diff --git a/Gemfile b/Gemfile
index b4acb50..0709f01 100644
--- a/Gemfile
+++ b/Gemfile
@@ -10,7 +10,7 @@ gem 'rails', '~> 5.1.3'
 # 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 b25add0..8977c11 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -347,7 +347,7 @@ GEM
     pg (0.21.0)
     popper_js (1.14.5)
     public_suffix (3.0.3)
-    puma (3.12.0)
+    puma (3.12.3)
     rack (2.0.6)
     rack-protection (2.0.5)
       rack
@@ -516,7 +516,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   material_icons
   pg (~> 0.18)
-  puma (~> 3.7)
+  puma (~> 3.12)
   rails (~> 5.1.3)
   rails-controller-testing
   rb-readline