diff --git a/Gemfile b/Gemfile
index 7c2d005..51cf333 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,7 +7,7 @@ ruby '2.4.2'
 gem 'rails', '~> 5.1.4'
 gem 'dotenv-rails'
 gem 'twilio-ruby'
-gem 'puma', '~> 3.7'
+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 d033c11..468c6cc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -167,7 +167,8 @@ GEM
     pg (0.21.0)
     popper_js (1.12.5)
     public_suffix (3.0.1)
-    puma (3.11.0)
+    puma (4.3.11)
+      nio4r (~> 2.0)
     rack (2.0.3)
     rack-test (0.8.2)
       rack (>= 1.0, < 3)
@@ -297,7 +298,7 @@ DEPENDENCIES
   launchy
   listen (>= 3.0.5, < 3.2)
   pg
-  puma (~> 3.7)
+  puma (~> 4.3)
   rails (~> 5.1.4)
   rails_layout
   rspec-rails