diff --git a/Gemfile b/Gemfile
index 22d0e67..aa05a6d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ gem 'rails', '~> 5.2.3'
 gem 'bootstrap-sass'
 gem 'popper_js'
 gem 'pg', '>= 0.18', '< 2.0'
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 gem 'devise'
 gem 'doorkeeper'
 gem 'will_paginate'
diff --git a/Gemfile.lock b/Gemfile.lock
index 7c7a67b..4c332bb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -147,7 +147,8 @@ GEM
     pg (1.2.3)
     popper_js (2.9.2)
     public_suffix (4.0.6)
-    puma (3.12.6)
+    puma (4.3.11)
+      nio4r (~> 2.0)
     racc (1.5.2)
     rack (2.2.3)
     rack-cors (1.1.1)
@@ -304,7 +305,7 @@ DEPENDENCIES
   pagy (~> 3.5)
   pg (>= 0.18, < 2.0)
   popper_js
-  puma (~> 3.11)
+  puma (~> 4.3)
   rack-cors (>= 1.0.4)
   rails (~> 5.2.3)
   rails-html-sanitizer (~> 1.0.4)