diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 6aedabf4c..7d53766ab 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -14,6 +14,7 @@ jobs:
       matrix:
         rails_version: [8.0.1]
         ruby: ["3.4"]
+        bundler_version: ["2.7.2"]
         additional_engine_cart_rails_options: [""]
         additional_name: [""]
         include:
@@ -21,20 +22,17 @@ jobs:
             rails_version: 7.2.2.1
           - ruby: "3.2"
             rails_version: 7.1.5.1
-          - ruby: "3.4"
-            rails_version: "8.0.1"
-            blacklight_version: 9.0.0.beta1
-            additional_name: "/ Blacklight 9"
     env:
       RAILS_VERSION: ${{ matrix.rails_version }}
       ENGINE_CART_RAILS_OPTIONS: "--skip-git --skip-listen --skip-spring --skip-keeps --skip-kamal --skip-solid --skip-coffee --skip-test --css bootstrap -a propshaft -j importmap ${{ matrix.additional_engine_cart_rails_options }}"
       BLACKLIGHT_VERSION: ${{ matrix.blacklight_version }}
+      BUNDLER_VERSION: ${{ matrix.bundler_version || '2.7.2' }}
     steps:
       - uses: actions/checkout@v4
       - name: Set up Ruby ${{ matrix.ruby }}
         uses: ruby/setup-ruby@v1
         with:
-          bundler: latest
+          bundler: ${{ matrix.bundler_version || '2.7.2' }}
           ruby-version: ${{ matrix.ruby }}
       - name: Install dependencies with Rails ${{ matrix.rails_version }}
         run: bundle install
@@ -48,7 +46,7 @@ jobs:
       - name: Install Ruby and gems
         uses: ruby/setup-ruby@v1
         with:
-          bundler: latest
+          bundler: ${{ matrix.bundler_version || '2.7.2' }}
           ruby-version: 3.2
       - name: Install dependencies with Bundler
         run: bundle install
diff --git a/Gemfile b/Gemfile
index 7ba56d256..dd4a375e0 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@
 source 'https://rubygems.org'
 
 # Specify your gem's dependencies in arclight.gemspec
-gemspec
+gemspec path: File.expand_path(__dir__)
 
 # BEGIN ENGINE_CART BLOCK
 # engine_cart: 2.5.0
diff --git a/app/helpers/arclight/ead_format_helpers.rb b/app/helpers/arclight/ead_format_helpers.rb
index 9511c2545..2ca1bae30 100644
--- a/app/helpers/arclight/ead_format_helpers.rb
+++ b/app/helpers/arclight/ead_format_helpers.rb
@@ -258,7 +258,7 @@ def format_indexes(node)
       index_head = node.at_css('head')
       index_head&.name = 'h3'
       index_head&.add_class('index-head')
-      index_head['id'] = ['index-', index_head.text].join.parameterize if index_head.present?
+      index_head.presence&.[]=('id', ['index-', index_head.text].join.parameterize)
       format_indexentries(node)
       node.name = 'div'
     end
diff --git a/arclight.gemspec b/arclight.gemspec
index 7fff58ad3..31abe11be 100644
--- a/arclight.gemspec
+++ b/arclight.gemspec
@@ -24,7 +24,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
-  spec.add_dependency 'blacklight', '>= 8.0.0', '< 10'
+  spec.add_dependency 'blacklight', '>= 8.0.0', '< 9'
   spec.add_dependency 'gretel'
   spec.add_dependency 'rails', '>= 7.1', '< 9'
   spec.add_dependency 'traject', '~> 3.0'
diff --git a/spec/test_app_templates/lib/generators/test_app_generator.rb b/spec/test_app_templates/lib/generators/test_app_generator.rb
index 8d5cca0d5..a3b84f69e 100644
--- a/spec/test_app_templates/lib/generators/test_app_generator.rb
+++ b/spec/test_app_templates/lib/generators/test_app_generator.rb
@@ -11,7 +11,7 @@ class TestAppGenerator < Rails::Generators::Base
   # after setting up the application
 
   def add_gems
-    Bundler.with_clean_env do
+    Bundler.with_unbundled_env do
       run 'bundle install'
     end
   end