diff --git a/Gemfile b/Gemfile
index a12fab7..db7f3be 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 5.2.0'
 # Use MySQL as the database for Active Record
 gem 'mysql2', '~> 0.5.1'
 # 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 e0b5cc8..9c6c4a4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -146,7 +146,7 @@ GEM
     orm_adapter (0.5.0)
     popper_js (1.14.5)
     public_suffix (3.0.3)
-    puma (3.12.0)
+    puma (3.12.6)
     rack (2.0.6)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -258,7 +258,7 @@ DEPENDENCIES
   jquery-rails (= 4.3.3)
   listen (>= 3.0.5, < 3.2)
   mysql2 (~> 0.5.1)
-  puma (~> 3.11)
+  puma (~> 3.12)
   rails (~> 5.2.0)
   sass-rails (~> 5.0)
   select2-rails (= 4.0.3)