diff --git a/__mocks__/@actions/github.js b/__mocks__/@actions/github.js
index bf57e5c..2c44ce7 100644
--- a/__mocks__/@actions/github.js
+++ b/__mocks__/@actions/github.js
@@ -2,7 +2,7 @@ module.exports = {
   context: {
     repo: { owner: 'test-owner', repo: 'test-repo' },
     runId: 12345,
-    workflow: 'ci.yml'
+    serverUrl: 'https://github.com'
   },
   getOctokit: jest.fn()
 }
diff --git a/__tests__/main.test.ts b/__tests__/main.test.ts
index 8d443b1..38bc814 100644
--- a/__tests__/main.test.ts
+++ b/__tests__/main.test.ts
@@ -77,7 +77,12 @@ describe('SBOM Action', () => {
     }
     getInputMock.mockImplementation(mockInput(inputs))
     const originalEnv = process.env
-    process.env = { ...originalEnv, RUNNER_TEMP: '/tmp' }
+    process.env = {
+      ...originalEnv,
+      RUNNER_TEMP: '/tmp',
+      GITHUB_WORKFLOW_REF:
+        'test-owner/test-repo/.github/workflows/ci.yml@refs/heads/main'
+    }
 
     // Run the main function
     await main.run()
@@ -145,7 +150,12 @@ describe('SBOM Action', () => {
     }
     getInputMock.mockImplementation(mockInput(inputs))
     const originalEnv = process.env
-    process.env = { ...originalEnv, RUNNER_TEMP: '/tmp' }
+    process.env = {
+      ...originalEnv,
+      RUNNER_TEMP: '/tmp',
+      GITHUB_WORKFLOW_REF:
+        'test-owner/test-repo/.github/workflows/ci.yml@refs/heads/main'
+    }
 
     // Mock release not found
     mockGetReleaseByTag.mockRejectedValue({ status: 404 })
diff --git a/__tests__/release.test.ts b/__tests__/release.test.ts
index 37c34a5..737d528 100644
--- a/__tests__/release.test.ts
+++ b/__tests__/release.test.ts
@@ -13,17 +13,33 @@ describe('generateAssetName', () => {
 })
 
 describe('buildAttesterId', () => {
-  it('builds correct attester ID URL', () => {
-    const result = buildAttesterId('octocat', 'hello-world', 'ci.yml')
+  it('builds correct attester ID URL from workflow ref', () => {
+    const result = buildAttesterId(
+      'https://github.com',
+      'octocat/hello-world/.github/workflows/ci.yml@refs/heads/main'
+    )
     expect(result).toBe(
       'https://github.com/octocat/hello-world/.github/workflows/ci.yml'
     )
   })
 
-  it('handles workflow names with spaces', () => {
-    const result = buildAttesterId('owner', 'repo', 'Build and Test.yml')
+  it('handles workflow refs with tags', () => {
+    const result = buildAttesterId(
+      'https://github.com',
+      'owner/repo/.github/workflows/release.yml@refs/tags/v1.0.0'
+    )
     expect(result).toBe(
-      'https://github.com/owner/repo/.github/workflows/Build and Test.yml'
+      'https://github.com/owner/repo/.github/workflows/release.yml'
+    )
+  })
+
+  it('handles enterprise server URLs', () => {
+    const result = buildAttesterId(
+      'https://github.example.com',
+      'owner/repo/.github/workflows/build.yml@refs/heads/main'
+    )
+    expect(result).toBe(
+      'https://github.example.com/owner/repo/.github/workflows/build.yml'
     )
   })
 })
diff --git a/dist/index.js b/dist/index.js
index e79ffb3..5a3da70 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -58393,13 +58393,17 @@ async function run() {
         // Get context for release upload
         const { owner, repo } = github.context.repo;
         const runId = github.context.runId;
-        const workflow = github.context.workflow;
+        const serverUrl = github.context.serverUrl;
+        const workflowRef = process.env.GITHUB_WORKFLOW_REF;
+        if (!workflowRef) {
+            throw new Error('Missing GITHUB_WORKFLOW_REF environment variable');
+        }
         // Upload SBOM to release
         core.debug('Uploading SBOM to release');
         const octokit = github.getOctokit(token);
         const { downloadUrl } = await (0, release_1.uploadSBOMToRelease)(octokit, owner, repo, runId, sbomPath);
         // Generate reference predicate
-        const attesterId = (0, release_1.buildAttesterId)(owner, repo, workflow);
+        const attesterId = (0, release_1.buildAttesterId)(serverUrl, workflowRef);
         const mediaType = (0, reference_1.getMediaType)(sbom.type);
         const predicate = (0, reference_1.generateReferencePredicate)({
             attesterId,
@@ -58542,8 +58546,11 @@ function generateAssetName(runId, sbomPath) {
     const originalName = path_1.default.basename(sbomPath);
     return `${runId}-${originalName}`;
 }
-function buildAttesterId(owner, repo, workflow) {
-    return `https://github.com/${owner}/${repo}/.github/workflows/${workflow}`;
+function buildAttesterId(serverUrl, workflowRef) {
+    // workflowRef is in the format: owner/repo/.github/workflows/file.yml@refs/heads/branch
+    // Extract just the owner/repo/.github/workflows/file.yml part
+    const workflowPath = workflowRef.split('@')[0];
+    return `${serverUrl}/${workflowPath}`;
 }
 
 
diff --git a/src/main.ts b/src/main.ts
index e272e78..ae0917d 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -27,7 +27,12 @@ export async function run(): Promise<void> {
     // Get context for release upload
     const { owner, repo } = github.context.repo
     const runId = github.context.runId
-    const workflow = github.context.workflow
+    const serverUrl = github.context.serverUrl
+    const workflowRef = process.env.GITHUB_WORKFLOW_REF
+
+    if (!workflowRef) {
+      throw new Error('Missing GITHUB_WORKFLOW_REF environment variable')
+    }
 
     // Upload SBOM to release
     core.debug('Uploading SBOM to release')
@@ -41,7 +46,7 @@ export async function run(): Promise<void> {
     )
 
     // Generate reference predicate
-    const attesterId = buildAttesterId(owner, repo, workflow)
+    const attesterId = buildAttesterId(serverUrl, workflowRef)
     const mediaType = getMediaType(sbom.type)
     const predicate = generateReferencePredicate({
       attesterId,
diff --git a/src/release.ts b/src/release.ts
index dee5358..7babc78 100644
--- a/src/release.ts
+++ b/src/release.ts
@@ -81,9 +81,11 @@ export function generateAssetName(runId: number, sbomPath: string): string {
 }
 
 export function buildAttesterId(
-  owner: string,
-  repo: string,
-  workflow: string
+  serverUrl: string,
+  workflowRef: string
 ): string {
-  return `https://github.com/${owner}/${repo}/.github/workflows/${workflow}`
+  // workflowRef is in the format: owner/repo/.github/workflows/file.yml@refs/heads/branch
+  // Extract just the owner/repo/.github/workflows/file.yml part
+  const workflowPath = workflowRef.split('@')[0]
+  return `${serverUrl}/${workflowPath}`
 }