diff --git a/Gemfile b/Gemfile
index 52b4a7c..07c3a2e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ ruby '2.6.0'
 gem 'rails',          '6.0.2.1'
 gem 'bcrypt',         '3.1.12'
 gem 'bootstrap-sass', '3.4.1'
-gem 'puma',           '3.12.2'
+gem 'puma',           '4.3.11'
 gem 'sass-rails',     '5.1.0'
 gem 'webpacker',      '4.0.7'
 gem 'turbolinks',     '5.2.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 133bc74..d8e9781 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -119,7 +119,9 @@ 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_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.11.3)
@@ -141,7 +143,8 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     public_suffix (4.0.3)
-    puma (3.12.2)
+    puma (4.3.11)
+      nio4r (~> 2.0)
     rack (2.1.1)
     rack-proxy (0.6.5)
       rack
@@ -258,7 +261,7 @@ DEPENDENCIES
   minitest (= 5.11.3)
   minitest-reporters (= 1.3.8)
   pg (= 1.1.4)
-  puma (= 3.12.2)
+  puma (= 4.3.11)
   rails (= 6.0.2.1)
   rails-controller-testing (= 1.0.4)
   sass-rails (= 5.1.0)