diff --git a/.github/main.workflow b/.github/main.workflow
index e62af80adf..a2e3c22b0b 100644
--- a/.github/main.workflow
+++ b/.github/main.workflow
@@ -1,6 +1,6 @@
 workflow "GraphQL schema update" {
-  // Every Tuesday at 1am.
-  on = "schedule(0 1 * * 2)"
+  // Every Wednesday at 1am.
+  on = "schedule(0 1 * * 3)"
   resolves = "Update schema"
 }
 
diff --git a/actions/schema-up/index.js b/actions/schema-up/index.js
index 2e602601cb..2908d39637 100644
--- a/actions/schema-up/index.js
+++ b/actions/schema-up/index.js
@@ -42,7 +42,7 @@ Toolkit.run(async tools => {
 
   if (hasRelayChanges === 0 && !relayFailed) {
     tools.log.info('Generated relay files are unchanged.');
-    const upstream = tools.context.ref || 'master';
+    const upstream = tools.context.ref || 'HEAD:refs/heads/master';
     await tools.runInWorkspace('git', ['push', 'origin', upstream]);
     tools.exit.success('Schema is up to date on master.');
   }