diff --git a/Gemfile b/Gemfile
index e80f521..9ffc5a2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,7 +9,7 @@ gem 'activeadmin'
 gem 'rails', '~> 5.2.3'
 # Use Puma as the app server
 gem 'pg'
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
 gem 'sprockets-rails', '~> 3.0', '>= 3.0.4'
diff --git a/Gemfile.lock b/Gemfile.lock
index d93eabc..0b0eac3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -192,7 +192,9 @@ 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_magick (4.9.5)
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
@@ -202,7 +204,6 @@ GEM
     nokogiri (1.10.3)
       mini_portile2 (~> 2.4.0)
     orm_adapter (0.5.0)
-    pagy (3.5.0)
     pg (1.1.4)
     pry (0.12.2)
       coderay (~> 1.1.0)
@@ -213,7 +214,8 @@ GEM
     pry-rails (0.3.9)
       pry (>= 0.10.4)
     public_suffix (3.1.1)
-    puma (3.12.1)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-proxy (0.6.5)
       rack
@@ -372,11 +374,10 @@ DEPENDENCIES
   letter_opener
   listen (>= 3.0.5, < 3.2)
   mini_magick (~> 4.5, >= 4.5.1)
-  pagy (~> 3.5)
   pg
   pry-byebug
   pry-rails
-  puma (~> 3.11)
+  puma (~> 4.3)
   rails (~> 5.2.3)
   react-rails
   rspec-rails (~> 3.8)