diff --git a/chat-api/Gemfile b/chat-api/Gemfile
index bab206c..a2e8ac0 100644
--- a/chat-api/Gemfile
+++ b/chat-api/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 6.0.0'
 # Use mysql as the database for Active Record
 gem 'mysql2', '>= 0.4.4'
 # Use Puma as the app server
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
 # gem 'jbuilder', '~> 2.7'
 # Use Redis adapter to run Action Cable in production
diff --git a/chat-api/Gemfile.lock b/chat-api/Gemfile.lock
index e89c803..6ac9b87 100644
--- a/chat-api/Gemfile.lock
+++ b/chat-api/Gemfile.lock
@@ -113,7 +113,8 @@ GEM
     nio4r (2.5.2)
     nokogiri (1.10.5)
       mini_portile2 (~> 2.4.0)
-    puma (3.12.1)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     raabro (1.1.6)
     rack (2.0.7)
     rack-cache (1.10.0)
@@ -218,7 +219,7 @@ DEPENDENCIES
   elasticsearch-rails
   listen (>= 3.0.5, < 3.2)
   mysql2 (>= 0.4.4)
-  puma (~> 3.11)
+  puma (~> 4.3)
   rails (~> 6.0.0)
   redis (~> 4.0)
   redis-namespace