diff --git a/test/apps/rails5.2/Gemfile b/test/apps/rails5.2/Gemfile
index f65c285c8e..a4d4b35469 100644
--- a/test/apps/rails5.2/Gemfile
+++ b/test/apps/rails5.2/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 5.2.0.beta2'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3'
 # Use Puma as the app server
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
 # Use Uglifier as compressor for JavaScript assets
diff --git a/test/apps/rails5.2/Gemfile.lock b/test/apps/rails5.2/Gemfile.lock
index 087073bbd3..f094a83dfd 100644
--- a/test/apps/rails5.2/Gemfile.lock
+++ b/test/apps/rails5.2/Gemfile.lock
@@ -102,7 +102,8 @@ GEM
     nokogiri (1.8.1)
       mini_portile2 (~> 2.3.0)
     public_suffix (3.0.1)
-    puma (3.11.0)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     rack (2.0.3)
     rack-test (0.8.2)
       rack (>= 1.0, < 3)
@@ -195,7 +196,7 @@ DEPENDENCIES
   coffee-rails (~> 4.2)
   jbuilder (~> 2.5)
   listen (>= 3.0.5, < 3.2)
-  puma (~> 3.11)
+  puma (~> 4.3)
   rails (~> 5.2.0.beta2)
   sass-rails (~> 5.0)
   selenium-webdriver