diff --git a/Gemfile b/Gemfile
index 50f3193..12ef6b0 100644
--- a/Gemfile
+++ b/Gemfile
@@ -15,7 +15,7 @@ gem 'rails', '~> 5.0.7', '>= 5.0.7.2'
 gem 'pg'
 
 # Use Puma as the app server
-gem 'puma', '~> 3.0'
+gem 'puma', '~> 3.12'
 
 # Rack Middleware for handling Cross-Origin Resource Sharing (CORS), which makes cross-origin AJAX possible
 gem 'rack-cors'
diff --git a/Gemfile.lock b/Gemfile.lock
index b75ee68..685b8cb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -94,7 +94,7 @@ GEM
       ast (~> 2.4.0)
     pg (1.1.4)
     psych (3.1.0)
-    puma (3.12.2)
+    puma (3.12.3)
     rack (2.0.7)
     rack-cors (1.1.0)
       rack (>= 2.0.0)
@@ -191,7 +191,7 @@ DEPENDENCIES
   byebug
   listen (~> 3.0.5)
   pg
-  puma (~> 3.0)
+  puma (~> 3.12)
   rack-cors
   rails (~> 5.0.7, >= 5.0.7.2)
   rails_best_practices