diff --git a/Gemfile b/Gemfile
index 039c3bb..98a162e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 5.2.2'
 # 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 ea52734..87eebcb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -174,7 +174,7 @@ GEM
     polyamorous (2.3.0)
       activerecord (>= 5.0)
     public_suffix (4.0.1)
-    puma (3.12.1)
+    puma (3.12.3)
     rack (2.0.8)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -323,7 +323,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   mini_magick (= 4.7.0)
   pg (>= 0.18, < 2.0)
-  puma (~> 3.11)
+  puma (~> 3.12)
   rails (~> 5.2.2)
   rails-i18n (~> 5.1)
   ransack