diff --git a/Gemfile b/Gemfile
index 9067966..9be6202 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ ruby '2.5.3'
 gem 'rails', '~> 5.2.2'
 gem 'pg', '>= 0.18', '< 2.0'
 # gem 'sqlite3'
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 3.12'
 gem 'sass-rails', '~> 5.0'
 gem 'uglifier', '>= 1.3.0'
 gem 'coffee-rails', '~> 4.2'
diff --git a/Gemfile.lock b/Gemfile.lock
index def262e..dda4c61 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -116,7 +116,7 @@ GEM
     nokogiri (1.10.7)
       mini_portile2 (~> 2.4.0)
     pg (1.2.2)
-    puma (3.12.2)
+    puma (3.12.3)
     rack (2.1.1)
     rack-cors (1.1.1)
       rack (>= 2.0.0)
@@ -229,7 +229,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   loofah (~> 2.3, >= 2.3.1)
   pg (>= 0.18, < 2.0)
-  puma (~> 3.11)
+  puma (~> 3.12)
   rack-cors
   rails (~> 5.2.2)
   rbnacl