diff --git a/Gemfile b/Gemfile
index 97fc5efb..3682ee52 100644
--- a/Gemfile
+++ b/Gemfile
@@ -24,7 +24,7 @@ gem 'rails', '~> 5.2.2'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3', '~> 1.3.6'
 # Use Puma as the app server
-gem 'puma', '~> 4.3'
+gem 'puma', '~> 5.6'
 # Use SCSS for stylesheets
 gem 'sassc'
 # Use Uglifier as compressor for JavaScript assets
diff --git a/Gemfile.lock b/Gemfile.lock
index 5dcb3c5c..849041f3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -131,13 +131,13 @@ GEM
     minitest (5.14.2)
     msgpack (1.2.9)
     multi_json (1.13.1)
-    nio4r (2.5.4)
+    nio4r (2.5.9)
     nokogiri (1.13.4)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
     popper_js (1.14.5)
     public_suffix (4.0.6)
-    puma (4.3.8)
+    puma (5.6.7)
       nio4r (~> 2.0)
     racc (1.6.0)
     rack (2.2.6.3)
@@ -245,7 +245,7 @@ DEPENDENCIES
   jquery-turbolinks
   letter_opener
   listen (>= 3.0.5, < 3.2)
-  puma (~> 4.3)
+  puma (~> 5.6)
   rails (~> 5.2.2)
   responders
   sassc