Update the version of googleauth to 0.4
diff --git a/src/ruby/grpc.gemspec b/src/ruby/grpc.gemspec
index 45cbacf..a50d035 100755
--- a/src/ruby/grpc.gemspec
+++ b/src/ruby/grpc.gemspec
@@ -22,7 +22,7 @@
s.platform = Gem::Platform::RUBY
s.add_dependency 'google-protobuf', '~> 3.0.0alpha.1.1'
- s.add_dependency 'googleauth', '~> 0.1'
+ s.add_dependency 'googleauth', '~> 0.4'
s.add_dependency 'logging', '~> 1.8'
s.add_dependency 'minitest', '~> 5.4' # reqd for interop tests
s.add_dependency 'xray', '~> 1.1'