diff --git a/Gemfile b/Gemfile
index a2749282..2857511a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -10,7 +10,7 @@ gem 'faker',                      '2.11.0'
 gem 'will_paginate',              '3.3.0'
 gem 'bootstrap-will_paginate',    '1.0.0'
 gem 'bootstrap-sass',             '3.4.1'
-gem 'puma',                       '4.3.5'
+gem 'puma',                       '4.3.12'
 gem 'sass-rails',                 '6.0.0'
 gem 'webpacker',                  '4.2.2'
 gem 'turbolinks',                 '5.2.1'
diff --git a/Gemfile.lock b/Gemfile.lock
index c48be164..5ca538c4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -164,7 +164,7 @@ GEM
       ruby-progressbar
     msgpack (1.4.2)
     nenv (0.3.0)
-    nio4r (2.5.7)
+    nio4r (2.5.8)
     nokogiri (1.11.4)
       mini_portile2 (~> 2.5.0)
       racc (~> 1.4)
@@ -182,7 +182,7 @@ GEM
     pry-nav (0.3.0)
       pry (>= 0.9.10, < 0.13.0)
     public_suffix (4.0.6)
-    puma (4.3.5)
+    puma (4.3.12)
       nio4r (~> 2.0)
     racc (1.5.2)
     rack (2.2.3)
@@ -318,7 +318,7 @@ DEPENDENCIES
   pg (= 1.2.3)
   pry
   pry-nav
-  puma (= 4.3.5)
+  puma (= 4.3.12)
   rails (= 6.1.3.1)
   rails-controller-testing (= 1.0.4)
   sass-rails (= 6.0.0)