diff --git a/Gemfile b/Gemfile
index cbb3fe8..8f71730 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ gem 'rails', '~> 5.2.3'
 # Use sqlite3 as the database for Active Record
 gem 'mysql2'
 # 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 77fa749..d82f82f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -116,7 +116,7 @@ GEM
       mini_portile2 (~> 2.4.0)
     orm_adapter (0.5.0)
     public_suffix (4.0.3)
-    puma (3.12.2)
+    puma (3.12.4)
     rack (2.2.2)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -216,7 +216,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   mini_racer
   mysql2
-  puma (~> 3.11)
+  puma (~> 3.12)
   rails (~> 5.2.3)
   sass-rails (~> 5.0)
   selenium-webdriver