diff --git a/Gemfile b/Gemfile
index 2e9be2d..76d0708 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ end
 
 gem 'rails', '~> 5.1.4'
 gem 'pg', '~> 0.18'
-gem 'puma', '~> 3.7'
+gem 'puma', '~> 4.3'
 gem 'rack-cors', :require => 'rack/cors'
 gem 'devise'
 gem 'faker'
diff --git a/Gemfile.lock b/Gemfile.lock
index acacfff..72514ee 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -151,7 +151,8 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     public_suffix (3.0.2)
-    puma (3.11.4)
+    puma (4.3.9)
+      nio4r (~> 2.0)
     rack (2.0.4)
     rack-cors (1.0.2)
     rack-pjax (1.0.0)
@@ -285,7 +286,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   pg (~> 0.18)
   pry
-  puma (~> 3.7)
+  puma (~> 4.3)
   rack-cors
   rails (~> 5.1.4)
   rails_admin (~> 1.2)