diff --git a/Gemfile b/Gemfile
index 0d9dc59..54f03b0 100644
--- a/Gemfile
+++ b/Gemfile
@@ -12,7 +12,7 @@ gem 'rails', '~> 5.1.4'
 # Use postgresql as the database for Active Record
 gem 'pg', '~> 0.18'
 # Use Puma as the app server
-gem 'puma', '~> 3.7'
+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 8cd6d5c..0eb16f0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -99,7 +99,7 @@ GEM
       mini_portile2 (~> 2.3.0)
     pg (0.21.0)
     public_suffix (3.0.0)
-    puma (3.10.0)
+    puma (3.12.6)
     rack (2.0.3)
     rack-test (0.7.0)
       rack (>= 1.0, < 3)
@@ -191,7 +191,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   materialize-sass
   pg (~> 0.18)
-  puma (~> 3.7)
+  puma (~> 3.12)
   rails (~> 5.1.4)
   sass-rails (~> 5.0)
   selenium-webdriver