diff --git a/Gemfile b/Gemfile
index 8991d1d..08f4d24 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 5.2.0'
 # 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/Gemfile.lock b/Gemfile.lock
index 8cdad23..d5fa6a5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -119,7 +119,7 @@ GEM
       mini_portile2 (~> 2.3.0)
     pg (1.0.0)
     public_suffix (3.0.2)
-    puma (3.11.4)
+    puma (3.12.4)
     rack (2.0.5)
     rack-protection (2.0.3)
       rack
@@ -225,7 +225,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   mini_racer
   pg (>= 0.18, < 2.0)
-  puma (~> 3.11)
+  puma (~> 3.12)
   rails (~> 5.2.0)
   redis (~> 4.0)
   sass-rails (~> 5.0)