diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 50d0c15..8c8a44e 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -10,7 +10,7 @@ default:
   - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
 
 build frontend:
-  image: node:22-alpine
+  image: node:24-alpine
   stage: build frontend
   before_script: []
   variables:
diff --git a/Dockerfile b/Dockerfile
index 2c6bad4..ae35fbb 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,9 +1,9 @@
-FROM node:22 AS frontend-builder
+FROM node:24 AS frontend-builder
 
 COPY ./maubot/management/frontend /frontend
 RUN cd /frontend && yarn --prod && yarn build
 
-FROM alpine:3.21
+FROM alpine:3.22
 
 RUN apk add --no-cache \
         python3 py3-pip py3-setuptools py3-wheel \
diff --git a/Dockerfile.ci b/Dockerfile.ci
index 9712a16..fb76f50 100644
--- a/Dockerfile.ci
+++ b/Dockerfile.ci
@@ -1,4 +1,4 @@
-FROM alpine:3.21
+FROM alpine:3.22
 
 RUN apk add --no-cache \
         python3 py3-pip py3-setuptools py3-wheel \
diff --git a/maubot/matrix.py b/maubot/matrix.py
index 7f1ec0f..3763533 100644
--- a/maubot/matrix.py
+++ b/maubot/matrix.py
@@ -15,7 +15,7 @@
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 from __future__ import annotations
 
-from typing import Awaitable
+from typing import Any, Awaitable
 from html import escape
 import asyncio
 
@@ -88,6 +88,7 @@ class MaubotMessageEvent(MessageEvent):
         reply: bool | str = False,
         in_thread: bool | None = None,
         edits: EventID | MessageEvent | None = None,
+        extra_content: dict[str, Any] | None = None,
     ) -> EventID:
         """
         Respond to the message.
@@ -107,6 +108,7 @@ class MaubotMessageEvent(MessageEvent):
                 the root if necessary.
             edits: An event ID or MessageEvent to edit. If set, the reply and in_thread parameters
                 are ignored, as edits can't change the reply or thread status.
+            extra_content: Extra content to add to the event.
 
         Returns:
             The ID of the response event.
@@ -143,6 +145,9 @@ class MaubotMessageEvent(MessageEvent):
                 )
             else:
                 content.set_reply(self)
+        if extra_content:
+            for k, v in extra_content.items():
+                content[k] = v
         return await self.client.send_message_event(self.room_id, event_type, content)
 
     def reply(
@@ -152,6 +157,7 @@ class MaubotMessageEvent(MessageEvent):
         markdown: bool = True,
         allow_html: bool = False,
         in_thread: bool | None = None,
+        extra_content: dict[str, Any] | None = None,
     ) -> Awaitable[EventID]:
         """
         Reply to the message. The parameters are the same as :meth:`respond`,
@@ -169,6 +175,7 @@ class MaubotMessageEvent(MessageEvent):
                 thread. If set to ``False``, the response will never be in a thread. If set to
                 ``True``, the response will always be in a thread, creating one with this event as
                 the root if necessary.
+            extra_content: Extra content to add to the event.
 
         Returns:
             The ID of the response event.
@@ -180,6 +187,7 @@ class MaubotMessageEvent(MessageEvent):
             reply=True,
             in_thread=in_thread,
             allow_html=allow_html,
+            extra_content=extra_content,
         )
 
     def mark_read(self) -> Awaitable[None]: