diff --git a/administrate-field-belongs_to_search.gemspec b/administrate-field-belongs_to_search.gemspec
old mode 100755
new mode 100644
index 47bf210..5ccc265
--- a/administrate-field-belongs_to_search.gemspec
+++ b/administrate-field-belongs_to_search.gemspec
@@ -21,7 +21,7 @@ Gem::Specification.new do |gem|
 
   gem.add_development_dependency 'coveralls', '~> 0'
   gem.add_development_dependency 'factory_girl', '~> 4.8'
-  gem.add_development_dependency 'rake', '~> 12.0'
+  gem.add_development_dependency 'rake', '~> 13.0'
   gem.add_development_dependency 'rspec', '~> 3.4'
   gem.add_development_dependency 'rubocop', '0.49.0'
   gem.add_development_dependency 'simplecov', '~> 0'