diff --git a/Gemfile b/Gemfile
index 94ff6da..cb964be 100644
--- a/Gemfile
+++ b/Gemfile
@@ -12,7 +12,7 @@ end
 gem 'rails', '~> 5.0.1'
 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 c7a8454..cf58351 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -91,7 +91,7 @@ GEM
     nokogiri (1.7.0.1)
       mini_portile2 (~> 2.1.0)
     pg (0.19.0)
-    puma (3.12.1)
+    puma (3.12.6)
     rack (2.0.7)
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -190,7 +190,7 @@ DEPENDENCIES
   jquery-rails
   listen (~> 3.0.5)
   pg
-  puma (~> 3.0)
+  puma (~> 3.12)
   rails (~> 5.0.1)
   rspec-rails
   sass-rails (~> 5.0)