diff --git a/Gemfile b/Gemfile
index 5425d197..aac9e258 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,7 +5,7 @@ ruby "2.6.6"
 # The following are from the default generated Gemfile for a new Rails 5.2 app:
 
 gem 'rails', '~> 5.2.4', '>= 5.2.4.3' # This is the version string generated by `rails new` on the current latest ~> 5 version of rails (5.2.4.3)
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 5.6'
 gem 'sass-rails', '~> 5.0'
 gem 'uglifier', '>= 1.3.0'
 gem 'therubyracer', platforms: :ruby # Default Rails 5.2 uses mini_racer, but we're already using therubyracer, so we'll stay with that for now.
diff --git a/Gemfile.lock b/Gemfile.lock
index 8d77ae71..6cbf2756 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1382,7 +1382,9 @@ GEM
     mime-types (3.3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2021.0225)
-    mimemagic (0.3.5)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.2)
     mini_portile2 (2.5.0)
     minitest (5.14.4)
@@ -1442,7 +1444,8 @@ GEM
       httpclient (~> 2.8, >= 2.8.3)
       json (>= 2.2.0, < 3)
       timers (>= 4.3.0)
-    puma (3.12.6)
+    puma (5.6.2)
+      nio4r (~> 2.0)
     racc (1.5.2)
     rack (2.2.3)
     rack-oauth2 (1.16.0)
@@ -1712,7 +1715,7 @@ DEPENDENCIES
   pdfkit
   pg (~> 0.2)
   pubnub
-  puma (~> 3.11)
+  puma (~> 5.6)
   rack-rewrite
   rails (~> 5.2.4, >= 5.2.4.3)
   rails-controller-testing