diff --git a/Gemfile b/Gemfile
index 5c6ddbd..c9a5f85 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,7 +5,7 @@ ruby '2.6.3'
 
 gem 'rails', '~> 6.0.0.rc1'
 gem 'pg'
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 gem 'sass-rails', '~> 5'
 gem 'webpacker', '~> 4.0'
 gem "autoprefixer-rails"
diff --git a/Gemfile.lock b/Gemfile.lock
index ece5e7f..eeb7b59 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -114,7 +114,8 @@ GEM
       mini_portile2 (~> 2.4.0)
     pg (1.1.4)
     public_suffix (3.1.1)
-    puma (3.12.1)
+    puma (4.3.11)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-proxy (0.6.5)
       rack
@@ -224,7 +225,7 @@ DEPENDENCIES
   jbuilder (~> 2.5)
   listen (>= 3.0.5, < 3.2)
   pg
-  puma (~> 3.11)
+  puma (~> 4.3)
   rails (~> 6.0.0.rc1)
   react-rails
   sass-rails (~> 5)