diff --git a/vendor/google.golang.org/grpc/.travis.yml b/vendor/google.golang.org/grpc/.travis.yml
index 87f40b8..a11e8cb 100644
--- a/vendor/google.golang.org/grpc/.travis.yml
+++ b/vendor/google.golang.org/grpc/.travis.yml
@@ -11,7 +11,7 @@
   - go: 1.13.x
     env: GRPC_GO_RETRY=on
   - go: 1.13.x
-    env: TESTEXAMPLES=1
+    env: TESTEXTRAS=1
   - go: 1.12.x
     env: GO111MODULE=on
   - go: 1.11.x
@@ -35,7 +35,7 @@
 
 script:
   - set -e
-  - if [[ -n "${TESTEXAMPLES}" ]]; then examples/examples_test.sh; exit 0; fi
+  - if [[ -n "${TESTEXTRAS}" ]]; then examples/examples_test.sh; interop/interop_test.sh; make testsubmodule; exit 0; fi
   - if [[ -n "${VET}" ]]; then ./vet.sh; fi
   - if [[ -n "${GAE}" ]]; then make testappengine; exit 0; fi
   - if [[ -n "${RACE}" ]]; then make testrace; exit 0; fi