diff --git a/Gemfile b/Gemfile
index a4b2c05..220b8f9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ gem 'rails', '~> 5.2.4', '>= 5.2.4.1'
 # Use sqlite3 as the database for Active Record
 #gem 'sqlite3'
 # Use Puma as the app server
-gem 'puma', '~> 4.0'
+gem 'puma', '~> 4.3'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
 # Use Uglifier as compressor for JavaScript assets
diff --git a/Gemfile.lock b/Gemfile.lock
index b79fa4d..6c50761 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -123,7 +123,9 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (1.0.0)
-    mimemagic (0.3.4)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.14.0)
@@ -134,13 +136,13 @@ GEM
     net-scp (2.0.0)
       net-ssh (>= 2.6.5, < 6.0.0)
     net-ssh (5.2.0)
-    nio4r (2.5.2)
+    nio4r (2.5.7)
     nokogiri (1.10.9)
       mini_portile2 (~> 2.4.0)
     nokogiri (1.10.9-x64-mingw32)
       mini_portile2 (~> 2.4.0)
     public_suffix (4.0.3)
-    puma (4.3.3)
+    puma (4.3.8)
       nio4r (~> 2.0)
     rack (2.2.2)
     rack-test (1.1.0)
@@ -247,7 +249,7 @@ DEPENDENCIES
   jbuilder (~> 2.5)
   listen
   mysql2
-  puma (~> 4.0)
+  puma (~> 4.3)
   rails (~> 5.2.4, >= 5.2.4.1)
   rails-i18n
   sass-rails (~> 5.0)