diff --git a/spec/rubocop/cop/thread_safety/mutable_class_instance_variable_spec.rb b/spec/rubocop/cop/thread_safety/mutable_class_instance_variable_spec.rb
index 5927aed..bc6346b 100644
--- a/spec/rubocop/cop/thread_safety/mutable_class_instance_variable_spec.rb
+++ b/spec/rubocop/cop/thread_safety/mutable_class_instance_variable_spec.rb
@@ -282,7 +282,7 @@ def some_method
             it_behaves_like 'mutable objects', %("\#{a}")
           end
 
-          context 'when the frozen_string_literal comment is true' do
+          context 'when the frozen_string_literal comment is true', unsupported_on: :prism do
             let(:prefix) { "# frozen_string_literal: true\n#{super()}" }
 
             it_behaves_like 'immutable objects', %("\#{a}")
@@ -605,7 +605,7 @@ def assignment?
             it_behaves_like 'mutable objects', %("\#{a}")
           end
 
-          context 'when the frozen_string_literal comment is true' do
+          context 'when the frozen_string_literal comment is true', unsupported_on: :prism do
             let(:prefix) { "# frozen_string_literal: true\n#{super()}" }
 
             it_behaves_like 'immutable objects', %("\#{a}")
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 23c2711..be1363f 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -39,6 +39,8 @@
     config.fail_fast = ENV.key? 'RSPEC_FAIL_FAST'
   end
 
+  config.filter_run_excluding unsupported_on: :prism if ENV['PARSER_ENGINE'] == 'parser_prism'
+
   config.disable_monkey_patching!
 
   config.order = :random