diff --git a/Gemfile b/Gemfile
index 428f79c..163ec1a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ ruby '2.5.3'
 
 gem 'rails', '~> 5.2.1'
 gem 'pg', '>= 0.18', '< 2.0'
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 3.12'
 gem 'uglifier', '>= 1.3.0'
 gem 'webpacker'
 gem 'turbolinks', '~> 5'
diff --git a/Gemfile.lock b/Gemfile.lock
index a13b856..deb8445 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -143,7 +143,9 @@ GEM
     mime-types (3.2.2)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2018.0812)
-    mimemagic (0.3.3)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.1)
     mini_portile2 (2.4.0)
     minitest (5.11.3)
@@ -158,7 +160,7 @@ GEM
       mini_portile2 (~> 2.4.0)
     orm_adapter (0.5.0)
     pg (1.1.3)
-    puma (3.12.0)
+    puma (3.12.6)
     rack (2.0.6)
     rack-protection (2.0.5)
       rack
@@ -303,7 +305,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   loofah (>= 2.2.3)
   pg (>= 0.18, < 2.0)
-  puma (~> 3.11)
+  puma (~> 3.12)
   rack (>= 2.0.6)
   rails (~> 5.2.1)
   responders (~> 2.4)