diff --git a/Gemfile b/Gemfile
index dbf2e27..0496c49 100644
--- a/Gemfile
+++ b/Gemfile
@@ -15,7 +15,7 @@ group :production do
 end
 
 # 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/Gemfile.lock b/Gemfile.lock
index 751a761..72ea716 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -179,7 +179,7 @@ GEM
     minitest (5.14.1)
     msgpack (1.3.3)
     multi_json (1.14.1)
-    nio4r (2.5.2)
+    nio4r (2.5.8)
     nokogiri (1.10.9)
       mini_portile2 (~> 2.4.0)
     orm_adapter (0.5.0)
@@ -187,7 +187,7 @@ GEM
     polyamorous (2.3.2)
       activerecord (>= 5.2.1)
     public_suffix (4.0.5)
-    puma (4.3.5)
+    puma (4.3.12)
       nio4r (~> 2.0)
     rack (2.2.2)
     rack-proxy (0.6.5)
@@ -310,7 +310,7 @@ DEPENDENCIES
   listen (~> 3.2)
   mini_magick (~> 4.10, >= 4.10.1)
   pg (~> 1.2, >= 1.2.3)
-  puma (~> 4.1)
+  puma (~> 4.3)
   rails (~> 6.0.3, >= 6.0.3.1)
   sass-rails (>= 6)
   selenium-webdriver