diff --git a/examples/todo-vuejs/Gemfile b/examples/todo-vuejs/Gemfile
index 150d760..9c1b684 100644
--- a/examples/todo-vuejs/Gemfile
+++ b/examples/todo-vuejs/Gemfile
@@ -6,7 +6,7 @@ gem 'rails', '~> 5.1'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3'
 # Use Puma as the app server
-gem 'puma', '~> 3.0'
+gem 'puma', '~> 5.6'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
 # Use Uglifier as compressor for JavaScript assets
diff --git a/examples/todo-vuejs/Gemfile.lock b/examples/todo-vuejs/Gemfile.lock
index 664ca1b..e28757a 100644
--- a/examples/todo-vuejs/Gemfile.lock
+++ b/examples/todo-vuejs/Gemfile.lock
@@ -101,7 +101,8 @@ GEM
     pry-byebug (3.4.2)
       byebug (~> 9.0)
       pry (~> 0.10)
-    puma (3.8.2)
+    puma (5.6.2)
+      nio4r (~> 2.0)
     rack (2.0.1)
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -183,7 +184,7 @@ DEPENDENCIES
   jquery-rails
   listen (~> 3.0.5)
   pry-byebug
-  puma (~> 3.0)
+  puma (~> 5.6)
   rails (~> 5.1)
   redis
   sass-rails (~> 5.0)