diff --git a/Gemfile b/Gemfile
index a267f8c..3e7573a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@ ruby '2.4.0'
 
 gem 'active_model_serializers'
 gem 'pg', '~> 0.18'
-gem 'puma', '~> 3.0'
+gem 'puma', '~> 3.12'
 gem 'rack-cors'
 gem 'rails', '~> 5.0.2'
 gem 'tzinfo-data'
diff --git a/Gemfile.lock b/Gemfile.lock
index 4025316..755686d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -85,7 +85,7 @@ GEM
       ast (~> 2.2)
     pg (0.20.0)
     powerpack (0.1.1)
-    puma (3.8.2)
+    puma (3.12.2)
     rack (2.0.1)
     rack-cors (0.4.1)
     rack-test (0.6.3)
@@ -178,7 +178,7 @@ DEPENDENCIES
   faker
   listen (~> 3.0.5)
   pg (~> 0.18)
-  puma (~> 3.0)
+  puma (~> 3.12)
   rack-cors
   rails (~> 5.0.2)
   rspec-rails (~> 3.5)