diff --git a/backend/Gemfile b/backend/Gemfile
index 7e324386..b0f98a5e 100644
--- a/backend/Gemfile
+++ b/backend/Gemfile
@@ -6,7 +6,7 @@ ruby '2.6.5'
 # Infra
 gem 'rails', '~> 6.0.3', '>= 6.0.3.1'
 gem 'pg', '>= 0.18', '< 2.0'
-gem 'puma', '~> 4.1'
+gem 'puma', '~> 4.3'
 gem 'bootsnap', '>= 1.4.2', require: false
 gem 'rack-cors'
 
diff --git a/backend/Gemfile.lock b/backend/Gemfile.lock
index 1a816ace..6565e413 100644
--- a/backend/Gemfile.lock
+++ b/backend/Gemfile.lock
@@ -94,14 +94,14 @@ GEM
     mini_portile2 (2.4.0)
     minitest (5.14.1)
     msgpack (1.3.3)
-    nio4r (2.5.2)
+    nio4r (2.5.8)
     nokogiri (1.10.9)
       mini_portile2 (~> 2.4.0)
     pg (1.2.3)
     pry (0.13.1)
       coderay (~> 1.1)
       method_source (~> 1.0)
-    puma (4.3.5)
+    puma (4.3.9)
       nio4r (~> 2.0)
     rack (2.2.2)
     rack-cors (1.1.1)
@@ -189,7 +189,7 @@ DEPENDENCIES
   listen (~> 3.2)
   pg (>= 0.18, < 2.0)
   pry
-  puma (~> 4.1)
+  puma (~> 4.3)
   rack-cors
   rails (~> 6.0.3, >= 6.0.3.1)
   rspec-rails