diff --git a/.github/.OwlBot.lock.yaml b/.github/.OwlBot.lock.yaml
index 0b520b9c..6301519a 100644
--- a/.github/.OwlBot.lock.yaml
+++ b/.github/.OwlBot.lock.yaml
@@ -13,6 +13,5 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-python:latest
-  digest: sha256:e8dcfd7cbfd8beac3a3ff8d3f3185287ea0625d859168cc80faccfc9a7a00455
-# created: 2024-09-16T21:04:09.091105552Z
-
+  digest: sha256:2ed982f884312e4883e01b5ab8af8b6935f0216a5a2d82928d273081fc3be562
+# created: 2024-11-12T12:09:45.821174897Z
diff --git a/.kokoro/docs/common.cfg b/.kokoro/docs/common.cfg
index 5f403c75..a1b0030a 100644
--- a/.kokoro/docs/common.cfg
+++ b/.kokoro/docs/common.cfg
@@ -30,9 +30,9 @@ env_vars: {
 
 env_vars: {
     key: "V2_STAGING_BUCKET"
-    # Push non-cloud library docs to `docs-staging-v2-staging` instead of the
+    # Push non-cloud library docs to `docs-staging-v2-dev` instead of the
     # Cloud RAD bucket `docs-staging-v2`
-    value: "docs-staging-v2-staging"
+    value: "docs-staging-v2-dev"
 }
 
 # It will upload the docker image after successful builds.
@@ -64,4 +64,4 @@ before_action {
       keyname: "docuploader_service_account"
     }
   }
-}
\ No newline at end of file
+}
diff --git a/.kokoro/samples/python3.13/common.cfg b/.kokoro/samples/python3.13/common.cfg
new file mode 100644
index 00000000..36980416
--- /dev/null
+++ b/.kokoro/samples/python3.13/common.cfg
@@ -0,0 +1,40 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Build logs will be here
+action {
+  define_artifacts {
+    regex: "**/*sponge_log.xml"
+  }
+}
+
+# Specify which tests to run
+env_vars: {
+    key: "RUN_TESTS_SESSION"
+    value: "py-3.13"
+}
+
+# Declare build specific Cloud project.
+env_vars: {
+    key: "BUILD_SPECIFIC_GCLOUD_PROJECT"
+    value: "python-docs-samples-tests-313"
+}
+
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/google-cloudevents-python/.kokoro/test-samples.sh"
+}
+
+# Configure the docker image for kokoro-trampoline.
+env_vars: {
+    key: "TRAMPOLINE_IMAGE"
+    value: "gcr.io/cloud-devrel-kokoro-resources/python-samples-testing-docker"
+}
+
+# Download secrets for samples
+gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/python-docs-samples"
+
+# Download trampoline resources.
+gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/trampoline"
+
+# Use the trampoline script to run in docker.
+build_file: "google-cloudevents-python/.kokoro/trampoline_v2.sh"
diff --git a/.kokoro/samples/python3.13/continuous.cfg b/.kokoro/samples/python3.13/continuous.cfg
new file mode 100644
index 00000000..a1c8d975
--- /dev/null
+++ b/.kokoro/samples/python3.13/continuous.cfg
@@ -0,0 +1,6 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+env_vars: {
+    key: "INSTALL_LIBRARY_FROM_SOURCE"
+    value: "True"
+}
\ No newline at end of file
diff --git a/.kokoro/samples/python3.13/periodic-head.cfg b/.kokoro/samples/python3.13/periodic-head.cfg
new file mode 100644
index 00000000..23a95be9
--- /dev/null
+++ b/.kokoro/samples/python3.13/periodic-head.cfg
@@ -0,0 +1,11 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+env_vars: {
+    key: "INSTALL_LIBRARY_FROM_SOURCE"
+    value: "True"
+}
+
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/google-cloudevents-python/.kokoro/test-samples-against-head.sh"
+}
diff --git a/.kokoro/samples/python3.13/periodic.cfg b/.kokoro/samples/python3.13/periodic.cfg
new file mode 100644
index 00000000..71cd1e59
--- /dev/null
+++ b/.kokoro/samples/python3.13/periodic.cfg
@@ -0,0 +1,6 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+env_vars: {
+    key: "INSTALL_LIBRARY_FROM_SOURCE"
+    value: "False"
+}
diff --git a/.kokoro/samples/python3.13/presubmit.cfg b/.kokoro/samples/python3.13/presubmit.cfg
new file mode 100644
index 00000000..a1c8d975
--- /dev/null
+++ b/.kokoro/samples/python3.13/presubmit.cfg
@@ -0,0 +1,6 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+env_vars: {
+    key: "INSTALL_LIBRARY_FROM_SOURCE"
+    value: "True"
+}
\ No newline at end of file
diff --git a/.kokoro/test-samples-impl.sh b/.kokoro/test-samples-impl.sh
index 55910c8b..53e365bc 100755
--- a/.kokoro/test-samples-impl.sh
+++ b/.kokoro/test-samples-impl.sh
@@ -33,7 +33,8 @@ export PYTHONUNBUFFERED=1
 env | grep KOKORO
 
