diff --git a/Gemfile b/Gemfile
index 59d57f6..54d18c6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,7 +11,7 @@ gem 'rails', '~> 5.0.6'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3'
 # Use Puma as the app server
-gem 'puma', '~> 3.0'
+gem 'puma', '~> 4.3'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
 # Use Uglifier as compressor for JavaScript assets
diff --git a/Gemfile.lock b/Gemfile.lock
index d5f6544..cc7bc9d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -81,7 +81,8 @@ GEM
     nio4r (2.3.0)
     nokogiri (1.10.4)
       mini_portile2 (~> 2.4.0)
-    puma (3.11.3)
+    puma (4.3.11)
+      nio4r (~> 2.0)
     rack (2.0.4)
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -164,7 +165,7 @@ DEPENDENCIES
   jbuilder (~> 2.5)
   jquery-rails
   listen (~> 3.0.5)
-  puma (~> 3.0)
+  puma (~> 4.3)
   rails (~> 5.0.6)
   sass-rails (~> 5.0)
   spring