diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index f74e66f..4e0330a 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -6,7 +6,7 @@ jobs:
   rubocop:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Set up Ruby and install dependencies
       uses: ruby/setup-ruby@v1
       with:
@@ -22,7 +22,7 @@ jobs:
         ruby: [3.1, 3.2, 3.3]
         faraday_version: ['', '~> 1.0'] # Defaults to whatever's the most recent version.
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
 
     - name: Set up Ruby and install dependencies
       uses: ruby/setup-ruby@v1
@@ -32,13 +32,13 @@ jobs:
       env:
         FARADAY_VERSION: ${{ matrix.faraday_version }}
 
-    - name: Run tests
+    - name: "Run tests for Ruby ${{ matrix.ruby }} and Faraday ${{ matrix.faraday_version == '~> 1.0' && '1.x' || 'latest' }}"
       run: bundle exec rake spec
       env:
         FARADAY_VERSION: ${{ matrix.faraday_version }}
 
     - name: Upload coverage artifacts
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       with:
-        name: coverage
+        name: "coverage-${{ matrix.ruby }}-${{ matrix.faraday_version == '~> 1.0' && 'faraday-1.x' || 'faraday-latest' }}"
         path: coverage/
diff --git a/.rubocop.yml b/.rubocop.yml
index 8d67881..89f96bd 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,5 +1,7 @@
 require:
   - rubocop-rspec
+
+plugins:
   - rubocop-rake
 
 inherit_from: .rubocop_todo.yml
diff --git a/geo_combine.gemspec b/geo_combine.gemspec
index fc62969..4dfc266 100644
--- a/geo_combine.gemspec
+++ b/geo_combine.gemspec
@@ -32,8 +32,8 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rake'
   spec.add_development_dependency 'rspec'
   spec.add_development_dependency 'rspec-html-matchers'
-  spec.add_development_dependency 'rubocop', '~> 1.25'
-  spec.add_development_dependency 'rubocop-rspec', '~> 2.8'
+  spec.add_development_dependency 'rubocop'
+  spec.add_development_dependency 'rubocop-rspec'
   spec.add_development_dependency 'rubocop-rake'
   spec.add_development_dependency 'simplecov'
   spec.add_development_dependency 'webmock', '~> 3.14'
diff --git a/lib/geo_combine/ckan_metadata.rb b/lib/geo_combine/ckan_metadata.rb
index 4c2df6a..17c60c8 100644
--- a/lib/geo_combine/ckan_metadata.rb
+++ b/lib/geo_combine/ckan_metadata.rb
@@ -32,7 +32,7 @@ def geoblacklight_terms
         layer_slug_s: @metadata['name'],
         solr_geom: envelope,
         dc_subject_sm: subjects,
-        dct_references_s: external_references.to_json.to_s,
+        dct_references_s: external_references.to_json,
         dc_format_s: downloadable? ? 'ZIP' : nil # TODO: we only allow direct ZIP file downloads
       }.compact
     end
diff --git a/lib/geo_combine/ogp.rb b/lib/geo_combine/ogp.rb
index 610ef8b..50ba397 100644
--- a/lib/geo_combine/ogp.rb
+++ b/lib/geo_combine/ogp.rb
@@ -123,7 +123,7 @@ def references
     # Builds a Solr Envelope using CQL syntax
     # @return [String]
     def envelope
-      raise ArgumentError unless west >= -180 && west <= 180 &&
+      raise ArgumentError unless west.between?(-180, 180) &&
                                  east >= -180 && east <= 180 &&
                                  north >= -90 && north <= 90 &&
                                  south >= -90 && south <= 90 &&
@@ -144,6 +144,15 @@ def fgdc
       GeoCombine::Fgdc.new(metadata['FgdcText']) if metadata['FgdcText']
     end
 
+    SLUG_STRIP_VALUES = %w[
+      SDE_DATA.
+      SDE.
+      SDE2.
+      GISPORTAL.GISOWNER01.
+      GISDATA.
+      MORIS.
+    ].freeze
+
     private
 
     ##
@@ -207,15 +216,6 @@ def slug
       sluggify(filter_name(name))
     end
 
-    SLUG_STRIP_VALUES = %w[
-      SDE_DATA.
-      SDE.
-      SDE2.
-      GISPORTAL.GISOWNER01.
-      GISDATA.
-      MORIS.
-    ].freeze
-
     def filter_name(name)
       # strip out schema and usernames
       SLUG_STRIP_VALUES.each do |strip_val|