diff --git a/Gemfile b/Gemfile
index ed52f2b..a8fa712 100644
--- a/Gemfile
+++ b/Gemfile
@@ -13,7 +13,7 @@ end
 gem 'rails', '~> 5.1.4'
 
 # Use Puma as the app server
-gem 'puma', '~> 3.7'
+gem 'puma', '~> 5.6'
 
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
 gem 'jbuilder', '~> 2.5'
diff --git a/Gemfile.lock b/Gemfile.lock
index c8cf0f4..b05c503 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -206,7 +206,8 @@ GEM
       coderay (~> 1.1)
       method_source (~> 1.0)
     public_suffix (5.0.1)
-    puma (3.12.6)
+    puma (5.6.7)
+      nio4r (~> 2.0)
     racc (1.6.2)
     rack (2.2.7)
     rack-test (2.1.0)
@@ -382,7 +383,7 @@ DEPENDENCIES
   once-ler
   pg
   pry
-  puma (~> 3.7)
+  puma (~> 5.6)
   rails (~> 5.1.4)
   responders
   rspec-its