diff --git a/Gemfile b/Gemfile
index eccea3b..13143ea 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 6.0.2', '>= 6.0.2.1'
 # Use mysql as the database for Active Record
 gem 'mysql2', '>= 0.4.4'
 # 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/Gemfile.lock b/Gemfile.lock
index ae471f3..2a53116 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -82,12 +82,16 @@ GEM
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.14.0)
+    msgpack (1.3.1)
     msgpack (1.3.1-x64-mingw32)
+    mysql2 (0.5.3)
     mysql2 (0.5.3-x64-mingw32)
     nio4r (2.5.2)
+    nokogiri (1.10.7)
+      mini_portile2 (~> 2.4.0)
     nokogiri (1.10.7-x64-mingw32)
       mini_portile2 (~> 2.4.0)
-    puma (4.3.1)
+    puma (4.3.5)
       nio4r (~> 2.0)
     rack (2.1.2)
     rack-test (1.1.0)
@@ -138,6 +142,7 @@ GEM
     zeitwerk (2.2.2)
 
 PLATFORMS
+  ruby
   x64-mingw32
 
 DEPENDENCIES
@@ -146,7 +151,7 @@ DEPENDENCIES
   byebug
   composite_primary_keys (~> 12.0)
   mysql2 (>= 0.4.4)
-  puma (~> 4.1)
+  puma (~> 4.3)
   rails (~> 6.0.2, >= 6.0.2.1)
   tzinfo-data