diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 8f62c2e..93032ea 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -27,7 +27,7 @@ jobs:
         # | 6.1   |           |          |   2.5   |     |
         # | 7.0   |           |          |   2.7   |     |
         # | 7.1   |           |          |   2.7   |     |
-        ruby: ['3.0', '3.1', '3.2']
+        ruby: ['3.0', '3.1', '3.2', '3.3']
         gemfile: ['gemfiles/rails_6.1.gemfile', 'gemfiles/rails_7.0.gemfile', 'gemfiles/rails_7.1.gemfile']
         include:
         - ruby: '2.4'
diff --git a/spec/active_hash/base_spec.rb b/spec/active_hash/base_spec.rb
index 8a9a426..f4a4c34 100644
--- a/spec/active_hash/base_spec.rb
+++ b/spec/active_hash/base_spec.rb
@@ -928,7 +928,7 @@ class Region < ActiveHash::Base
         it "raises a NoMethodError" do
           expect {
             Country.find_by_name_and_shoe_size("US", 10)
-          }.to raise_error(NoMethodError, /undefined method `find_by_name_and_shoe_size' (?:for|on) Country/)
+          }.to raise_error(NoMethodError, /undefined method `find_by_name_and_shoe_size' (?:for|on) (class )?Country/)
         end
       end
     end
@@ -957,7 +957,7 @@ class Region < ActiveHash::Base
         it "raises a NoMethodError" do
           expect {
             Country.find_by_name_and_shoe_size!("US", 10)
-          }.to raise_error(NoMethodError, /undefined method `find_by_name_and_shoe_size!' (?:for|on) Country/)
+          }.to raise_error(NoMethodError, /undefined method `find_by_name_and_shoe_size!' (?:for|on) (class )?Country/)
         end
       end
     end
@@ -1181,7 +1181,7 @@ class Region < ActiveHash::Base
     it "doesn't blow up if you call a missing dynamic finder when fields haven't been set" do
       expect do
         Country.find_by_name("Foo")
-      end.to raise_error(NoMethodError, /undefined method `find_by_name' (?:for|on) Country/)
+      end.to raise_error(NoMethodError, /undefined method `find_by_name' (?:for|on) (class )?Country/)
     end
   end