diff --git a/Gemfile b/Gemfile
index ff270b9..e81adda 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 5.2.0'
 # 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'
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
 # gem 'jbuilder', '~> 2.5'
 # Use Redis adapter to run Action Cable in production
diff --git a/Gemfile.lock b/Gemfile.lock
index 42ddd0e..5940eba 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -117,7 +117,7 @@ GEM
     orm_adapter (0.5.0)
     pg (1.0.0)
     public_suffix (3.0.2)
-    puma (3.11.4)
+    puma (3.12.6)
     rack (2.0.5)
     rack-cors (1.0.2)
     rack-test (1.0.0)
@@ -211,7 +211,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   olive_branch
   pg (>= 0.18, < 2.0)
-  puma (~> 3.11)
+  puma (~> 3.12)
   rack-cors
   rails (~> 5.2.0)
   rspec-json_expectations