diff --git a/backend/Gemfile b/backend/Gemfile
index 4c89747..0f5881e 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'
 # Use SCSS for stylesheets
 gem 'sass-rails', '>= 6'
 # Transpile app-like JavaScript. Read more: https://github.com/rails/webpacker
diff --git a/backend/Gemfile.lock b/backend/Gemfile.lock
index 9c77271..b70f1ef 100644
--- a/backend/Gemfile.lock
+++ b/backend/Gemfile.lock
@@ -95,19 +95,21 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (0.9.2)
-    mimemagic (0.3.4)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.14.0)
     msgpack (1.3.1)
-    nio4r (2.5.2)
+    nio4r (2.5.7)
     nokogiri (1.10.7)
       mini_portile2 (~> 2.4.0)
     pry (0.12.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     public_suffix (4.0.3)
-    puma (4.3.1)
+    puma (4.3.8)
       nio4r (~> 2.0)
     rack (2.1.2)
     rack-cors (1.1.1)
@@ -213,7 +215,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   nokogiri (~> 1.6, >= 1.6.8)
   pry (~> 0.12.2)
-  puma (~> 4.1)
+  puma (~> 4.3)
   rack-cors
   rails (~> 6.0.2, >= 6.0.2.1)
   sass-rails (>= 6)