diff --git a/Gemfile b/Gemfile
index 3aaec69..12529fb 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 6.0.0'
 # Use postgresql as the database for Active Record
 gem 'pg', '>= 0.18', '< 2.0'
 # Use Puma as the app server
-gem 'puma', '~> 3.11'
+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 c4359d4..f751288 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -69,6 +69,7 @@ GEM
     factory_bot_rails (5.0.2)
       factory_bot (~> 5.0.2)
       railties (>= 4.2.0)
+    ffi (1.12.1)
     ffi (1.12.1-x64-mingw32)
     globalid (0.4.2)
       activesupport (>= 4.2.0)
@@ -99,13 +100,18 @@ 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)
     multi_xml (0.6.0)
     nio4r (2.5.2)
+    nokogiri (1.10.7)
+      mini_portile2 (~> 2.4.0)
     nokogiri (1.10.7-x64-mingw32)
       mini_portile2 (~> 2.4.0)
+    pg (1.2.2)
     pg (1.2.2-x64-mingw32)
-    puma (3.12.2)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     rack (2.1.1)
     rack-cors (1.1.1)
       rack (>= 2.0.0)
@@ -180,6 +186,7 @@ GEM
 
 PLATFORMS
   x64-mingw32
+  x86_64-linux
 
 DEPENDENCIES
   bootsnap (>= 1.4.2)
@@ -191,7 +198,7 @@ DEPENDENCIES
   jwt
   nokogiri
   pg (>= 0.18, < 2.0)
-  puma (~> 3.11)
+  puma (~> 4.3)
   rack-cors
   rails (~> 6.0.0)
   rspec-rails