diff --git a/.github/.OwlBot.lock.yaml b/.github/.OwlBot.lock.yaml
index e4e943e025..af879fdecd 100644
--- a/.github/.OwlBot.lock.yaml
+++ b/.github/.OwlBot.lock.yaml
@@ -13,5 +13,5 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-python:latest
-  digest: sha256:98f3afd11308259de6e828e37376d18867fd321aba07826e29e4f8d9cab56bad
-# created: 2024-02-27T15:56:18.442440378Z
+  digest: sha256:007e7e46ef05e5a32e652bd0062be02f6ff050347d91e0f357b28caab0a042c4
+# created: 2024-03-15T14:27:15.879623611Z
diff --git a/.kokoro/build.sh b/.kokoro/build.sh
index b278d3723f..635c5f45d3 100755
--- a/.kokoro/build.sh
+++ b/.kokoro/build.sh
@@ -33,16 +33,6 @@ export GOOGLE_APPLICATION_CREDENTIALS=${KOKORO_GFILE_DIR}/service-account.json
 # Setup project id.
 export PROJECT_ID=$(cat "${KOKORO_GFILE_DIR}/project-id.json")
 
-# Set up creating a new instance for each system test run
-export GOOGLE_CLOUD_TESTS_CREATE_SPANNER_INSTANCE=true
-
-# Remove old nox
-python3 -m pip uninstall --yes --quiet nox-automation
-
-# Install nox
-python3 -m pip install --upgrade --quiet nox
-python3 -m nox --version
-
 # If this is a continuous build, send the test log to the FlakyBot.
 # See https://github.com/googleapis/repo-automation-bots/tree/main/packages/flakybot.
 if [[ $KOKORO_BUILD_ARTIFACTS_SUBDIR = *"continuous"* ]]; then