diff --git a/test_app/Gemfile b/test_app/Gemfile
index 3dcb93f..c7fab6c 100644
--- a/test_app/Gemfile
+++ b/test_app/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 5.2.3'
 # Use postgresql as the database for Active Record
 gem 'pg', '>= 0.18', '< 2.0'
 # Use Puma as the app server
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 3.12'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
 # Use Uglifier as compressor for JavaScript assets
diff --git a/test_app/Gemfile.lock b/test_app/Gemfile.lock
index af97f1f..d8f9468 100644
--- a/test_app/Gemfile.lock
+++ b/test_app/Gemfile.lock
@@ -111,7 +111,7 @@ GEM
       mini_portile2 (~> 2.4.0)
     pg (1.1.4)
     public_suffix (3.1.1)
-    puma (3.12.1)
+    puma (3.12.4)
     rack (2.0.7)
     rack-proxy (0.6.5)
       rack
@@ -216,7 +216,7 @@ DEPENDENCIES
   jbuilder (~> 2.5)
   listen (>= 3.0.5, < 3.2)
   pg (>= 0.18, < 2.0)
-  puma (~> 3.11)
+  puma (~> 3.12)
   rails (~> 5.2.3)
   react-rails
   sass-rails (~> 5.0)