diff --git a/Gemfile b/Gemfile
index 47fcd57b..817b70b3 100644
--- a/Gemfile
+++ b/Gemfile
@@ -16,7 +16,7 @@ gem 'rails', '~> 6.0.0'
 # Use postgresql as the database for Active Record
 gem 'pg', '>= 0.18', '< 2.0'
 # Use Puma as the app server
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 
 gem "pundit"
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 4a2183db..9d59788b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -160,7 +160,9 @@ GEM
       mimemagic (~> 0.3.2)
     maruku (0.7.3)
     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 (5.14.0)
@@ -199,7 +201,8 @@ GEM
     pry-byebug (3.9.0)
       byebug (~> 11.0)
       pry (~> 0.13.0)
-    puma (3.12.4)
+    puma (4.3.8)
+      nio4r (~> 2.0)
     pundit (2.1.0)
       activesupport (>= 3.0.0)
     rack (2.2.2)
@@ -380,7 +383,7 @@ DEPENDENCIES
   omniauth-google-oauth2
   pg (>= 0.18, < 2.0)
   pry-byebug
-  puma (~> 3.11)
+  puma (~> 4.3)
   pundit
   rails (~> 6.0.0)
   rails_admin (~> 2.0)