diff --git a/Gemfile b/Gemfile
index c139d31..7f4ed00 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'haml', '~> 4.0.6'
 gem 'json', '~> 2.1'
 gem 'sidekiq', '~> 5.0.4'
 gem 'mail', '~> 2.6.6'
-gem 'puma', '~> 3.9.1'
+gem 'puma', '~> 3.12.1'
 gem 'newrelic_rpm', '~> 3.18.1'
 gem 'rack_csrf', '~> 2.6.0'
 gem 'rack-flash3', '~> 1.0.5'
diff --git a/Gemfile.lock b/Gemfile.lock
index d679555..3491b96 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -41,7 +41,7 @@ GEM
       multi_json (~> 1.3)
       multi_xml (~> 0.5)
       rack (~> 1.2)
-    puma (3.9.1)
+    puma (3.12.1)
     rack (1.6.8)
     rack-flash3 (1.0.5)
       rack
@@ -83,7 +83,7 @@ DEPENDENCIES
   mail (~> 2.6.6)
   newrelic-redis (~> 2.0.0)
   newrelic_rpm (~> 3.18.1)
-  puma (~> 3.9.1)
+  puma (~> 3.12.1)
   rack-flash3 (~> 1.0.5)
   rack_csrf (~> 2.6.0)
   redis (~> 3.3.3)