diff --git a/Gemfile b/Gemfile
index c69990c..eab2119 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 6.0'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3'
 # Use Puma as the app server
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
 # Use Uglifier as compressor for JavaScript assets
diff --git a/Gemfile.lock b/Gemfile.lock
index 024e3f7..b60886c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -220,7 +220,8 @@ GEM
       actionpack (>= 4.2)
       omniauth (~> 2.0)
     public_suffix (4.0.6)
-    puma (3.12.6)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     racc (1.5.2)
     rack (2.2.3)
     rack-protection (2.1.0)
@@ -357,7 +358,7 @@ DEPENDENCIES
   omniauth-github
   omniauth-github-team-member
   omniauth-rails_csrf_protection
-  puma (~> 3.11)
+  puma (~> 4.3)
   rails (~> 6.0)
   rails-controller-testing
   rinku