diff --git a/Gemfile b/Gemfile
old mode 100755
new mode 100644
index 54063e0..77646d3
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 5.2.1'
 # Use mysql as the database for Active Record
 gem 'mysql2', '>= 0.4.4', '< 0.6.0'
 # Use Puma as the app server
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 5.6'
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
 gem 'jbuilder', '~> 2.5'
 # Use Redis adapter to run Action Cable in production
diff --git a/Gemfile.lock b/Gemfile.lock
index 836b212..4268d5e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -83,7 +83,9 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (0.9.2)
-    mimemagic (0.3.3)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.1)
     mini_portile2 (2.4.0)
     minitest (5.11.3)
@@ -110,7 +112,8 @@ GEM
       yard (~> 0.9.11)
     pry-rails (0.3.9)
       pry (>= 0.10.4)
-    puma (3.12.1)
+    puma (5.6.2)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-cors (1.0.3)
     rack-test (1.1.0)
@@ -213,7 +216,7 @@ DEPENDENCIES
   pry-byebug
   pry-doc
   pry-rails
-  puma (~> 3.11)
+  puma (~> 5.6)
   rack-cors
   rails (~> 5.2.1)
   redis (~> 4.0)