diff --git a/Gemfile b/Gemfile
index 3213193..6819e71 100644
--- a/Gemfile
+++ b/Gemfile
@@ -13,7 +13,7 @@ gem 'rails', '~> 5.0.6'
 # Use postgresql as the database for Active Record
 gem 'pg', '~> 0.18'
 # Use Puma as the app server
-gem 'puma', '~> 3.0'
+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 73f5160..6f76717 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -128,7 +128,7 @@ GEM
     orm_adapter (0.5.0)
     pg (0.21.0)
     popper_js (1.12.5)
-    puma (3.11.0)
+    puma (3.12.6)
     rack (2.0.3)
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -231,7 +231,7 @@ DEPENDENCIES
   listen (~> 3.0.5)
   pg (~> 0.18)
   popper_js (~> 1.12.3)
-  puma (~> 3.0)
+  puma (~> 3.12)
   rails (~> 5.0.6)
   rails-assets-tether (>= 1.3.3)!
   sass-rails (~> 5.0)