diff --git a/Gemfile b/Gemfile
index 7349523..36c72dd 100644
--- a/Gemfile
+++ b/Gemfile
@@ -30,7 +30,7 @@ end
 # Use devise here for db management
 gem 'devise', '4.7.1'
 # Use Puma as the app server
-gem 'puma', '~> 3.12'
+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 aa58668..0745357 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -175,7 +175,8 @@ GEM
       method_source (~> 0.8.1)
       slop (~> 3.4)
     public_suffix (4.0.1)
-    puma (3.12.4)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     rack (2.0.8)
     rack-protection (2.0.2)
       rack
@@ -333,7 +334,7 @@ DEPENDENCIES
   listen (~> 3.0.5)
   mysql2 (~> 0.5.2)
   pry
-  puma (~> 3.12)
+  puma (~> 4.3)
   rails (~> 5.2, >= 5.2.3)
   rails-controller-testing
   rails-settings-cached