diff --git a/.changeset/selfish-peas-begin.md b/.changeset/selfish-peas-begin.md
new file mode 100644
index 000000000..cb32ffcae
--- /dev/null
+++ b/.changeset/selfish-peas-begin.md
@@ -0,0 +1,8 @@
+---
+"graphile-build-pg": patch
+"postgraphile": patch
+"@dataplan/pg": patch
+---
+
+Overhaul how PostgreSQL arrays are handled, and fix the "empty arrays become
+null" bug caused by using `array_agg()`.