diff --git a/examples/myapp/Gemfile b/examples/myapp/Gemfile
index c254d5f..2b944a9 100644
--- a/examples/myapp/Gemfile
+++ b/examples/myapp/Gemfile
@@ -5,7 +5,7 @@ gem 'kube_queue', path: ENV['KUBE_QUEUE_PATH'] || '../../'
 
 gem 'rails', '~> 5.2.3'
 gem 'mysql2'
-gem 'puma', '~> 4.3'
+gem 'puma', '~> 5.3'
 gem 'sass-rails', '~> 5.0'
 gem 'uglifier', '>= 1.3.0'
 gem 'mini_racer', platforms: :ruby
diff --git a/examples/myapp/Gemfile.lock b/examples/myapp/Gemfile.lock
index 13f4fc8..0f5b3b3 100644
--- a/examples/myapp/Gemfile.lock
+++ b/examples/myapp/Gemfile.lock
@@ -158,7 +158,9 @@ 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 (1.0.2)
     mini_portile2 (2.4.0)
     mini_racer (0.2.6)
@@ -167,7 +169,7 @@ GEM
     msgpack (1.3.1)
     multi_json (1.14.1)
     mysql2 (0.5.2)
-    nio4r (2.4.0)
+    nio4r (2.5.7)
     nokogiri (1.10.5)
       mini_portile2 (~> 2.4.0)
     pry (0.12.2)
@@ -179,7 +181,7 @@ GEM
     pry-rails (0.3.9)
       pry (>= 0.10.4)
     public_suffix (3.1.1)
-    puma (4.3.1)
+    puma (5.3.1)
       nio4r (~> 2.0)
     rack (2.0.8)
     rack-test (1.1.0)
@@ -282,7 +284,7 @@ DEPENDENCIES
   mysql2
   pry-byebug
   pry-rails
-  puma (~> 4.3)
+  puma (~> 5.3)
   rails (~> 5.2.3)
   sass-rails (~> 5.0)
   selenium-webdriver