diff --git a/Gemfile b/Gemfile
index 224358f..6d9b535 100644
--- a/Gemfile
+++ b/Gemfile
@@ -18,7 +18,7 @@ gem 'bootsnap', require: false
 
 # For heroku
 group :production do
-  gem 'puma', '~> 3.12.0'
+  gem 'puma', '~> 3.12.6'
   gem 'puma-heroku', '~> 1.0.0'
   gem 'heroku-deflater', '~> 0.6.3'
   gem 'image_optim', '~> 0.26.3'
diff --git a/Gemfile.lock b/Gemfile.lock
index 29dcacb..983de2a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -143,7 +143,9 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (0.9.2)
-    mimemagic (0.3.3)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.1)
     mini_portile2 (2.4.0)
     minitest (5.11.3)
@@ -162,7 +164,7 @@ GEM
     pry (0.12.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
-    puma (3.12.0)
+    puma (3.12.6)
     puma-heroku (1.0.0)
       puma (~> 3.0)
     rack (2.0.6)
@@ -275,7 +277,7 @@ DEPENDENCIES
   mailchimp-api (~> 2.0.6)
   newrelic_rpm
   pg (~> 1.1.4)
-  puma (~> 3.12.0)
+  puma (~> 3.12.6)
   puma-heroku (~> 1.0.0)
   rails (= 5.2.2)
   sass-rails (~> 5.0.7)