A new Cloud Composer release has started on September 30, 2025

## Announcement A new Cloud Composer release has started on **September 30, 2025**. Get ready for upcoming changes and features as we roll out the new release to all regions. This release is in progress at the moment. Listed changes and features might not be available in some regions yet. ## Fix The `GCE_METADATA_TIMEOUT` environment variable is changed to reserved. This change addresses an issue where setting a low timeout value disrupted the environment's operations that relied on the metadata server. ## Fix DAG UI now correctly generates error messages about malformed serialized DAG. ## Change _(Airflow 2.10.5)_ The `apache-airflow-providers-google` package was upgraded to version 17.2.0 in Cloud Composer 2 images and Cloud Composer 3 builds. For more information about changes, see the[apache-airflow-providers-google changelog](https://airflow.apache.org/docs/apache-airflow-providers-google/stable/changelog.html) from version 17.1.0 to version 17.2.0. ## Issue _(Airflow 2.10.5)_ CloudComposerDAGRunSensor is broken in the`apache-airflow-providers-google` package version 17.2.0\. This package is used by Cloud Composer versions and builds with Airflow 2.10.5 available in this release. If your DAGs use this sensor, we recommend you postpone upgrading until the issue is resolved. ## Change _(Airflow 2.10.5)_ The `apache-airflow-providers-cncf-kubernetes` package was[upgraded to version 10.8.0](https://airflow.apache.org/docs/apache-airflow-providers-cncf-kubernetes/stable/changelog.html)from version 10.7.0\. For changes in other packages, see the[preinstalled packages changelog](https://cloud.google.com/composer/docs/versions-packages). ## Change New [Airflow builds](https://cloud.google.com/composer/docs/composer-versions#images-composer-3)are available in Cloud Composer 3: * [composer-3-airflow-2.10.5-build.15](https://cloud.google.com/composer/docs/versions-packages#composer-3-airflow-2-10-5-build-15) (default) * [composer-3-airflow-2.9.3-build.35](https://cloud.google.com/composer/docs/versions-packages#composer-3-airflow-2-9-3-build-35) ## Change New [images](https://cloud.google.com/composer/docs/composer-versions#images-composer-2)are available in Cloud Composer 2: * [composer-2.14.4-airflow-2.10.5](https://cloud.google.com/composer/docs/versions-packages#composer-2-14-4-airflow-2-10-5) (default) * [composer-2.14.4-airflow-2.9.3](https://cloud.google.com/composer/docs/versions-packages#composer-2-14-4-airflow-2-9-3) ## Deprecate The following Cloud Composer versions and builds have reached their[end of support period](https://cloud.google.com/composer/docs/composer-versioning-overview#version-deprecation-and-support): composer-2.9.4-\*, and composer-3-airflow-2.9.1 builds from build.0 to build.7.