diff --git a/Gemfile b/Gemfile
old mode 100755
new mode 100644
index 9705c97..0d176d3
--- a/Gemfile
+++ b/Gemfile
@@ -7,7 +7,7 @@ end
 
 gem 'rails', '~> 5.1.6'
 gem 'pg', '~> 0.20.0'
-gem 'puma', '~> 3.7'
+gem 'puma', '~> 4.3'
 gem 'sass-rails', '~> 5.0'
 gem 'uglifier', '>= 1.3.0'
 gem 'webpacker'
diff --git a/Gemfile.lock b/Gemfile.lock
index 3057bc2..6bbbf4d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -78,14 +78,10 @@ GEM
     connection_pool (2.2.2)
     crass (1.0.5)
     erubi (1.9.0)
-    erubis (2.7.0)
     execjs (2.7.0)
     ffi (1.11.1)
     globalid (0.4.2)
       activesupport (>= 4.2.0)
-    haml (5.1.2)
-      temple (>= 0.8.0)
-      tilt
     hamlit (2.10.0)
       temple (>= 0.8.2)
       thor
@@ -95,11 +91,6 @@ GEM
       activesupport (>= 4.0.1)
       hamlit (>= 1.2.0)
       railties (>= 4.0.1)
-    html2haml (2.2.0)
-      erubis (~> 2.7.0)
-      haml (>= 4.0, < 6)
-      nokogiri (>= 1.6.0)
-      ruby_parser (~> 3.5)
     i18n (1.7.0)
       concurrent-ruby (~> 1.0)
     jbuilder (2.9.1)
@@ -123,7 +114,7 @@ GEM
       kaminari (>= 0.13.0)
       rails
     kaminari-core (1.1.1)
-    libv8 (7.3.492.27.1-x86_64-linux)
+    libv8 (7.3.492.27.1)
     listen (3.1.5)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
@@ -151,7 +142,8 @@ GEM
       byebug (~> 11.0)
       pry (~> 0.10)
     public_suffix (4.0.1)
-    puma (3.12.1)
+    puma (4.3.8)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-proxy (0.6.5)
       rack
@@ -195,8 +187,6 @@ GEM
       tilt
     redis (4.1.3)
     ruby_dep (1.5.0)
-    ruby_parser (3.14.1)
-      sexp_processor (~> 4.9)
     rubyzip (2.0.0)
     sass (3.7.4)
       sass-listen (~> 4.0.0)
@@ -220,7 +210,6 @@ GEM
     selenium-webdriver (3.142.6)
       childprocess (>= 0.5, < 4.0)
       rubyzip (>= 1.2.2)
-    sexp_processor (4.13.0)
     spring (2.1.0)
     spring-watcher-listen (2.0.1)
       listen (>= 2.7, < 4.0)
@@ -269,7 +258,6 @@ DEPENDENCIES
   capybara (~> 2.13)
   coffee-rails (~> 4.2)
   hamlit-rails
-  html2haml
   jbuilder (~> 2.5)
   jquery-rails
   kaminari
@@ -278,7 +266,7 @@ DEPENDENCIES
   mini_racer
   pg (~> 0.20.0)
   pry-byebug
-  puma (~> 3.7)
+  puma (~> 4.3)
   rails (~> 5.1.6)
   rails-i18n
   react-rails