diff --git a/google-cloud-spanner/benchmark/benchwrapper/benchwrapper.rb b/google-cloud-spanner/benchmark/benchwrapper/benchwrapper.rb
index b3c701ec..f285b6d3 100755
--- a/google-cloud-spanner/benchmark/benchwrapper/benchwrapper.rb
+++ b/google-cloud-spanner/benchmark/benchwrapper/benchwrapper.rb
@@ -86,7 +86,7 @@ def main
   end
 
   addr = "0.0.0.0:#{port}"
-  s = GRPC::RpcServer.new pool_size: 80
+  s = GRPC::RpcServer.new pool_size: 120
   s.add_http2_port(addr, :this_port_is_insecure)
   puts "starting benchwrapper for Spanner on localhost:#{addr}"
   s.handle(ServerImpl.new)
@@ -96,4 +96,4 @@ def main
   s.run_till_terminated_or_interrupted([1, 'int', 'SIGQUIT'])
 end
 
-main
\ No newline at end of file
+main