diff --git a/README.md b/README.md
index eb0c765..03b9828 100644
--- a/README.md
+++ b/README.md
@@ -86,6 +86,10 @@ See [action.yml](action.yml)
     # the "subject-digest" parameter be specified. Defaults to false.
     push-to-registry:
 
+    # Whether to attach a list of generated attestations to the workflow run
+    # summary page. Defaults to true.
+    show-summary:
+
     # The GitHub token used to make authenticated API requests. Default is
     # ${{ github.token }}
     github-token:
diff --git a/action.yml b/action.yml
index 165fffd..70098d2 100644
--- a/action.yml
+++ b/action.yml
@@ -35,6 +35,12 @@ inputs:
       and that the "subject-digest" parameter be specified. Defaults to false.
     default: false
     required: false
+  show-summary:
+    description: >
+      Whether to attach a list of generated attestations to the workflow run
+      summary page. Defaults to true.
+    default: true
+    required: false
   github-token:
     description: >
       The GitHub token used to make authenticated API requests.
@@ -53,7 +59,7 @@ runs:
       id: generate-sbom-predicate
       with:
         sbom-path: ${{ inputs.sbom-path }}
-    - uses: actions/attest@7305951e905fb742188aa16c1d23409b13565e26 # v1.3.3
+    - uses: actions/attest@2da0b136720d14f01f4dbeeafd1d5a4d76cbe21d # v1.4.0
       id: attest
       with:
         subject-path: ${{ inputs.subject-path }}
@@ -64,4 +70,5 @@ runs:
         predicate-path:
           ${{ steps.generate-sbom-predicate.outputs.predicate-path }}
         push-to-registry: ${{ inputs.push-to-registry }}
+        show-summary: ${{ inputs.show-summary }}
         github-token: ${{ inputs.github-token }}