Update sites using ServerCredentials.new
diff --git a/src/ruby/bin/math_server.rb b/src/ruby/bin/math_server.rb
index b41ccf6..5e2b7e7 100755
--- a/src/ruby/bin/math_server.rb
+++ b/src/ruby/bin/math_server.rb
@@ -155,7 +155,8 @@
 
 def test_server_creds
   certs = load_test_certs
-  GRPC::Core::ServerCredentials.new(nil, certs[1], certs[2])
+  GRPC::Core::ServerCredentials.new(
+    nil, [{ private_key: certs[1], cert_chain: certs[2] }], false)
 end
 
 def main