diff --git a/Gemfile b/Gemfile
index e896045..9a185aa 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,7 +5,7 @@ ruby '2.7.1'
 
 gem 'rails', '~> 6.0.3.3'
 gem 'mysql2', '~> 0.5.3'
-gem 'puma', '~> 4.3'
+gem 'puma', '~> 5.3'
 gem 'webpacker', '~> 5.2'
 gem 'jbuilder', '~> 2.9', '>= 2.9.1'
 gem 'bootsnap', '~> 1.4', require: false
diff --git a/Gemfile.lock b/Gemfile.lock
index bc42ed6..4c93bd5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -109,17 +109,19 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (1.0.0)
-    mimemagic (0.3.5)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.14.2)
     msgpack (1.3.3)
     mysql2 (0.5.3)
-    nio4r (2.5.3)
+    nio4r (2.5.7)
     nokogiri (1.10.10)
       mini_portile2 (~> 2.4.0)
     public_suffix (4.0.5)
-    puma (4.3.5)
+    puma (5.3.1)
       nio4r (~> 2.0)
     rack (2.2.3)
     rack-proxy (0.6.5)
@@ -257,7 +259,7 @@ DEPENDENCIES
   jbuilder (~> 2.9, >= 2.9.1)
   listen (~> 3.2, >= 3.2.1)
   mysql2 (~> 0.5.3)
-  puma (~> 4.3)
+  puma (~> 5.3)
   rails (~> 6.0.3.3)
   rails-controller-testing (~> 1.0)
   rspec-rails (~> 4.0)