diff --git a/Gemfile b/Gemfile
index 109cd34..e9774b8 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ ruby '2.4.1'
 gem "skylight"
 gem 'rails', '~> 5.2.4'
 gem 'pg', '>= 0.18', '< 2.0'
-gem 'puma', '~> 3.12'
+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 6681ac2..9d135b6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -179,7 +179,8 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     public_suffix (4.0.1)
-    puma (3.12.6)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     rack (2.2.3)
     rack-protection (2.0.8.1)
       rack
@@ -366,7 +367,7 @@ DEPENDENCIES
   omniauth-google-oauth2
   pg (>= 0.18, < 2.0)
   pry
-  puma (~> 3.12)
+  puma (~> 4.3)
   rails (~> 5.2.4)
   rspec-rails
   rubocop (~> 0.77.0)