diff --git a/Gemfile b/Gemfile
index 2b75239..9ab2a6a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ ruby '2.5.0'
 
 gem 'rails', '~> 5.1.6'
 gem 'pg', '>= 0.18', '< 2.0'
-gem 'puma', '~> 3.7'
+gem 'puma', '~> 3.12'
 gem 'sass-rails', '~> 5.0'
 gem 'uglifier', '>= 1.3.0'
 gem 'coffee-rails', '~> 4.2'
diff --git a/Gemfile.lock b/Gemfile.lock
index df8237d..a3f4359 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -163,7 +163,7 @@ GEM
       method_source (~> 0.9.0)
     pry-rails (0.3.6)
       pry (>= 0.10.4)
-    puma (3.11.4)
+    puma (3.12.2)
     rack (2.0.5)
     rack-test (1.0.0)
       rack (>= 1.0, < 3)
@@ -277,7 +277,7 @@ DEPENDENCIES
   pg (>= 0.18, < 2.0)
   pgcli-rails (~> 0.3.0)
   pry-rails (~> 0.3.6)
-  puma (~> 3.7)
+  puma (~> 3.12)
   rails (~> 5.1.6)
   record_tag_helper (~> 1.0)
   sass-rails (~> 5.0)