diff --git a/Gemfile b/Gemfile
index aad9794..601da59 100644
--- a/Gemfile
+++ b/Gemfile
@@ -12,7 +12,7 @@ gem 'kaminari'
 # 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 e94191d..87926e0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -148,7 +148,7 @@ GEM
     pry-rails (0.3.6)
       pry (>= 0.10.4)
     public_suffix (3.0.1)
-    puma (3.11.0)
+    puma (3.12.4)
     rack (2.0.3)
     rack-test (0.8.2)
       rack (>= 1.0, < 3)
@@ -245,7 +245,7 @@ DEPENDENCIES
   paperclip
   pg (~> 0.18)
   pry-rails
-  puma (~> 3.7)
+  puma (~> 3.12)
   rails (~> 5.1.4)
   sass-rails (~> 5.0)
   selenium-webdriver