diff --git a/shine/Gemfile b/shine/Gemfile
index 9bebbbcf..72624d55 100644
--- a/shine/Gemfile
+++ b/shine/Gemfile
@@ -14,7 +14,7 @@ gem 'webpacker'
 # Use postgresql as the database for Active Record
 gem 'pg', '~> 0.18'
 # 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/shine/Gemfile.lock b/shine/Gemfile.lock
index 5e84b59f..a74889b3 100644
--- a/shine/Gemfile.lock
+++ b/shine/Gemfile.lock
@@ -110,7 +110,7 @@ GEM
       cliver (~> 0.3.1)
       websocket-driver (>= 0.2.0)
     public_suffix (3.0.2)
-    puma (3.11.4)
+    puma (3.12.6)
     rack (2.0.7)
     rack-proxy (0.6.4)
       rack
@@ -221,7 +221,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   pg (~> 0.18)
   poltergeist
-  puma (~> 3.7)
+  puma (~> 3.12)
   rails (~> 5.1.4)
   rspec-rails (~> 3.4)
   sass-rails (~> 5.0)