diff --git a/aggregate_root/spec/instrumented_apply_strategy_spec.rb b/aggregate_root/spec/instrumented_apply_strategy_spec.rb
index c1ffbd8cef..45b9b71420 100644
--- a/aggregate_root/spec/instrumented_apply_strategy_spec.rb
+++ b/aggregate_root/spec/instrumented_apply_strategy_spec.rb
@@ -57,7 +57,7 @@ module AggregateRoot
       expect(instrumented_strategy).not_to respond_to(:arbitrary_method_name)
       expect do
         instrumented_strategy.arbitrary_method_name
-      end.to raise_error(NoMethodError, /undefined method `arbitrary_method_name' for #<AggregateRoot::InstrumentedApplyStrategy:/)
+      end.to raise_error(NoMethodError, /undefined method `arbitrary_method_name'/)
     end
 
     def subscribe_to(name)
diff --git a/aggregate_root/spec/instrumented_repository_spec.rb b/aggregate_root/spec/instrumented_repository_spec.rb
index 344723482f..57a12175d9 100644
--- a/aggregate_root/spec/instrumented_repository_spec.rb
+++ b/aggregate_root/spec/instrumented_repository_spec.rb
@@ -137,7 +137,7 @@ def apply_order_expired(_event)
       expect(instrumented_repository).not_to respond_to(:arbitrary_method_name)
       expect { instrumented_repository.arbitrary_method_name }.to raise_error(
         NoMethodError,
-        /undefined method `arbitrary_method_name' for #<AggregateRoot::InstrumentedRepository:/
+        /undefined method `arbitrary_method_name' for .+AggregateRoot::InstrumentedRepository/
       )
     end
 
diff --git a/ruby_event_store/spec/instrumented_dispatcher_spec.rb b/ruby_event_store/spec/instrumented_dispatcher_spec.rb
index aa1c0a4e47..0c5a756c5b 100644
--- a/ruby_event_store/spec/instrumented_dispatcher_spec.rb
+++ b/ruby_event_store/spec/instrumented_dispatcher_spec.rb
@@ -66,7 +66,7 @@ module RubyEventStore
       expect(instrumented_dispatcher).not_to respond_to(:arbitrary_method_name)
       expect { instrumented_dispatcher.arbitrary_method_name }.to raise_error(
         NoMethodError,
-        /undefined method `arbitrary_method_name' for #<RubyEventStore::InstrumentedDispatcher:/
+        /undefined method `arbitrary_method_name' for .+RubyEventStore::InstrumentedDispatcher/
       )
     end
 
diff --git a/ruby_event_store/spec/instrumented_repository_spec.rb b/ruby_event_store/spec/instrumented_repository_spec.rb
index e793271630..c95b2add32 100644
--- a/ruby_event_store/spec/instrumented_repository_spec.rb
+++ b/ruby_event_store/spec/instrumented_repository_spec.rb
@@ -188,7 +188,7 @@ module RubyEventStore
       expect(instrumented_repository).not_to respond_to(:arbitrary_method_name)
       expect { instrumented_repository.arbitrary_method_name }.to raise_error(
         NoMethodError,
-        /undefined method `arbitrary_method_name' for #<RubyEventStore::InstrumentedRepository:/
+        /undefined method `arbitrary_method_name' for .+RubyEventStore::InstrumentedRepository/
       )
     end
 
diff --git a/ruby_event_store/spec/instrumented_subscriptions_spec.rb b/ruby_event_store/spec/instrumented_subscriptions_spec.rb
index bf897c87a3..c6ee32466e 100644
--- a/ruby_event_store/spec/instrumented_subscriptions_spec.rb
+++ b/ruby_event_store/spec/instrumented_subscriptions_spec.rb
@@ -147,7 +147,7 @@ module RubyEventStore
       expect(instrumented_subscriptions).not_to respond_to(:arbitrary_method_name)
       expect do
         instrumented_subscriptions.arbitrary_method_name
-      end.to raise_error(NoMethodError, /undefined method `arbitrary_method_name' for #<RubyEventStore::InstrumentedSubscriptions:/)
+      end.to raise_error(NoMethodError, /undefined method `arbitrary_method_name' for .+RubyEventStore::InstrumentedSubscriptions/)
     end
 
     def subscribe_to(name)