diff --git a/Gemfile b/Gemfile
index 227d8577..e81c8c3b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -12,7 +12,7 @@ gem 'rails', '~> 5.2.1'
 # Use postgresql as the database for Active Record
 gem 'pg', '~> 1.1'
 # Use Puma as the app server
-gem 'puma', '3.12.0'
+gem 'puma', '3.12.3'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0.7'
 # Autoprefix CSS rules using values from Can I Use
diff --git a/Gemfile.lock b/Gemfile.lock
index 648e17a3..b626adc8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -354,7 +354,7 @@ GEM
     pry-rails (0.3.6)
       pry (>= 0.10.4)
     public_suffix (3.0.3)
-    puma (3.12.0)
+    puma (3.12.3)
     rack (2.0.6)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -570,7 +570,7 @@ DEPENDENCIES
   premailer-rails (~> 1.10)
   pry-byebug (~> 3.6)
   pry-rails (~> 0.3)
-  puma (= 3.12.0)
+  puma (= 3.12.3)
   rails (~> 5.2.1)
   rails_real_favicon (~> 0.0.11)
   rollbar (~> 2.15)