diff --git a/Gemfile b/Gemfile
index 28e4eb8d..f5c9e838 100644
--- a/Gemfile
+++ b/Gemfile
@@ -24,7 +24,7 @@ gem 'jquery-rails', '~> 4.4', '>= 4.4.0'
 gem 'loofah', '>= 2.4.0'
 gem 'mysql2', '~> 0.5'
 gem 'pkg-config', '~> 1.1'
-gem 'puma', '~> 5.5' # app server
+gem 'puma', '~> 5.6' # app server
 gem 'rails', '~> 5.2'
 gem 'rails_autolink'
 gem 'rollbar' # Error reporting tool
diff --git a/Gemfile.lock b/Gemfile.lock
index 60b75307..5993e1d2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -276,7 +276,7 @@ GEM
     popper_js (1.16.0)
     powerpack (0.1.3)
     public_suffix (4.0.6)
-    puma (5.5.1)
+    puma (5.6.4)
       nio4r (~> 2.0)
     racc (1.5.2)
     rack (2.2.3)
@@ -488,7 +488,7 @@ DEPENDENCIES
   loofah (>= 2.4.0)
   mysql2 (~> 0.5)
   pkg-config (~> 1.1)
-  puma (~> 5.5)
+  puma (~> 5.6)
   rails (~> 5.2)
   rails-controller-testing (>= 1.0.4)
   rails_autolink