diff --git a/Gemfile b/Gemfile
index 4f4bd27..7ae1ba9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -32,7 +32,7 @@ group :test do
 end
 
 group :web, :development do
-  gem 'puma', '~> 3.10.0'
+  gem 'puma', '~> 3.12.3'
   gem 'sinatra', '~> 2.0.2', :require => 'sinatra/base'
   gem 'rack-protection', '~> 2.0.0'
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index f744730..5075598 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -82,8 +82,8 @@ GEM
       method_source (~> 0.8)
       slop (~> 3.4)
       spoon (~> 0.0)
-    puma (3.10.0)
-    puma (3.10.0-java)
+    puma (3.12.3)
+    puma (3.12.3-java)
     rack (2.0.6)
     rack-protection (2.0.4)
       rack
@@ -169,7 +169,7 @@ DEPENDENCIES
   foreman
   leanback (~> 0.5.14)
   pry
-  puma (~> 3.10.0)
+  puma (~> 3.12.3)
   rack (>= 2.0.6)
   rack-protection (~> 2.0.0)
   rack-test