diff --git a/.kokoro/common.cfg b/.kokoro/common.cfg
index 8ca89d179a..3e09e3a430 100644
--- a/.kokoro/common.cfg
+++ b/.kokoro/common.cfg
@@ -12,5 +12,5 @@ build_file: "nodejs-docs-samples/.kokoro/trampoline.sh"
 # Configure the docker image for kokoro-trampoline.
 env_vars: {
     key: "TRAMPOLINE_IMAGE"
-    value: "gcr.io/cloud-docs-samples/nodejs"
+    value: "gcr.io/cloud-devrel-kokoro-resources/node:8-user"
 }
\ No newline at end of file
diff --git a/auth/system-test/auth.test.js b/auth/system-test/auth.test.js
index d84467ff27..ec733e43ba 100644
--- a/auth/system-test/auth.test.js
+++ b/auth/system-test/auth.test.js
@@ -31,5 +31,5 @@ test.serial(`should load credentials implicitly`, async (t) => {
 
 test.serial(`should load credentials explicitly`, async (t) => {
   const output = await tools.runAsync(`${cmd} auth-cloud-explicit`, cwd);
-  t.is(!!output, false);
+  t.is(output.includes(`Buckets:`), true);
 });