diff --git a/Gemfile b/Gemfile
index cb71c36..f7dd2c1 100644
--- a/Gemfile
+++ b/Gemfile
@@ -31,7 +31,7 @@ group :development do
   gem 'sqlite3', '~> 1.3.6'
 end
 # Use Puma as the app server
-gem 'puma', '~> 3.7'
+gem 'puma', '~> 4.3'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
 # Use Uglifier as compressor for JavaScript assets
diff --git a/Gemfile.lock b/Gemfile.lock
index 6909c63..a9c92f9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -71,6 +71,7 @@ GEM
       warden (~> 1.2.3)
     erubi (1.9.0)
     execjs (2.7.0)
+    ffi (1.13.1)
     ffi (1.13.1-x86-mingw32)
     font-awesome-rails (4.7.0.5)
       railties (>= 3.2, < 6.1)
@@ -101,12 +102,16 @@ GEM
     mini_portile2 (2.4.0)
     minitest (5.14.1)
     nio4r (2.5.2)
+    nokogiri (1.10.10)
+      mini_portile2 (~> 2.4.0)
     nokogiri (1.10.10-x86-mingw32)
       mini_portile2 (~> 2.4.0)
     orm_adapter (0.5.0)
+    pg (1.2.3)
     pg (1.2.3-x86-mingw32)
     public_suffix (4.0.5)
-    puma (3.12.6)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     rack (2.2.3)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -162,6 +167,7 @@ GEM
       actionpack (>= 4.0)
       activesupport (>= 4.0)
       sprockets (>= 3.0.0)
+    sqlite3 (1.3.13)
     sqlite3 (1.3.13-x86-mingw32)
     thor (1.0.1)
     thread_safe (0.3.6)
@@ -198,6 +204,7 @@ GEM
 
 PLATFORMS
   x86-mingw32
+  x86_64-linux
 
 DEPENDENCIES
   byebug (~> 11.0.1)
@@ -208,7 +215,7 @@ DEPENDENCIES
   jbuilder (~> 2.5)
   jquery-rails
   pg
-  puma (~> 3.7)
+  puma (~> 4.3)
   rails (~> 5.1.6)
   sass-rails (~> 5.0)
   selenium-webdriver