diff --git a/Gemfile b/Gemfile
index 7804a45..84e855b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@ source 'https://rubygems.org'
 
 gem 'rails', '~> 6.1'
 gem 'pg'
-gem 'puma', '~> 3.12'
+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 a92cbad..e8816e2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -206,7 +206,8 @@ GEM
     pry-rails (0.3.9)
       pry (>= 0.10.4)
     public_suffix (4.0.6)
-    puma (3.12.6)
+    puma (4.3.9)
+      nio4r (~> 2.0)
     pundit (1.1.0)
       activesupport (>= 3.0.0)
     racc (1.5.2)
@@ -397,7 +398,7 @@ DEPENDENCIES
   phonelib (~> 0.6.15)
   pry
   pry-rails
-  puma (~> 3.12)
+  puma (~> 4.3)
   pundit (~> 1.1)
   rack-cors (~> 1.0, >= 1.0.2)
   rails (~> 6.1)