diff --git a/mcp-server/src/legal_mcp/services/db.py b/mcp-server/src/legal_mcp/services/db.py
index 8e8ad1c..f4207b3 100644
--- a/mcp-server/src/legal_mcp/services/db.py
+++ b/mcp-server/src/legal_mcp/services/db.py
@@ -2096,7 +2096,17 @@ async def update_halacha(
     if not set_parts:
         return None
     set_parts.append("updated_at = now()")
-    sql = f"UPDATE halachot SET {', '.join(set_parts)} WHERE id = $1 RETURNING *"
+    # Exclude `embedding` — it's a numpy.ndarray of np.float32 that breaks
+    # FastAPI's jsonable_encoder downstream (PATCH /api/halachot/{id}).
+    # Callers that need it (none today) can re-fetch with get_halacha.
+    sql = f"""
+        UPDATE halachot SET {', '.join(set_parts)} WHERE id = $1
+        RETURNING id, case_law_id, halacha_index, rule_statement, rule_type,
+                  reasoning_summary, supporting_quote, page_reference,
+                  practice_areas, subject_tags, cites, confidence,
+                  quote_verified, review_status, reviewer, reviewed_at,
+                  created_at, updated_at
+    """
     row = await pool.fetchrow(sql, *params)
     return dict(row) if row else None