (~> 1.5)
   phonelib
   pry-byebug
-  puma (~> 6.3)
+  puma (~> 6.4)
   rails (~> 7.0.8)
   rspec-rails
   rubocop-govuk