diff --git a/lib/tasks/manifest.rake b/lib/tasks/manifest.rake
index 771db43..7403c6e 100644
--- a/lib/tasks/manifest.rake
+++ b/lib/tasks/manifest.rake
@@ -12,7 +12,7 @@ namespace :manifest do
   end
 
   def manifest_files
-    File.open("Manifest.txt").readlines.map(&:chomp)
+    File.readlines("Manifest.txt").map(&:chomp)
   end
 
   desc "Create manifest"
diff --git a/publify_textfilter_code.gemspec b/publify_textfilter_code.gemspec
index f007faf..9a892c2 100644
--- a/publify_textfilter_code.gemspec
+++ b/publify_textfilter_code.gemspec
@@ -14,7 +14,7 @@ Gem::Specification.new do |s|
   s.description = "Code text filter sidebar for the Publify blogging system."
   s.license     = "MIT"
 
-  s.files       = File.open("Manifest.txt").readlines.map(&:chomp)
+  s.files       = File.readlines("Manifest.txt").map(&:chomp)
 
   s.required_ruby_version = ">= 3.2.0"
 
@@ -24,7 +24,7 @@ Gem::Specification.new do |s|
 
   s.add_development_dependency "appraisal", "~> 2.3"
   s.add_development_dependency "rspec-rails", "~> 7.1"
-  s.add_development_dependency "rubocop", "~> 1.82.1"
+  s.add_development_dependency "rubocop", "~> 1.86.0"
   s.add_development_dependency "rubocop-capybara", "~> 2.22.1"
   s.add_development_dependency "rubocop-factory_bot", "~> 2.28.0"
   s.add_development_dependency "rubocop-performance", "~> 1.26.1"