diff --git a/.rubocop.yml b/.rubocop.yml
index d94e546..c8302f4 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -31,5 +31,8 @@ Rails/ApplicationRecord:
   Exclude:
     - 'spec/**/*'
 
-Style/TrailingCommaInLiteral:
+Style/TrailingCommaInHashLiteral:
+  EnforcedStyleForMultiline: comma
+
+Style/TrailingCommaInArrayLiteral:
   EnforcedStyleForMultiline: comma
diff --git a/administrate-field-belongs_to_search.gemspec b/administrate-field-belongs_to_search.gemspec
index 3ff7eb2..d4ea1c9 100755
--- a/administrate-field-belongs_to_search.gemspec
+++ b/administrate-field-belongs_to_search.gemspec
@@ -1,6 +1,4 @@
-# coding: utf-8
-
-lib = File.expand_path('../lib', __FILE__)
+lib = File.expand_path('lib', __dir__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 
 Gem::Specification.new do |gem|