diff --git a/api/src/message.rs b/api/src/message.rs
index 4084518c..0d5c8849 100644
--- a/api/src/message.rs
+++ b/api/src/message.rs
@@ -11,6 +11,8 @@ pub struct CreateBundleUploadRequest {
     pub client_version: String,
     #[serde(rename = "remoteUrls")]
     pub remote_urls: Vec<String>,
+    #[serde(rename = "externalId")]
+    pub external_id: Option<String>,
 }
 
 #[derive(Debug, Serialize, Clone, Deserialize)]
diff --git a/cli-tests/src/upload.rs b/cli-tests/src/upload.rs
index f0964fb3..e7aa417b 100644
--- a/cli-tests/src/upload.rs
+++ b/cli-tests/src/upload.rs
@@ -51,6 +51,7 @@ async fn upload_bundle() {
 
     let assert = command_builder
         .command()
+        .env("GITHUB_EXTERNAL_ID", "test-external-id-123")
         .assert()
         // should fail due to quarantine and succeed without quarantining
         .failure();
@@ -94,6 +95,7 @@ async fn upload_bundle() {
         .starts_with("trunk-analytics-cli cargo="));
     assert!(upload_request.client_version.contains(" git="));
     assert!(upload_request.client_version.contains(" rustc="));
+    assert!(upload_request.external_id.is_some());
 
     let tar_extract_directory =
         assert_matches!(requests_iter.next().unwrap(), RequestPayload::S3Upload(d) => d);
diff --git a/cli/src/context.rs b/cli/src/context.rs
index d46b4d4f..4aebbeb6 100644
--- a/cli/src/context.rs
+++ b/cli/src/context.rs
@@ -706,12 +706,14 @@ pub async fn gather_upload_id_context(
     if dry_run {
         return Err(anyhow::anyhow!("Dry run mode enabled, unable to upload"));
     }
+    let external_id = meta.base_props.envs.get("GITHUB_EXTERNAL_ID").cloned();
     let upload = api_client
         .create_bundle_upload(&api::message::CreateBundleUploadRequest {
             repo: meta.base_props.repo.repo.clone(),
             org_url_slug: meta.base_props.org.clone(),
             client_version: format!("trunk-analytics-cli {}", meta.base_props.cli_version),
             remote_urls: vec![meta.base_props.repo.repo_url.clone()],
+            external_id,
         })
         .await?;
     meta.base_props.bundle_upload_id.clone_from(&upload.id);