diff --git a/.drush-lock-update b/.drush-lock-update
new file mode 100644
index 000000000..6c3bf1730
--- /dev/null
+++ b/.drush-lock-update
@@ -0,0 +1 @@
+Do not update via Drush. See: https://pantheon.io/docs/articles/sites/code/applying-upstream-updates/