diff --git a/Gemfile b/Gemfile
index 9b771a7..b26f428 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,7 +9,7 @@ ruby '2.5.1'
 gem 'bootsnap', '>= 1.2', require: false
 gem 'rails', '~> 6.0.2'
 gem 'pg', '>= 0.18', '< 2.0'
-gem 'puma', '~> 3.7'
+gem 'puma', '~> 4.3'
 gem 'rack-cors', require: 'rack/cors'
 
 group :development, :test do
diff --git a/Gemfile.lock b/Gemfile.lock
index eb71838..809f978 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -111,7 +111,8 @@ GEM
       pry (~> 0.10)
     pry-rails (0.3.9)
       pry (>= 0.10.4)
-    puma (3.12.2)
+    puma (4.3.9)
+      nio4r (~> 2.0)
     rack (2.2.2)
     rack-cors (1.1.1)
       rack (>= 2.0.0)
@@ -207,7 +208,7 @@ DEPENDENCIES
   pg (>= 0.18, < 2.0)
   pry-byebug
   pry-rails
-  puma (~> 3.7)
+  puma (~> 4.3)
   rack-cors
   rails (~> 6.0.2)
   rspec-rails