diff --git a/Gemfile b/Gemfile
index 03693959..4dce9ae0 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ gem 'rails', '5.2.8.1'
 
 gem 'pg'
 
-gem 'puma', '~> 3.12.2'
+gem 'puma', '~> 6.4.3'
 
 gem 'chartkick'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 4f4ff1f5..a6359764 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -269,7 +269,8 @@ GEM
       interception (>= 0.5)
       pry
     public_suffix (3.0.2)
-    puma (3.12.2)
+    puma (6.4.3)
+      nio4r (~> 2.0)
     pundit (1.1.0)
       activesupport (>= 3.0.0)
     racc (1.6.2)
@@ -453,7 +454,7 @@ DEPENDENCIES
   pry-rails
   pry-remote
   pry-rescue
-  puma (~> 3.12.2)
+  puma (~> 6.4.3)
   pundit
   rack-mini-profiler
   rack-timeout (~> 0.5.0)