diff --git a/Gemfile b/Gemfile
index 0cf1aed6..a264e6c6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'rails'
 # Use PostgreSQL as the database for Active Record
 gem 'pg'
 # Use Puma as the app server
-gem 'puma', '~> 3.7'
+gem 'puma', '~> 4.3'
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
 # gem 'jbuilder', '~> 2.5'
 # Use Redis adapter to run Action Cable in production
diff --git a/Gemfile.lock b/Gemfile.lock
index 906f12e4..07520921 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -185,7 +185,8 @@ GEM
     pry-stack_explorer (0.4.9.2)
       binding_of_caller (>= 0.7)
       pry (>= 0.9.11)
-    puma (3.10.0)
+    puma (4.3.8)
+      nio4r (~> 2.0)
     pundit (1.1.0)
       activesupport (>= 3.0.0)
     rack (2.0.6)
@@ -328,7 +329,7 @@ DEPENDENCIES
   pry-rails
   pry-rescue
   pry-stack_explorer
-  puma (~> 3.7)
+  puma (~> 4.3)
   pundit
   rack-cors
   rails