diff --git a/mautrix_telegram/commands/handler.py b/mautrix_telegram/commands/handler.py
index 61e16874..958dc60a 100644
--- a/mautrix_telegram/commands/handler.py
+++ b/mautrix_telegram/commands/handler.py
@@ -23,8 +23,8 @@ from mautrix.bridge.commands import (HelpSection, CommandEvent as BaseCommandEve
                                      CommandHandler as BaseCommandHandler,
                                      CommandProcessor as BaseCommandProcessor,
                                      CommandHandlerFunc, command_handler as base_command_handler)
+from mautrix.util.format_duration import format_duration
 
-from ..util import format_duration
 from .. import user as u, context as c, portal as po
 
 
@@ -77,10 +77,11 @@ class CommandHandler(BaseCommandHandler):
     def __init__(self, handler: Callable[[CommandEvent], Awaitable[EventID]],
                  management_only: bool, name: str, help_text: str, help_args: str,
                  help_section: HelpSection, needs_auth: bool, needs_puppeting: bool,
-                 needs_matrix_puppeting: bool, needs_admin: bool) -> None:
+                 needs_matrix_puppeting: bool, needs_admin: bool, **kwargs) -> None:
         super().__init__(handler, management_only, name, help_text, help_args, help_section,
                          needs_auth=needs_auth, needs_puppeting=needs_puppeting,
-                         needs_matrix_puppeting=needs_matrix_puppeting, needs_admin=needs_admin)
+                         needs_matrix_puppeting=needs_matrix_puppeting, needs_admin=needs_admin,
+                         **kwargs)
 
     async def get_permission_error(self, evt: CommandEvent) -> Optional[str]:
         if self.needs_puppeting and not evt.sender.puppet_whitelisted:
diff --git a/mautrix_telegram/commands/telegram/auth.py b/mautrix_telegram/commands/telegram/auth.py
index cc10c22d..7b8e62d5 100644
--- a/mautrix_telegram/commands/telegram/auth.py
+++ b/mautrix_telegram/commands/telegram/auth.py
@@ -27,11 +27,11 @@ from telethon.tl.types import User
 
 from mautrix.types import (EventID, UserID, MediaMessageEventContent, ImageInfo, MessageType,
                            TextMessageEventContent)
+from mautrix.util.format_duration import format_duration as fmt_duration
 
 from ... import user as u
 from ...types import TelegramID
 from ...commands import command_handler, CommandEvent, SECTION_AUTH
-from ...util import format_duration as fmt_duration
 
 try:
     import qrcode
diff --git a/mautrix_telegram/util/__init__.py b/mautrix_telegram/util/__init__.py
index b2bfa88e..023ef0de 100644
--- a/mautrix_telegram/util/__init__.py
+++ b/mautrix_telegram/util/__init__.py
@@ -1,5 +1,4 @@
 from .file_transfer import transfer_file_to_matrix, convert_image
 from .parallel_file_transfer import parallel_transfer_to_telegram
-from .format_duration import format_duration
 from .recursive_dict import recursive_del, recursive_set, recursive_get
 from .color_log import ColorFormatter
diff --git a/mautrix_telegram/util/format_duration.py b/mautrix_telegram/util/format_duration.py
deleted file mode 100644
index d079cc0d..00000000
--- a/mautrix_telegram/util/format_duration.py
+++ /dev/null
@@ -1,35 +0,0 @@
-# mautrix-telegram - A Matrix-Telegram puppeting bridge
-# Copyright (C) 2019 Tulir Asokan
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-#
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-
-def format_duration(seconds: int) -> str:
-    def pluralize(count: int, singular: str) -> str:
-        return singular if count == 1 else singular + "s"
-
-    def include(count: int, word: str) -> str:
-        return f"{count} {pluralize(count, word)}" if count > 0 else ""
-
-    minutes, seconds = divmod(seconds, 60)
-    hours, minutes = divmod(minutes, 60)
-    days, hours = divmod(hours, 24)
-    parts = [a for a in [
-        include(days, "day"),
-        include(hours, "hour"),
-        include(minutes, "minute"),
-        include(seconds, "second")] if a]
-    if len(parts) > 2:
-        return "{} and {}".format(", ".join(parts[:-1]), parts[-1])
-    return " and ".join(parts)
diff --git a/mautrix_telegram/web/common/auth_api.py b/mautrix_telegram/web/common/auth_api.py
index 8b1a2dc0..c020dd54 100644
--- a/mautrix_telegram/web/common/auth_api.py
+++ b/mautrix_telegram/web/common/auth_api.py
@@ -24,9 +24,9 @@ from aiohttp import web
 from telethon.errors import *
 
 from mautrix.bridge import OnlyLoginSelf, InvalidAccessToken
+from mautrix.util.format_duration import format_duration
 
 from ...commands.telegram.auth import enter_password
-from ...util import format_duration
 from ...puppet import Puppet
 from ...user import User
 
diff --git a/optional-requirements.txt b/optional-requirements.txt
index 1c9b5752..d8fd7fa8 100644
--- a/optional-requirements.txt
+++ b/optional-requirements.txt
@@ -27,4 +27,4 @@ aiosqlite>=0.17,<0.18
 #/e2be
 python-olm>=3,<4
 pycryptodome>=3,<4
-unpaddedbase64>=1,<2
+unpaddedbase64>=1,<3
diff --git a/requirements.txt b/requirements.txt
index be9bfb0e..fc7bd5e2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ python-magic>=0.4,<0.5
 commonmark>=0.8,<0.10
 aiohttp>=3,<4
 yarl>=1,<2
-mautrix>=0.13rc1,<0.14
+mautrix>=0.13.1,<0.14
 telethon>=1.24,<1.25
 telethon-session-sqlalchemy>=0.2.14,<0.3
 # Temporarily always depend on aiosqlite to prevent breaking old installs