diff --git a/Gemfile b/Gemfile
index 7dab9a5..f184e74 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@ git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
 gem 'rails', '~> 6.1'
 gem 'pg', '>= 0.18', '< 2.0'
-gem 'puma', '~> 5.6'
+gem 'puma', '~> 6.4'
 
 gem 'panoptes-client'
 gem 'pundit'
diff --git a/Gemfile.lock b/Gemfile.lock
index 3476690..d357a75 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -149,7 +149,7 @@ GEM
       timeout
     net-smtp (0.3.3)
       net-protocol
-    nio4r (2.5.8)
+    nio4r (2.5.9)
     nokogiri (1.13.10)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
@@ -167,7 +167,7 @@ GEM
       pry (~> 0.13.0)
     pry-rails (0.3.9)
       pry (>= 0.10.4)
-    puma (5.6.4)
+    puma (6.4.0)
       nio4r (~> 2.0)
     pundit (2.1.1)
       activesupport (>= 3.0.0)
@@ -279,7 +279,7 @@ DEPENDENCIES
   pg (>= 0.18, < 2.0)
   pry-byebug
   pry-rails
-  puma (~> 5.6)
+  puma (~> 6.4)
   pundit
   pundit-matchers
   rack-cors