diff --git a/Gemfile b/Gemfile
index d57baba..9670ee9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,7 +11,7 @@ gem 'rails', '~> 5.2.0'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3'
 # Use Puma as the app server
-gem 'puma', '~> 3.7'
+gem 'puma', '~> 3.12'
 # Use SCSS for stylesheets
 gem 'sassc-rails'
 # Use Uglifier as compressor for JavaScript assets
diff --git a/Gemfile.lock b/Gemfile.lock
index 62cb538..a5a775c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -177,7 +177,7 @@ GEM
       mimemagic (~> 0.3.0)
       terrapin (~> 0.6.0)
     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)
@@ -304,7 +304,7 @@ DEPENDENCIES
   normalize-rails
   paperclip
   pokeviewer!
-  puma (~> 3.7)
+  puma (~> 3.12)
   rails (~> 5.2.0)
   sassc-rails
   selenium-webdriver