diff --git a/packages/google-cloud-bigquery-datatransfer/.github/.OwlBot.lock.yaml b/packages/google-cloud-bigquery-datatransfer/.github/.OwlBot.lock.yaml
index 58fcbeeed649..0eb02fda4c09 100644
--- a/packages/google-cloud-bigquery-datatransfer/.github/.OwlBot.lock.yaml
+++ b/packages/google-cloud-bigquery-datatransfer/.github/.OwlBot.lock.yaml
@@ -13,5 +13,5 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-python:latest
-  digest: sha256:c8878270182edaab99f2927969d4f700c3af265accd472c3425deedff2b7fd93
-# created: 2022-07-14T01:58:16.015625351Z
+  digest: sha256:9db98b055a7f8bd82351238ccaacfd3cda58cdf73012ab58b8da146368330021
+# created: 2022-07-25T16:02:49.174178716Z
diff --git a/packages/google-cloud-bigquery-datatransfer/noxfile.py b/packages/google-cloud-bigquery-datatransfer/noxfile.py
index 94b2f9c20760..cc39f3b89424 100644
--- a/packages/google-cloud-bigquery-datatransfer/noxfile.py
+++ b/packages/google-cloud-bigquery-datatransfer/noxfile.py
@@ -334,7 +334,8 @@ def prerelease_deps(session):
 
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
-    session.install(*UNIT_TEST_STANDARD_DEPENDENCIES)
+    unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
+    session.install(*unit_deps_all)
     system_deps_all = (
         SYSTEM_TEST_STANDARD_DEPENDENCIES
         + SYSTEM_TEST_EXTERNAL_DEPENDENCIES
@@ -363,12 +364,6 @@ def prerelease_deps(session):
 
     session.install(*constraints_deps)
 
-    if os.path.exists("samples/snippets/requirements.txt"):
-        session.install("-r", "samples/snippets/requirements.txt")
-
-    if os.path.exists("samples/snippets/requirements-test.txt"):
-        session.install("-r", "samples/snippets/requirements-test.txt")
-
     prerel_deps = [
         "protobuf",
         # dependency of grpc
@@ -405,11 +400,19 @@ def prerelease_deps(session):
     system_test_folder_path = os.path.join("tests", "system")
 
     # Only run system tests if found.
-    if os.path.exists(system_test_path) or os.path.exists(system_test_folder_path):
-        session.run("py.test", "tests/system")
-
-    snippets_test_path = os.path.join("samples", "snippets")
-
-    # Only run samples tests if found.
-    if os.path.exists(snippets_test_path):
-        session.run("py.test", "samples/snippets")
+    if os.path.exists(system_test_path):
+        session.run(
+            "py.test",
+            "--verbose",
+            f"--junitxml=system_{session.python}_sponge_log.xml",
+            system_test_path,
+            *session.posargs,
+        )
+    if os.path.exists(system_test_folder_path):
+        session.run(
+            "py.test",
+            "--verbose",
+            f"--junitxml=system_{session.python}_sponge_log.xml",
+            system_test_folder_path,
+            *session.posargs,
+        )