diff --git a/packages/google-cloud-bigquery-datatransfer/.kokoro/build.sh b/packages/google-cloud-bigquery-datatransfer/.kokoro/build.sh
index bf3d0a68a20b..ab066b757857 100755
--- a/packages/google-cloud-bigquery-datatransfer/.kokoro/build.sh
+++ b/packages/google-cloud-bigquery-datatransfer/.kokoro/build.sh
@@ -15,7 +15,11 @@
 
 set -eo pipefail
 
-cd github/python-bigquery-datatransfer
+if [[ -z "${PROJECT_ROOT:-}" ]]; then
+    PROJECT_ROOT="github/python-bigquery-datatransfer"
+fi
+
+cd "${PROJECT_ROOT}"
 
 # Disable buffering, so that the logs stream through.
 export PYTHONUNBUFFERED=1
@@ -30,16 +34,16 @@ export GOOGLE_APPLICATION_CREDENTIALS=${KOKORO_GFILE_DIR}/service-account.json
 export PROJECT_ID=$(cat "${KOKORO_GFILE_DIR}/project-id.json")
 
 # Remove old nox
-python3.6 -m pip uninstall --yes --quiet nox-automation
+python3 -m pip uninstall --yes --quiet nox-automation
 
 # Install nox
-python3.6 -m pip install --upgrade --quiet nox
-python3.6 -m nox --version
+python3 -m pip install --upgrade --quiet nox
+python3 -m nox --version
 
 # If NOX_SESSION is set, it only runs the specified session,
 # otherwise run all the sessions.
 if [[ -n "${NOX_SESSION:-}" ]]; then
-    python3.6 -m nox -s "${NOX_SESSION:-}"
+    python3 -m nox -s ${NOX_SESSION:-}
 else
-    python3.6 -m nox
+    python3 -m nox
 fi
diff --git a/packages/google-cloud-bigquery-datatransfer/.kokoro/docs/docs-presubmit.cfg b/packages/google-cloud-bigquery-datatransfer/.kokoro/docs/docs-presubmit.cfg
index 1118107829b7..1d1744321f39 100644
--- a/packages/google-cloud-bigquery-datatransfer/.kokoro/docs/docs-presubmit.cfg
+++ b/packages/google-cloud-bigquery-datatransfer/.kokoro/docs/docs-presubmit.cfg
@@ -15,3 +15,14 @@ env_vars: {
     key: "TRAMPOLINE_IMAGE_UPLOAD"
     value: "false"
 }
+
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/python-bigquery-datatransfer/.kokoro/build.sh"
+}
+
+# Only run this nox session.
+env_vars: {
+    key: "NOX_SESSION"
+    value: "docs docfx"
+}
diff --git a/packages/google-cloud-bigquery-datatransfer/.trampolinerc b/packages/google-cloud-bigquery-datatransfer/.trampolinerc
index 995ee29111e1..383b6ec89fbc 100644
--- a/packages/google-cloud-bigquery-datatransfer/.trampolinerc
+++ b/packages/google-cloud-bigquery-datatransfer/.trampolinerc
@@ -24,6 +24,7 @@ required_envvars+=(
 pass_down_envvars+=(
     "STAGING_BUCKET"
     "V2_STAGING_BUCKET"
+    "NOX_SESSION"
 )
 
 # Prevent unintentional override on the default image.
diff --git a/packages/google-cloud-bigquery-datatransfer/noxfile.py b/packages/google-cloud-bigquery-datatransfer/noxfile.py
index a4884a081daa..32a8bcfa5f9d 100644
--- a/packages/google-cloud-bigquery-datatransfer/noxfile.py
+++ b/packages/google-cloud-bigquery-datatransfer/noxfile.py
@@ -30,6 +30,17 @@
 SYSTEM_TEST_PYTHON_VERSIONS = ["3.8"]
 UNIT_TEST_PYTHON_VERSIONS = ["3.6", "3.7", "3.8", "3.9"]
 
+# 'docfx' is excluded since it only needs to run in 'docs-presubmit'
+nox.options.sessions = [
+    "unit",
+    "system",
+    "cover",
+    "lint",
+    "lint_setup_py",
+    "blacken",
+    "docs",
+]
+
 
 @nox.session(python=DEFAULT_PYTHON_VERSION)
 def lint(session):
diff --git a/packages/google-cloud-bigquery-datatransfer/synth.metadata b/packages/google-cloud-bigquery-datatransfer/synth.metadata
index 84f637d78430..be4f26dcf7e9 100644
--- a/packages/google-cloud-bigquery-datatransfer/synth.metadata
+++ b/packages/google-cloud-bigquery-datatransfer/synth.metadata
@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/python-bigquery-datatransfer.git",
-        "sha": "50d8d0b88f634bc3f9093e407f320299d8b7db55"
+        "sha": "5c8d7c1e860d1c50d892bfabc7ec936aaa40e714"
       }
     },
     {
@@ -19,14 +19,14 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "41a4e56982620d3edcf110d76f4fcdfdec471ac8"
+        "sha": "16ec872dd898d7de6e1822badfac32484b5d9031"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "41a4e56982620d3edcf110d76f4fcdfdec471ac8"
+        "sha": "16ec872dd898d7de6e1822badfac32484b5d9031"
       }
     }
   ],