diff --git a/CHANGELOG.md b/CHANGELOG.md
index 065b12e..671f035 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,17 @@ All notable changes to this project are documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.3.1]
+
+### Fixed
+- In group chats the bot no longer replies "I don't know how to read files or
+  videos" to videos and documents it wasn't mentioned in — `unsupport_message_handle`
+  now respects the same `is_bot_mentioned` check as the other handlers (#454).
+
+### Security
+- Bumped `python-dotenv` 1.0.1 → 1.2.2 to resolve a symlink-following advisory in
+  `set_key` (Dependabot).
+
 ## [1.3.0]
 
 ### Removed
diff --git a/VERSION b/VERSION
index f0bb29e..3a3cd8c 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.3.0
+1.3.1
diff --git a/bot/bot.py b/bot/bot.py
index 04ac0e5..b1dce2d 100644
--- a/bot/bot.py
+++ b/bot/bot.py
@@ -329,6 +329,10 @@ async def _vision_message_handle_fn(
         return
 
 async def unsupport_message_handle(update: Update, context: CallbackContext, message=None):
+    # check if bot was mentioned (for group chats)
+    if not await is_bot_mentioned(update, context):
+        return
+
     error_text = f"I don't know how to read files or videos. Send the picture in normal mode (Quick Mode)."
     logger.error(error_text)
     await update.message.reply_text(error_text)
diff --git a/requirements.txt b/requirements.txt
index 85c522e..fbfc44b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,4 +3,4 @@ openai>=1.40.0,<2.0.0
 tiktoken>=0.7.0
 PyYAML==6.0.2
 pymongo==4.6.3
-python-dotenv==1.0.1
+python-dotenv==1.2.2