diff --git a/backend/Gemfile b/backend/Gemfile
index 225a6fc..affe325 100644
--- a/backend/Gemfile
+++ b/backend/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 6.0.2', '>= 6.0.2.1'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3', '~> 1.4'
 # Use Puma as the app server
-gem 'puma', '~> 4.1'
+gem 'puma', '~> 4.3'
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
 # gem 'jbuilder', '~> 2.7'
 # Use Redis adapter to run Action Cable in production
diff --git a/backend/Gemfile.lock b/backend/Gemfile.lock
index ba7c846..8f09179 100644
--- a/backend/Gemfile.lock
+++ b/backend/Gemfile.lock
@@ -98,7 +98,7 @@ GEM
     nio4r (2.5.2)
     nokogiri (1.10.7)
       mini_portile2 (~> 2.4.0)
-    puma (4.3.1)
+    puma (4.3.5)
       nio4r (~> 2.0)
     rack (2.0.8)
     rack-cors (1.1.0)
@@ -167,7 +167,7 @@ DEPENDENCIES
   byebug
   jwt (~> 2.1)
   listen (>= 3.0.5, < 3.2)
-  puma (~> 4.1)
+  puma (~> 4.3)
   rack-cors
   rails (~> 6.0.2, >= 6.0.2.1)
   spring