diff --git a/Gemfile b/Gemfile
index eff97b6..0b6625d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 5.2.1'
 # Use postgresql as the database for Active Record
 gem 'pg', '>= 0.18', '< 2.0'
 # Use Puma as the app server
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 3.12'
 # Transpile app-like JavaScript. Read more: https://github.com/rails/webpacker
 gem 'webpacker'
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
diff --git a/Gemfile.lock b/Gemfile.lock
index 226a111..dfd27e7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -91,7 +91,7 @@ GEM
       mini_portile2 (~> 2.5.0)
       racc (~> 1.4)
     pg (1.1.4)
-    puma (3.12.0)
+    puma (3.12.6)
     racc (1.5.2)
     rack (2.2.3)
     rack-proxy (0.6.5)
@@ -187,7 +187,7 @@ DEPENDENCIES
   jbuilder (~> 2.5)
   listen (>= 3.0.5, < 3.2)
   pg (>= 0.18, < 2.0)
-  puma (~> 3.11)
+  puma (~> 3.12)
   rails (~> 5.2.1)
   rspec-rails (~> 3.5)
   shoulda-matchers (~> 3.1)