diff --git a/packages/attest/src/artifactMetadata.ts b/packages/attest/src/artifactMetadata.ts
index 57c94611..c797dde1 100644
--- a/packages/attest/src/artifactMetadata.ts
+++ b/packages/attest/src/artifactMetadata.ts
@@ -55,7 +55,7 @@ export async function createStorageRecord(
   const octokit = github.getOctokit(token, {retry: {retries}}, retry)
 
   const headersWithUserAgent = {
-    'user-agent': getUserAgent(),
+    'User-Agent': getUserAgent(),
     ...headers
   }