diff --git a/Gemfile b/Gemfile
index 77daabf..13bff6d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -10,7 +10,7 @@ end
 gem 'rails', '~> 5.1.3'
 gem 'pg'
 # Use Puma as the app server
-gem 'puma', '~> 3.7'
+gem 'puma', '~> 3.12'
 # 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 ea141c4..564479d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -135,7 +135,7 @@ GEM
     pg (0.21.0)
     popper_js (1.11.1)
     public_suffix (2.0.5)
-    puma (3.9.1)
+    puma (3.12.4)
     rack (2.0.3)
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -251,7 +251,7 @@ DEPENDENCIES
   jquery-rails
   listen (>= 3.0.5, < 3.2)
   pg
-  puma (~> 3.7)
+  puma (~> 3.12)
   rails (~> 5.1.3)
   redcarpet
   rouge