diff --git a/spec/dummy-app/Gemfile b/spec/dummy-app/Gemfile
index dc3c835..c4e219c 100644
--- a/spec/dummy-app/Gemfile
+++ b/spec/dummy-app/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 5.2.3'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3'
 # Use Puma as the app server
-gem 'puma', '~> 4.3'
+gem 'puma', '~> 5.6'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
 # Use Uglifier as compressor for JavaScript assets
diff --git a/spec/dummy-app/Gemfile.lock b/spec/dummy-app/Gemfile.lock
index 38d7daa..abefa1b 100644
--- a/spec/dummy-app/Gemfile.lock
+++ b/spec/dummy-app/Gemfile.lock
@@ -121,12 +121,12 @@ GEM
     mini_portile2 (2.4.0)
     minitest (5.14.2)
     msgpack (1.3.3)
-    nio4r (2.5.4)
+    nio4r (2.5.8)
     nokogiri (1.10.10)
       mini_portile2 (~> 2.4.0)
     orm_adapter (0.5.0)
     public_suffix (4.0.6)
-    puma (4.3.6)
+    puma (5.6.4)
       nio4r (~> 2.0)
     rack (2.2.3)
     rack-test (1.1.0)
@@ -242,7 +242,7 @@ DEPENDENCIES
   faker
   jbuilder (~> 2.5)
   listen (>= 3.0.5, < 3.2)
-  puma (~> 4.3)
+  puma (~> 5.6)
   rails (~> 5.2.3)
   rollbar (~> 2.11, >= 2.11.5)
   rspec-rails