diff --git a/spec/integration/client_side_encryption/custom_endpoint_spec.rb b/spec/integration/client_side_encryption/custom_endpoint_spec.rb
index e810f3ece4..a08605641c 100644
--- a/spec/integration/client_side_encryption/custom_endpoint_spec.rb
+++ b/spec/integration/client_side_encryption/custom_endpoint_spec.rb
@@ -123,7 +123,8 @@
       end
 
       let(:error_regex) do
-        /SocketError: getaddrinfo:/
+        # Ruby 3.3+ raises Socket::ResolutionError here, instead of a bare SocketError
+        /Socket(?:::Resolution)?Error: getaddrinfo:/
       end
 
       it_behaves_like 'raising a KMS error'