diff --git a/bin/generate-fixtures.js b/bin/generate-fixtures.js
index e179cfb31..482276192 100755
--- a/bin/generate-fixtures.js
+++ b/bin/generate-fixtures.js
@@ -50,7 +50,7 @@ for (const repo of repos) {
       variables: {
         owner: repo.owner,
         name: REPO_NAME,
-        ref: repo.branch,
+        targetCommitish: repo.branch,
         withPullRequestBody: true,
         withPullRequestURL: true,
         withBaseRefName: true,