diff --git a/preview/Gemfile b/preview/Gemfile
index cc7f00b0d..530d10ea2 100644
--- a/preview/Gemfile
+++ b/preview/Gemfile
@@ -6,7 +6,7 @@ ruby '3.0.0'
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '~> 6.0.3', '>= 6.0.3.4'
 # Use Puma as the app server
-gem 'puma', '~> 4.1'
+gem 'puma', '~> 4.3'
 # Transpile app-like JavaScript. Read more: https://github.com/rails/webpacker
 gem 'webpacker', '~> 4.0'
 
diff --git a/preview/Gemfile.lock b/preview/Gemfile.lock
index acd7d34d8..6222e2464 100644
--- a/preview/Gemfile.lock
+++ b/preview/Gemfile.lock
@@ -89,11 +89,11 @@ GEM
     mini_portile2 (2.6.1)
     minitest (5.14.2)
     msgpack (1.3.3)
-    nio4r (2.5.4)
+    nio4r (2.5.8)
     nokogiri (1.12.5)
       mini_portile2 (~> 2.6.1)
       racc (~> 1.4)
-    puma (4.3.6)
+    puma (4.3.9)
       nio4r (~> 2.0)
     racc (1.6.0)
     rack (2.2.3)
@@ -173,7 +173,7 @@ DEPENDENCIES
   bootsnap (>= 1.4.2)
   byebug
   listen (~> 3.2)
-  puma (~> 4.1)
+  puma (~> 4.3)
   rails (~> 6.0.3, >= 6.0.3.4)
   responders
   spring