diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 9bf1d5eb58..dc05b23805 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -46,7 +46,7 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@afeafc3d1ab54a631816aba4c914a0081c12ff2f # v1.310.0
         with:
-          ruby-version: 3.4
+          ruby-version: 4.0
       - name: Install ruby dependencies
         run: bundle install --jobs 4 --retry 3
       - name: Validate YAML
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index ab66791556..885d3fff1c 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,3 +1,11 @@
+require 'strscan'
+
+class StringScanner
+  def peep(len)
+    peek(len)
+  end
+end
+
 require 'date'
 require 'kwalify'
 require 'rspec'