diff --git a/Gemfile b/Gemfile
index 67b156b339..997fc2ccd5 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 5.2.4'
 # Use postgresql as the database for Active Record
 gem 'pg', '>= 0.18', '< 2.0'
 # Use Puma as the app server
-gem 'puma', '~> 3.12'
+gem 'puma', '~> 5.6'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
 # Use Uglifier as compressor for JavaScript assets
diff --git a/Gemfile.lock b/Gemfile.lock
index b67d4b3306..857d062589 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -107,7 +107,8 @@ GEM
       ast (~> 2.4.0)
     pg (1.2.2)
     pg (1.2.2-x64-mingw32)
-    puma (3.12.6)
+    puma (5.6.7)
+      nio4r (~> 2.0)
     racc (1.5.2)
     rack (2.2.3)
     rack-test (1.1.0)
@@ -226,7 +227,7 @@ DEPENDENCIES
   jbuilder (~> 2.5)
   listen (>= 3.0.5, < 3.2)
   pg (>= 0.18, < 2.0)
-  puma (~> 3.12)
+  puma (~> 5.6)
   rails (~> 5.2.4)
   rspec
   rubocop