diff --git a/Gemfile b/Gemfile
index bd4bd06..8b3603a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ end
 ruby '2.4.6'
 gem 'rails', '~> 5.0.7'
 gem 'sqlite3'
-gem 'puma', '~> 3.0'
+gem 'puma', '~> 4.3'
 gem 'sass-rails', '~> 5.0'
 gem 'uglifier', '>= 1.3.0'
 gem 'coffee-rails', '~> 4.2'
diff --git a/Gemfile.lock b/Gemfile.lock
index 1e69ad5..01ba2b2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -156,7 +156,8 @@ GEM
     omniauth-twitter (1.4.0)
       omniauth-oauth (~> 1.1)
       rack
-    puma (3.11.4)
+    puma (4.3.11)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -267,7 +268,7 @@ DEPENDENCIES
   omniauth-github
   omniauth-google-oauth2
   omniauth-twitter
-  puma (~> 3.0)
+  puma (~> 4.3)
   rack (>= 2.0.6)
   rails (~> 5.0.7)
   rails_layout