diff --git a/Gemfile b/Gemfile
index db1e35d..1bad916 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,7 +7,7 @@ gem 'rails', '~> 5.0.0', '>= 5.0.0.1'
 # gem 'sqlite3'
 gem'pg'
 # 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 df2a29f..446cd77 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -110,7 +110,7 @@ GEM
       mini_portile2 (~> 2.1.0)
     pg (0.18.4)
     public_suffix (2.0.4)
-    puma (3.6.0)
+    puma (3.12.6)
     rack (2.0.1)
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -220,7 +220,7 @@ DEPENDENCIES
   jquery-rails
   listen (~> 3.0.5)
   pg
-  puma (~> 3.0)
+  puma (~> 3.12)
   rails (~> 5.0.0, >= 5.0.0.1)
   randumb
   sass-rails (~> 5.0)