update Google.Apis.Auth to 1.16.0 for project.json projects
diff --git a/src/csharp/Grpc.Auth/project.json b/src/csharp/Grpc.Auth/project.json
index 30f0944..19691cf 100644
--- a/src/csharp/Grpc.Auth/project.json
+++ b/src/csharp/Grpc.Auth/project.json
@@ -23,7 +23,7 @@
   },
   "dependencies": {
     "Grpc.Core": "1.1.0-dev",
-    "Google.Apis.Auth": "1.15.0"
+    "Google.Apis.Auth": "1.16.0"
   },
   "frameworks": {
     "net45": { },
diff --git a/templates/src/csharp/Grpc.Auth/project.json.template b/templates/src/csharp/Grpc.Auth/project.json.template
index 19d4b42..39b201f 100644
--- a/templates/src/csharp/Grpc.Auth/project.json.template
+++ b/templates/src/csharp/Grpc.Auth/project.json.template
@@ -25,7 +25,7 @@
     },
     "dependencies": {
       "Grpc.Core": "${settings.csharp_version}",
-      "Google.Apis.Auth": "1.15.0"
+      "Google.Apis.Auth": "1.16.0"
     },
     "frameworks": {
       "net45": { },