diff --git a/Gemfile b/Gemfile
index be9be49..a545463 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,7 +11,7 @@ gem 'haml-rails'
 gem 'jbuilder', '~> 2.5'
 gem 'meta-tags'
 gem 'pg', '>= 0.18', '< 2.0'
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 gem 'ridgepole'
 gem 'sass-rails', '~> 5.0'
 gem 'seed_migration'
diff --git a/Gemfile.lock b/Gemfile.lock
index c3d23c5..6be52bd 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -122,7 +122,9 @@ GEM
     meta-tags (2.11.1)
       actionpack (>= 3.2.0, < 6.1)
     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)
@@ -138,7 +140,8 @@ GEM
       method_source (~> 0.9.0)
     pry-rails (0.3.9)
       pry (>= 0.10.4)
-    puma (3.12.0)
+    puma (4.3.11)
+      nio4r (~> 2.0)
     rack (2.0.6)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -247,7 +250,7 @@ DEPENDENCIES
   meta-tags
   pg (>= 0.18, < 2.0)
   pry-rails
-  puma (~> 3.11)
+  puma (~> 4.3)
   rails (~> 5.2.2)
   ridgepole
   rspec-rails