diff --git a/docs/.ruby-version b/docs/.ruby-version
index fe16b348d..8ee3ae2ec 100644
--- a/docs/.ruby-version
+++ b/docs/.ruby-version
@@ -1 +1,4 @@
-2.5.4
+2.7.1
+
+# This version number should track the Ruby version used in production: https://pages.github.com/versions/.
+# If it is out of date, please update and send a PR with the change.