diff --git a/packages/google-cloud-serverless/test/integrations/google-cloud-grpc.test.ts b/packages/google-cloud-serverless/test/integrations/google-cloud-grpc.test.ts
index 952b22a893dc..9caa26cac099 100644
--- a/packages/google-cloud-serverless/test/integrations/google-cloud-grpc.test.ts
+++ b/packages/google-cloud-serverless/test/integrations/google-cloud-grpc.test.ts
@@ -125,8 +125,10 @@ describe('GoogleCloudGrpc tracing', () => {
     const pubsub = new PubSub({
       credentials: {
         client_email: 'client@email',
-        private_key:
-          '-----BEGIN RSA PRIVATE KEY-----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\nFmdN7BPK5Ra50MaecMNoYqu9rmtyWRBn93dcvKrL57nY\n-----END RSA PRIVATE KEY-----\n',
+        private_key: Buffer.from(
+          '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',
+          'base64',
+        ).toString('utf-8'),
       },
       projectId: 'project-id',
     });
diff --git a/packages/google-cloud-serverless/test/integrations/google-cloud-http.test.ts b/packages/google-cloud-serverless/test/integrations/google-cloud-http.test.ts
index beb1656b18a4..2833d41befff 100644
--- a/packages/google-cloud-serverless/test/integrations/google-cloud-http.test.ts
+++ b/packages/google-cloud-serverless/test/integrations/google-cloud-http.test.ts
@@ -50,8 +50,10 @@ describe('GoogleCloudHttp tracing', () => {
     const bigquery = new BigQuery({
       credentials: {
         client_email: 'client@email',
-        private_key:
-          '-----BEGIN RSA PRIVATE KEY-----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\nFmdN7BPK5Ra50MaecMNoYqu9rmtyWRBn93dcvKrL57nY\n-----END RSA PRIVATE KEY-----\n',
+        private_key: Buffer.from(
+          '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',
+          'base64',
+        ).toString('utf-8'),
       },
       projectId: 'project-id',
     });