diff --git a/Gemfile b/Gemfile
index 2b309a7..cd8004a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 5.2.0'
 # Use mysql as the database for Active Record
 gem 'mysql2', '>= 0.4.4', '< 0.6.0'
 # Use Puma as the app server
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 3.12', '>= 3.12.2'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
 #gem 'sass-rails', '>= 3.2'
diff --git a/Gemfile.lock b/Gemfile.lock
index 176afa7..20d8bfe 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -161,7 +161,7 @@ GEM
       mini_portile2 (~> 2.4.0)
     orm_adapter (0.5.0)
     public_suffix (3.0.3)
-    puma (3.12.1)
+    puma (3.12.4)
     pundit (2.0.1)
       activesupport (>= 3.0.0)
     rack (2.0.7)
@@ -292,7 +292,7 @@ DEPENDENCIES
   kaminari
   listen (>= 3.0.5, < 3.2)
   mysql2 (>= 0.4.4, < 0.6.0)
-  puma (~> 3.11)
+  puma (~> 3.12, >= 3.12.2)
   pundit
   rack-attack
   rack-cors
@@ -311,4 +311,4 @@ RUBY VERSION
    ruby 2.5.1p57
 
 BUNDLED WITH
-   2.0.1
+   1.17.3