diff --git a/.changeset/happy-pets-breathe.md b/.changeset/happy-pets-breathe.md
new file mode 100644
index 0000000000..414ae86dad
--- /dev/null
+++ b/.changeset/happy-pets-breathe.md
@@ -0,0 +1,5 @@
+---
+"@khanacademy/perseus": minor
+---
+
+Avoid adding undefined values to objects parsed from Perseus JSON when properties are missing.