diff --git a/Gemfile b/Gemfile
old mode 100755
new mode 100644
index a646775..7e6dbb6
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@ ruby '2.7.1'
 gem 'rails'
 gem 'webpacker', '~> 4.0'
 gem 'pg', '~> 0.18'
-gem 'puma', '~> 3.0'
+gem 'puma', '~> 4.3'
 gem 'uglifier', '>= 1.3.0'
 # gem 'coffee-rails', '~> 4.2'
 gem 'jquery-rails'
diff --git a/Gemfile.lock b/Gemfile.lock
index 717cd2c..a39b129 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -244,7 +244,8 @@ GEM
       coderay (~> 1.1)
       method_source (~> 1.0)
     public_suffix (4.0.5)
-    puma (3.12.6)
+    puma (4.3.9)
+      nio4r (~> 2.0)
     raabro (1.3.1)
     rack (2.2.3)
     rack-proxy (0.6.5)
@@ -382,7 +383,7 @@ DEPENDENCIES
   pg (~> 0.18)
   phantomjs
   poltergeist (~> 1.18, >= 1.18.1)
-  puma (~> 3.0)
+  puma (~> 4.3)
   rails
   ruby-graphviz
   rufus-scheduler