diff --git a/Gemfile b/Gemfile
index 80138a8..6a1ac87 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,7 +11,7 @@ gem 'rails', '~> 6.0.4'
 # Please DO NOT change the database to pg or mysql without good reason
 gem 'sqlite3'
 # Use Puma as the app server
-gem 'puma', '~> 3.12'
+gem 'puma', '~> 4.3'
 
 # Reduces boot times through caching; required in config/boot.rb
 gem 'bootsnap', '>= 1.1.0', require: false
diff --git a/Gemfile.lock b/Gemfile.lock
index 00eff48..ac12ef6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -111,7 +111,8 @@ GEM
     parser (2.7.2.0)
       ast (~> 2.4.1)
     psych (3.1.0)
-    puma (3.12.2)
+    puma (4.3.11)
+      nio4r (~> 2.0)
     racc (1.5.2)
     rack (2.2.3)
     rack-test (1.1.0)
@@ -225,7 +226,7 @@ DEPENDENCIES
   brakeman
   byebug
   listen (>= 3.0.5, < 3.2)
-  puma (~> 3.12)
+  puma (~> 4.3)
   rails (~> 6.0.4)
   rails_best_practices
   reek