--- a/Rakefile
+++ b/Rakefile
@@ -1,8 +1,6 @@
-require 'bundler/gem_tasks'
 require 'rake/clean'
 require 'rake/extensiontask'
 require 'rspec/core/rake_task'
-require 'rubocop/rake_task'
 require 'open-uri'
 
 LIB_PG_QUERY_TAG = '13-2.0.4'.freeze
@@ -13,7 +11,6 @@
 end
 
 RSpec::Core::RakeTask.new
-RuboCop::RakeTask.new
 
 task spec: :compile
 
@@ -86,11 +86,13 @@
   system("cp -a #{libdir}/testdata/* #{testfilesdir}")
   # Copy back the custom ext files
   system("cp -a #{extbakdir}/pg_query_ruby.{c,sym} #{extbakdir}/extconf.rb #{extdir}")
+end
 
+task :update_json_field_names do
   # Generate JSON field name helper (workaround until https://github.com/protocolbuffers/protobuf/pull/8356 is merged)
   str = "module PgQuery\n  INTERNAL_PROTO_FIELD_NAME_TO_JSON_NAME = {\n"
   cur_type = nil
-  File.read(File.join(libdir, 'protobuf/pg_query.proto')).each_line do |line|
+  File.read('/usr/include/pg_query/pg_query.proto').each_line do |line|
     if line[/^message (\w+)/]
       cur_type = $1
       next