diff --git a/Gemfile b/Gemfile
index 0e887b74c..366b823ee 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ gem 'compass-rails', '2.0.4'
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '4.2.11.1'
 # Use Puma as web server
-gem 'puma', '3.12.2'
+gem 'puma', '3.12.3'
 # Use SCSS for stylesheets
 gem 'sass-rails', '5.0.1'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 822661c2b..476f54584 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -287,7 +287,7 @@ GEM
     protected_attributes (1.1.3)
       activemodel (>= 4.0.1, < 5.0)
     public_suffix (3.0.2)
-    puma (3.12.2)
+    puma (3.12.3)
     pundit (1.0.0)
       activesupport (>= 3.0.0)
     raabro (1.1.6)
@@ -520,7 +520,7 @@ DEPENDENCIES
   prawn
   prawn-table
   protected_attributes
-  puma (= 3.12.2)
+  puma (= 3.12.3)
   pundit
   rack-protection (= 1.5.5)
   railroady