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**To update a web ACL**

The following ``update-web-acl`` changes settings for an existing web ACL. This call requires an ID, which you can obtain from the call, ``list-web-acls``, and a lock token and other settings, which you can obtain from the call ``get-web-acl``. This call also returns a lock token that you can use for a subsequent update. ::

    aws wafv2 update-web-acl \
        --name TestWebAcl \
        --scope REGIONAL \
        --id a1b2c3d4-5678-90ab-cdef-EXAMPLE11111 \
        --lock-token 2294b3a1-0000-0000-0000-a3ae04329de9 \
        --default-action Block={} \
        --visibility-config SampledRequestsEnabled=false,CloudWatchMetricsEnabled=false,MetricName=NewMetricTestWebAcl \
        --rules file://waf-rule.json \
        --region us-west-2

Output::

    {
        "NextLockToken": "714a0cfb-0000-0000-0000-2959c8b9a684"
    }

For more information, see `Managing and Using a Web Access Control List (Web ACL) <https://docs.aws.amazon.com/waf/latest/developerguide/web-acl.html>`__ in the *AWS WAF, AWS Firewall Manager, and AWS Shield Advanced Developer Guide*.