diff --git a/src/ghcr-client.ts b/src/ghcr-client.ts
index 0280a8e..d200424 100644
--- a/src/ghcr-client.ts
+++ b/src/ghcr-client.ts
@@ -202,7 +202,7 @@ async function uploadManifest(
     )
   }
 
-  const digestResponseHeader = putResponse.headers['Docker-Content-Digest']
+  const digestResponseHeader = putResponse.headers['docker-content-digest']
   if (digestResponseHeader === undefined) {
     throw new Error(
       `No digest header in response from PUT manifest ${manifestEndpoint}`
diff --git a/src/main.ts b/src/main.ts
index 82cc783..42a8130 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -78,7 +78,7 @@ export async function run(pathInput: string): Promise<void> {
 
     core.setOutput('package-url', packageURL.toString())
     core.setOutput('package-manifest', JSON.stringify(manifest))
-    core.setOutput('package-manifest-sha', `sha256:${manifestDigest}`)
+    core.setOutput('package-manifest-sha', manifestDigest)
   } catch (error) {
     // Fail the workflow run if an error occurs
     if (error instanceof Error) core.setFailed(error.message)