diff --git a/Gemfile b/Gemfile
index 6b03f310..21d99d61 100644
--- a/Gemfile
+++ b/Gemfile
@@ -31,7 +31,7 @@ group :test do
 end
 
 group :web, :development do
-  gem 'puma', '~> 3.12.2'
+  gem 'puma', '~> 3.12.4'
   gem 'sinatra', '~> 2.0.2', :require => 'sinatra/base'
   gem 'rack-protection', '~> 2.0.0'
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index 3b6360bc..b4619cfc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -73,8 +73,8 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
       spoon (~> 0.0)
-    puma (3.12.2)
-    puma (3.12.2-java)
+    puma (3.12.4)
+    puma (3.12.4-java)
     rack (2.0.8)
     rack-protection (2.0.7)
       rack
@@ -134,7 +134,7 @@ DEPENDENCIES
   leanback (~> 0.5.14)
   nokogiri (~> 1.10.4)
   pry
-  puma (~> 3.12.2)
+  puma (~> 3.12.4)
   rack (~> 2.0.6)
   rack-protection (~> 2.0.0)
   rack-test