diff --git a/backend/Gemfile b/backend/Gemfile
index 4c3f93d..044f494 100644
--- a/backend/Gemfile
+++ b/backend/Gemfile
@@ -8,7 +8,7 @@ gem 'bootsnap', '>= 1.4.2', require: false
 gem 'jbuilder', '~> 2.7'
 gem 'jwt'
 gem 'pg', '>= 0.18', '< 2.0'
-gem 'puma', '~> 4.1'
+gem 'puma', '~> 4.3'
 gem 'rack-cors'
 gem 'rails', '~> 6.0.2', '>= 6.0.2.2'
 gem 'sass-rails', '>= 6'
diff --git a/backend/Gemfile.lock b/backend/Gemfile.lock
index d9ce716..1a99db4 100644
--- a/backend/Gemfile.lock
+++ b/backend/Gemfile.lock
@@ -118,8 +118,8 @@ GEM
     msgpack (1.3.3-java)
     msgpack (1.3.3-x64-mingw32)
     msgpack (1.3.3-x86-mingw32)
-    nio4r (2.5.2)
-    nio4r (2.5.2-java)
+    nio4r (2.5.8)
+    nio4r (2.5.8-java)
     nokogiri (1.10.9)
       mini_portile2 (~> 2.4.0)
     nokogiri (1.10.9-java)
@@ -131,9 +131,9 @@ GEM
     pg (1.2.3-x64-mingw32)
     pg (1.2.3-x86-mingw32)
     public_suffix (4.0.4)
-    puma (4.3.3)
+    puma (4.3.11)
       nio4r (~> 2.0)
-    puma (4.3.3-java)
+    puma (4.3.11-java)
       nio4r (~> 2.0)
     rack (2.2.2)
     rack-cors (1.1.1)
@@ -251,7 +251,7 @@ DEPENDENCIES
   jwt
   listen (>= 3.0.5, < 3.2)
   pg (>= 0.18, < 2.0)
-  puma (~> 4.1)
+  puma (~> 4.3)
   rack-cors
   rails (~> 6.0.2, >= 6.0.2.2)
   sass-rails (>= 6)