diff --git a/packages/google-cloud-build/.github/header-checker-lint.yml b/packages/google-cloud-build/.github/header-checker-lint.yml
new file mode 100644
index 000000000000..fc281c05bd55
--- /dev/null
+++ b/packages/google-cloud-build/.github/header-checker-lint.yml
@@ -0,0 +1,15 @@
+{"allowedCopyrightHolders": ["Google LLC"],
+ "allowedLicenses": ["Apache-2.0", "MIT", "BSD-3"],
+ "ignoreFiles": ["**/requirements.txt", "**/requirements-test.txt"],
+ "sourceFileExtensions": [
+ 	"ts", 
+ 	"js", 
+ 	"java", 
+ 	"sh", 
+ 	"Dockerfile", 
+ 	"yaml", 
+ 	"py",
+ 	"html",
+ 	"txt"
+ ]
+}
\ No newline at end of file
diff --git a/packages/google-cloud-build/.kokoro/build.sh b/packages/google-cloud-build/.kokoro/build.sh
index 185e4aaa01b4..1133b3530604 100755
--- a/packages/google-cloud-build/.kokoro/build.sh
+++ b/packages/google-cloud-build/.kokoro/build.sh
@@ -15,7 +15,11 @@
 
 set -eo pipefail
 
-cd github/python-cloudbuild
+if [[ -z "${PROJECT_ROOT:-}" ]]; then
+    PROJECT_ROOT="github/python-cloudbuild"
+fi
+
+cd "${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-build/.kokoro/docs/docs-presubmit.cfg b/packages/google-cloud-build/.kokoro/docs/docs-presubmit.cfg
index 1118107829b7..77b581aafd8e 100644
--- a/packages/google-cloud-build/.kokoro/docs/docs-presubmit.cfg
+++ b/packages/google-cloud-build/.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-cloudbuild/.kokoro/build.sh"
+}
+
+# Only run this nox session.
+env_vars: {
+    key: "NOX_SESSION"
+    value: "docs docfx"
+}
diff --git a/packages/google-cloud-build/.trampolinerc b/packages/google-cloud-build/.trampolinerc
index 995ee29111e1..383b6ec89fbc 100644
--- a/packages/google-cloud-build/.trampolinerc
+++ b/packages/google-cloud-build/.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-build/noxfile.py b/packages/google-cloud-build/noxfile.py
index a4884a081daa..2c4b84df22c2 100644
--- a/packages/google-cloud-build/noxfile.py
+++ b/packages/google-cloud-build/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):
@@ -75,6 +86,7 @@ def default(session):
     session.install(
         "mock", "pytest", "pytest-cov",
     )
+
     session.install("-e", ".")
 
     # Run py.test against the unit tests.
diff --git a/packages/google-cloud-build/synth.metadata b/packages/google-cloud-build/synth.metadata
index a2f20b5fce77..c4550c92765f 100644
--- a/packages/google-cloud-build/synth.metadata
+++ b/packages/google-cloud-build/synth.metadata
@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/python-cloudbuild.git",
-        "sha": "a917d058405b8bbf87cbe3f01d2ee12b77c46e2c"
+        "sha": "4a2b8571d11fcf63f5e568d3591218e1a2066b5b"
       }
     },
     {
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "41a4e56982620d3edcf110d76f4fcdfdec471ac8"
+        "sha": "d1bb9173100f62c0cfc8f3138b62241e7f47ca6a"
       }
     }
   ],
@@ -41,6 +41,7 @@
     ".github/ISSUE_TEMPLATE/feature_request.md",
     ".github/ISSUE_TEMPLATE/support_request.md",
     ".github/PULL_REQUEST_TEMPLATE.md",
+    ".github/header-checker-lint.yml",
     ".github/release-please.yml",
     ".github/snippet-bot.yml",
     ".gitignore",