diff --git a/ruby/.ruby-version b/ruby/.ruby-version
deleted file mode 100644
index 75a22a2..0000000
--- a/ruby/.ruby-version
+++ /dev/null
@@ -1 +0,0 @@
-3.0.3
diff --git a/ruby/create_volume.rb b/ruby/create_volume.rb
index 74063fd..e5d6e8d 100755
--- a/ruby/create_volume.rb
+++ b/ruby/create_volume.rb
@@ -82,7 +82,7 @@
 
 # Write the papers
 directory_name = "_posts"
-Dir.mkdir(directory_name) unless File.exists?(directory_name)
+Dir.mkdir(directory_name) unless File.exist?(directory_name)
 MLResearch.extractpapers(bib_file, volume_no, volume_info, software_file, video_file, supp_file, supp_name)  
 out = File.open('index.html', 'w')
 out.puts "---"
diff --git a/ruby/mlresearch.rb b/ruby/mlresearch.rb
index 2928672..fb4254e 100644
--- a/ruby/mlresearch.rb
+++ b/ruby/mlresearch.rb
@@ -358,7 +358,7 @@ def self.extractpapers(bib_file, volume_no, volume_info, software_file=nil, vide
         ha['pdf'] = 'https://proceedings.mlr.press' + '/' + volume_info['volume_dir'] + '/' + ha['id'] + '.pdf'
       else
         if File.file?(ha['id'] + '.pdf')
-          Dir.mkdir(filestub) unless File.exists?(filestub)
+          Dir.mkdir(filestub) unless File.exist?(filestub)
           if not File.file?(filestub + '/' + filestub + '.pdf')
             FileUtils.mv(ha['id'] + '.pdf', filestub + '/' + filestub + '.pdf')
           end