diff --git a/backend/Gemfile b/backend/Gemfile
index 04a4219..d26b93e 100644
--- a/backend/Gemfile
+++ b/backend/Gemfile
@@ -9,7 +9,7 @@ gem 'rails', '~> 6.0.3', '>= 6.0.3.2'
 # 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 305cc84..3458c33 100644
--- a/backend/Gemfile.lock
+++ b/backend/Gemfile.lock
@@ -85,13 +85,13 @@ GEM
     mini_portile2 (2.4.0)
     minitest (5.14.1)
     msgpack (1.3.3)
-    nio4r (2.5.2)
+    nio4r (2.5.8)
     nokogiri (1.10.10)
       mini_portile2 (~> 2.4.0)
     pry (0.13.1)
       coderay (~> 1.1)
       method_source (~> 1.0)
-    puma (4.3.5)
+    puma (4.3.12)
       nio4r (~> 2.0)
     rack (2.2.3)
     rack-cors (1.1.1)
@@ -157,7 +157,7 @@ DEPENDENCIES
   byebug
   listen (~> 3.2)
   pry
-  puma (~> 4.1)
+  puma (~> 4.3)
   rack-cors
   rails (~> 6.0.3, >= 6.0.3.2)
   spring