diff --git a/Gemfile b/Gemfile
index ce1e7e6..9e134c3 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ ruby '2.6.2'
 
 gem 'rails', '~> 5.0.1'
 
-gem 'puma', '~> 3.0'
+gem 'puma', '~> 5.5'
 
 gem 'bootstrap-sass', '~> 3.3.6'
 gem 'sass-rails', '~> 5.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 7f1ef55..b9419e2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -191,7 +191,8 @@ GEM
     orm_adapter (0.5.0)
     pg (1.1.4)
     public_suffix (3.0.3)
-    puma (3.12.1)
+    puma (5.5.1)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-pjax (1.1.0)
       nokogiri (~> 1.5)
@@ -365,7 +366,7 @@ DEPENDENCIES
   mysql2
   nokogiri (~> 1.8.1)
   pg
-  puma (~> 3.0)
+  puma (~> 5.5)
   rails (~> 5.0.1)
   rails_admin (~> 1.1.1)
   ransack!