diff --git a/Gemfile b/Gemfile
index cc2b114..4020c9d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -10,7 +10,7 @@ gem 'rails', '~> 5.2.2'
 gem 'pg', '>= 0.18', '< 2.0'
 # gem 'pg' # adminos conflict
 # Use Puma as the app server
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 3.12'
 # gem 'puma', '~> 3.7' # adminos conflict
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index ec1a62f..44d670a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -248,7 +248,9 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (0.9.2)
-    mimemagic (0.3.3)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_magick (4.9.3)
     mini_mime (1.0.1)
     mini_portile2 (2.4.0)
@@ -322,7 +324,7 @@ GEM
     pry (0.12.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
-    puma (3.12.1)
+    puma (3.12.6)
     rack (2.0.7)
     rack-protection (2.0.5)
       rack
@@ -548,7 +550,7 @@ DEPENDENCIES
   pg_search
   postal-rails (~> 1.0)
   pry
-  puma (~> 3.11)
+  puma (~> 3.12)
   rails (~> 5.2.2)
   redis (~> 4.0)
   role_model