diff --git a/src/resources/extensions/sf/memory-store.ts b/src/resources/extensions/sf/memory-store.ts
index 2be41d872..db2217217 100644
--- a/src/resources/extensions/sf/memory-store.ts
+++ b/src/resources/extensions/sf/memory-store.ts
@@ -6,6 +6,7 @@
 import {
 	_getAdapter,
 	decayMemoriesBefore,
+	deleteMemoryEmbedding,
 	incrementMemoryHitCount,
 	insertMemoryRow,
 	isDbAvailable,
@@ -270,6 +271,12 @@ export function createMemory(fields: {
 
 /**
  * Update a memory's content and optionally its confidence.
+ *
+ * Invalidates the existing embedding row (if any): the stored vector was
+ * computed against the old content and would otherwise rank incorrectly
+ * on the next cosine query. The next runEmbeddingBackfill sweep will
+ * re-embed the new content. This is best-effort — a missing embedding
+ * row is the silent-fallback case the ranker already handles.
  */
 export function updateMemoryContent(
 	id: string,
@@ -280,6 +287,12 @@ export function updateMemoryContent(
 
 	try {
 		updateMemoryContentRow(id, content, confidence, new Date().toISOString());
+		try {
+			deleteMemoryEmbedding(id);
+		} catch {
+			// Stale-vector window is brief (until next backfill); never fail
+			// the content update because the embedding cleanup raised.
+		}
 		return true;
 	} catch {
 		return false;