diff --git a/packages/attest/__tests__/__snapshots__/provenance.test.ts.snap b/packages/attest/__tests__/__snapshots__/provenance.test.ts.snap
index f4b22123..409d9f91 100644
--- a/packages/attest/__tests__/__snapshots__/provenance.test.ts.snap
+++ b/packages/attest/__tests__/__snapshots__/provenance.test.ts.snap
@@ -1,6 +1,48 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`provenance functions buildSLSAProvenancePredicate returns a provenance hydrated from an OIDC token 1`] = `
+exports[`provenance functions buildSLSAProvenancePredicate returns a provenance from an org required workflow: provenance from org required workflow 1`] = `
+{
+  "params": {
+    "buildDefinition": {
+      "buildType": "https://actions.github.io/buildtypes/workflow/v1",
+      "externalParameters": {
+        "workflow": {
+          "path": ".github/workflows/enforce.yml",
+          "ref": "refs/heads/vetted",
+          "repository": "https://foo.ghe.com/enterprise/org-workflows",
+        },
+      },
+      "internalParameters": {
+        "github": {
+          "event_name": "push",
+          "repository_id": "repo-id",
+          "repository_owner_id": "owner-id",
+          "runner_environment": "github-hosted",
+        },
+      },
+      "resolvedDependencies": [
+        {
+          "digest": {
+            "gitCommit": "babca52ab0c93ae16539e5923cb0d7403b9a093b",
+          },
+          "uri": "git+https://foo.ghe.com/owner/repo@refs/heads/main",
+        },
+      ],
+    },
+    "runDetails": {
+      "builder": {
+        "id": "https://foo.ghe.com/enterprise/org-workflows/.github/workflows/enforce.yml@refs/heads/vetted",
+      },
+      "metadata": {
+        "invocationId": "https://foo.ghe.com/owner/repo/actions/runs/run-id/attempts/run-attempt",
+      },
+    },
+  },
+  "type": "https://slsa.dev/provenance/v1",
+}
+`;
+
+exports[`provenance functions buildSLSAProvenancePredicate returns a provenance hydrated from an OIDC token: provenance with OIDC token 1`] = `
 {
   "params": {
     "buildDefinition": {
@@ -31,7 +73,7 @@ exports[`provenance functions buildSLSAProvenancePredicate returns a provenance
     },
     "runDetails": {
       "builder": {
-        "id": "https://foo.ghe.com/owner/workflows/.github/workflows/publish.yml@main",
+        "id": "https://foo.ghe.com/owner/workflows/.github/workflows/publish.yml@refs/heads/main",
       },
       "metadata": {
         "invocationId": "https://foo.ghe.com/owner/repo/actions/runs/run-id/attempts/run-attempt",
diff --git a/packages/attest/__tests__/provenance.test.ts b/packages/attest/__tests__/provenance.test.ts
index 2b533053..ca2f4f4d 100644
--- a/packages/attest/__tests__/provenance.test.ts
+++ b/packages/attest/__tests__/provenance.test.ts
@@ -23,8 +23,27 @@ describe('provenance functions', () => {
     repository: 'owner/repo',
     ref: 'refs/heads/main',
     sha: 'babca52ab0c93ae16539e5923cb0d7403b9a093b',
-    job_workflow_ref: 'owner/workflows/.github/workflows/publish.yml@main',
-    workflow_ref: 'owner/repo/.github/workflows/main.yml@main',
+    job_workflow_ref:
+      'owner/workflows/.github/workflows/publish.yml@refs/heads/main',
+    workflow_ref: 'owner/repo/.github/workflows/main.yml@refs/heads/main',
+    event_name: 'push',
+    repository_id: 'repo-id',
+    repository_owner_id: 'owner-id',
+    run_id: 'run-id',
+    run_attempt: 'run-attempt',
+    runner_environment: 'github-hosted'
+  }
+
+  const orgEnforcedclaims = {
+    iss: issuer,
+    aud: 'nobody',
+    repository: 'owner/repo',
+    ref: 'refs/heads/main',
+    sha: 'babca52ab0c93ae16539e5923cb0d7403b9a093b',
+    job_workflow_ref:
+      'enterprise/org-workflows/.github/workflows/enforce.yml@refs/heads/vetted',
+    workflow_ref:
+      'enterprise/org-workflows/.github/workflows/enforce.yml@refs/heads/vetted',
     event_name: 'push',
     repository_id: 'repo-id',
     repository_owner_id: 'owner-id',
@@ -73,7 +92,14 @@ describe('provenance functions', () => {
   describe('buildSLSAProvenancePredicate', () => {
     it('returns a provenance hydrated from an OIDC token', async () => {
       const predicate = await buildSLSAProvenancePredicate()
-      expect(predicate).toMatchSnapshot()
+      expect(predicate).toMatchSnapshot('provenance with OIDC token')
+    })
+
+    it('returns a provenance from an org required workflow', async () => {
+      nock.cleanAll()
+      await mockIssuer(orgEnforcedclaims)
+      const predicate = await buildSLSAProvenancePredicate()
+      expect(predicate).toMatchSnapshot('provenance from org required workflow')
     })
   })
 
diff --git a/packages/attest/src/provenance.ts b/packages/attest/src/provenance.ts
index 1bd1e5c9..267b5d0e 100644
--- a/packages/attest/src/provenance.ts
+++ b/packages/attest/src/provenance.ts
@@ -27,12 +27,15 @@ export const buildSLSAProvenancePredicate = async (
   const serverURL = process.env.GITHUB_SERVER_URL
   const claims = await getIDTokenClaims(issuer)
 
-  // Split just the path and ref from the workflow string.
-  // owner/repo/.github/workflows/main.yml@main =>
-  //   .github/workflows/main.yml, main
-  const [workflowPath] = claims.workflow_ref
-    .replace(`${claims.repository}/`, '')
-    .split('@')
+  // Split up the repo, path and ref from the workflow string.
+  // owner/repo/.github/workflows/main.yml@refs/heads/main =>
+  //   owner/repo, .github/workflows/main.yml, main
+  const workflowRef = claims.workflow_ref
+  const pathStart = workflowRef.indexOf('/.github/')
+  const refStart = workflowRef.lastIndexOf('@')
+  const workflowRepo = workflowRef.substring(0, pathStart)
+  const workflowPath = workflowRef.substring(pathStart + 1, refStart)
+  const workflowGitRef = workflowRef.substring(refStart + 1)
 
   return {
     type: SLSA_PREDICATE_V1_TYPE,
@@ -41,8 +44,8 @@ export const buildSLSAProvenancePredicate = async (
         buildType: GITHUB_BUILD_TYPE,
         externalParameters: {
           workflow: {
-            ref: claims.ref,
-            repository: `${serverURL}/${claims.repository}`,
+            ref: workflowGitRef,
+            repository: `${serverURL}/${workflowRepo}`,
             path: workflowPath
           }
         },