diff --git a/Gemfile b/Gemfile
index 527521b..9cbc5f4 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ end
 gem 'rack-cors', :require => 'rack/cors'
 gem 'rails', '~> 5.2.1'
 gem 'pg', '~> 1.1'
-gem 'puma', '~> 4.0'
+gem 'puma', '~> 4.3'
 gem 'sass-rails', '~> 5.0'
 gem 'uglifier', '>= 1.3.0'
 gem 'coffee-rails', '~> 5.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 07cf239..b3513c9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -148,12 +148,14 @@ 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)
     multi_json (1.13.1)
-    nio4r (2.4.0)
+    nio4r (2.5.7)
     nokogiri (1.10.3)
       mini_portile2 (~> 2.4.0)
     nokogiri (1.10.3-x86-mingw32)
@@ -163,7 +165,7 @@ GEM
     pg (1.1.4-x86-mingw32)
     popper_js (1.14.5)
     public_suffix (3.1.1)
-    puma (4.0.1)
+    puma (4.3.8)
       nio4r (~> 2.0)
     pundit (2.0.1)
       activesupport (>= 3.0.0)
@@ -286,7 +288,7 @@ DEPENDENCIES
   jquery-rails
   kaminari
   pg (~> 1.1)
-  puma (~> 4.0)
+  puma (~> 4.3)
   pundit
   rack-cors
   rails (~> 5.2.1)