diff --git a/amqp-app-dashboard/Gemfile b/amqp-app-dashboard/Gemfile
index e3c8bbd..2af6c7a 100644
--- a/amqp-app-dashboard/Gemfile
+++ b/amqp-app-dashboard/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 6.0.0.rc1'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3', '~> 1.4'
 # Use Puma as the app server
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5'
 # Transpile app-like JavaScript. Read more: https://github.com/rails/webpacker
diff --git a/amqp-app-dashboard/Gemfile.lock b/amqp-app-dashboard/Gemfile.lock
index 192ecd0..2b34454 100644
--- a/amqp-app-dashboard/Gemfile.lock
+++ b/amqp-app-dashboard/Gemfile.lock
@@ -98,7 +98,9 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (0.9.2)
-    mimemagic (0.3.3)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.1)
     mini_portile2 (2.4.0)
     minitest (5.11.3)
@@ -107,7 +109,8 @@ GEM
     nokogiri (1.10.3)
       mini_portile2 (~> 2.4.0)
     public_suffix (3.1.1)
-    puma (3.12.1)
+    puma (4.3.11)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-proxy (0.6.5)
       rack
@@ -237,7 +240,7 @@ DEPENDENCIES
   capybara (>= 2.15)
   jbuilder (~> 2.5)
   listen (>= 3.0.5, < 3.2)
-  puma (~> 3.11)
+  puma (~> 4.3)
   rails (~> 6.0.0.rc1)
   redis-namespace
   redis-rails