diff --git a/Gemfile b/Gemfile
index 602be6f..8751db2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 5.2.2'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3'
 # Use Puma as the app server
-gem 'puma', '~> 3.11'
+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 546d514..26d78bb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -170,7 +170,7 @@ GEM
       mini_portile2 (~> 2.4.0)
     orm_adapter (0.5.0)
     public_suffix (3.0.3)
-    puma (3.12.0)
+    puma (3.12.6)
     rack (2.0.6)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -310,7 +310,7 @@ DEPENDENCIES
   jbuilder (~> 2.5)
   letter_opener
   listen (>= 3.0.5, < 3.2)
-  puma (~> 3.11)
+  puma (~> 3.12)
   rails (~> 5.2.2)
   rails-controller-testing
   redcarpet