diff --git a/mautrix_telegram/db/upgrade/v00_latest_revision.py b/mautrix_telegram/db/upgrade/v00_latest_revision.py
index ae4acd5a..de862bcf 100644
--- a/mautrix_telegram/db/upgrade/v00_latest_revision.py
+++ b/mautrix_telegram/db/upgrade/v00_latest_revision.py
@@ -15,7 +15,7 @@
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 from mautrix.util.async_db import Connection, Scheme
 
-latest_version = 13
+latest_version = 14
 
 
 async def create_latest_tables(conn: Connection, scheme: Scheme) -> int:
@@ -123,6 +123,7 @@ async def create_latest_tables(conn: Connection, scheme: Scheme) -> int:
         )"""
     )
     await conn.execute("CREATE INDEX puppet_username_idx ON puppet(LOWER(username))")
+    await conn.execute("CREATE INDEX puppet_custom_mxid_idx ON puppet(custom_mxid)")
     await conn.execute(
         """CREATE TABLE telegram_file (
             id              TEXT PRIMARY KEY,