diff --git a/code/Gemfile b/code/Gemfile
index d6c863b..2ae216e 100644
--- a/code/Gemfile
+++ b/code/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 6.0.2'
 # Use postgresql as the database for Active Record
 gem 'pg', '>= 0.18', '< 2.0'
 # Use Puma as the app server
-gem 'puma', '~> 4.1'
+gem 'puma', '~> 4.3'
 # Use SCSS for stylesheets
 gem 'sass-rails', '>= 6'
 # Transpile app-like JavaScript. Read more: https://github.com/rails/webpacker
diff --git a/code/Gemfile.lock b/code/Gemfile.lock
index 298720f..69d4096 100644
--- a/code/Gemfile.lock
+++ b/code/Gemfile.lock
@@ -112,7 +112,7 @@ GEM
       mini_portile2 (~> 2.4.0)
     pg (1.1.4)
     public_suffix (4.0.1)
-    puma (4.3.1)
+    puma (4.3.3)
       nio4r (~> 2.0)
     rack (2.0.8)
     rack-proxy (0.6.5)
@@ -221,7 +221,7 @@ DEPENDENCIES
   jbuilder (~> 2.7)
   listen (>= 3.0.5, < 3.2)
   pg (>= 0.18, < 2.0)
-  puma (~> 4.1)
+  puma (~> 4.3)
   rails (~> 6.0.2)
   react-rails (~> 2.6)
   sass-rails (>= 6)