diff --git a/action.yml b/action.yml
index 3263808c..8e03bea9 100644
--- a/action.yml
+++ b/action.yml
@@ -57,6 +57,28 @@ inputs:
       at other inputs and environment variables.
     required: false
 
+  workload_identity_provider:
+    description: |-
+      The full identifier of the Workload Identity Provider, including the
+      project number, pool name, and provider name. If provided, this must be
+      the full identifier which includes all parts, for example:
+      "projects/123456789/locations/global/workloadIdentityPools/my-pool/providers/my-provider".
+      This is mutually exclusive with "credentials_json".
+    required: false
+
+  service_account:
+    description: |-
+      Email address or unique identifier of the Google Cloud service account for
+      which to generate credentials. This is required if
+      "workload_identity_provider" is specified.
+    required: false
+
+  credentials_json:
+    description: |-
+      The Google Cloud JSON service account key to use for authentication. This
+      is mutually exclusive with "workload_identity_provider".
+    required: false
+
   install_components:
     description: |-
       List of additional [gcloud