diff --git a/Gemfile b/Gemfile
old mode 100755
new mode 100644
index 1244064..5ba67c1
--- a/Gemfile
+++ b/Gemfile
@@ -9,7 +9,7 @@ gem 'rails', '~> 5.2.3'
 gem 'pg', '>= 0.18', '< 2.0'
 # Use Puma as the app server
 gem "rack", ">= 2.0.8"
-gem 'puma', '~> 3.12.2'
+gem 'puma', '~> 4.3.8'
 # 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 83d6275..310c793 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -128,7 +128,9 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (1.0.0)
-    mimemagic (0.3.4)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.14.0)
@@ -143,7 +145,8 @@ GEM
     pry-rails (0.3.9)
       pry (>= 0.10.4)
     public_suffix (4.0.3)
-    puma (3.12.4)
+    puma (4.3.8)
+      nio4r (~> 2.0)
     rack (2.2.2)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -241,7 +244,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   pg (>= 0.18, < 2.0)
   pry-rails
-  puma (~> 3.12.2)
+  puma (~> 4.3.8)
   rack (>= 2.0.8)
   rails (~> 5.2.3)
   sass-rails (~> 5.0)