 # Install nox
-python3.9 -m pip install --upgrade --quiet nox
+# `virtualenv==20.26.6` is added for Python 3.7 compatibility
+python3.9 -m pip install --upgrade --quiet nox virtualenv==20.26.6
 
 # Use secrets acessor service account to get secrets
 if [[ -f "${KOKORO_GFILE_DIR}/secrets_viewer_service_account.json" ]]; then
diff --git a/CHANGELOG.md b/CHANGELOG.md
index b3b8af6f..f6e9091e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -31,6 +31,13 @@
 * Remove outdated files ([#145](https://github.com/googleapis/google-cloudevents-python/issues/145)) ([888ccc5](https://github.com/googleapis/google-cloudevents-python/commit/888ccc54b46225ee27c3485e09eda0922535a195))
 * **workflows:** Generator not executable, needs an interpreter. ([#150](https://github.com/googleapis/google-cloudevents-python/issues/150)) ([9c8db0e](https://github.com/googleapis/google-cloudevents-python/commit/9c8db0ea7f343e91ec51d9aaad6d90cad09cb4dd))
 
+## [0.14.0](https://github.com/googleapis/google-cloudevents-python/compare/v0.13.0...v0.14.0) (2024-12-05)
+
+
+### Features
+
+* Add delivery_attempt integer field to PubsubMessage ([#306](https://github.com/googleapis/google-cloudevents-python/issues/306)) ([1b96a3a](https://github.com/googleapis/google-cloudevents-python/commit/1b96a3a22ef60e62ca83b4d435add60dc1ed523a))
+
 ## [0.13.0](https://github.com/googleapis/google-cloudevents-python/compare/v0.12.0...v0.13.0) (2024-09-26)
 
 
diff --git a/scripts/requirements.txt b/scripts/requirements.txt
index 6912d43f..7ad30fb5 100644
--- a/scripts/requirements.txt
+++ b/scripts/requirements.txt
@@ -1,4 +1,4 @@
-gapic_generator==1.18.5
-grpcio-tools==1.66.1
-pypandoc_binary==1.13
+gapic_generator==1.20.2
+grpcio-tools==1.68.1
+pypandoc_binary==1.14
 requests==2.32.3
\ No newline at end of file
diff --git a/setup.cfg b/setup.cfg
index 44e7d346..97098d6f 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = google-events
-version = 0.13.0
+version = 0.14.0
 author = Google LLC
 author_email = googleapis-packages@google.com
 description = Google Cloudevents library
diff --git a/src/google/events/cloud/pubsub_v1/types/data.py b/src/google/events/cloud/pubsub_v1/types/data.py
index c1b7a8f1..ada1995e 100644
--- a/src/google/events/cloud/pubsub_v1/types/data.py
+++ b/src/google/events/cloud/pubsub_v1/types/data.py
@@ -41,6 +41,19 @@ class MessagePublishedData(proto.Message):
             The resource name of the subscription for which this event
             was generated. The format of the value is
             ``projects/{project-id}/subscriptions/{subscription-id}``.
+        delivery_attempt (int):
+            The approximate number of times that Pub/Sub has attempted
+            to deliver the associated message to a subscriber.
+
+            More precisely, this is 1 + (number of NACKs) + (number of
+            ack_deadline exceeds) for this message.
+
+            Upon the first delivery of a given message,
+            ``delivery_attempt`` will have a value of 1. The value is
+            calculated at best effort and is approximate.
+
+            If a DeadLetterPolicy is not set on the subscription, this
+            will be 0.
     """
 
     message: 'PubsubMessage' = proto.Field(
@@ -52,6 +65,10 @@ class MessagePublishedData(proto.Message):
         proto.STRING,
         number=2,
     )
+    delivery_attempt: int = proto.Field(
+        proto.INT32,
+        number=3,
+    )
 
 
 class PubsubMessage(proto.Message):
diff --git a/tests/requirements.txt b/tests/requirements.txt
index 40543aab..d197ada2 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -1 +1 @@
-pytest==8.3.3
+pytest==8.3.4