diff --git a/README.rst b/README.rst
index 76743bf0250..d9a61b5c95c 100644
--- a/README.rst
+++ b/README.rst
@@ -1,6 +1,3 @@
-..
-    Make sure to apply any changes to this file to README_RAW.rst as well!
-
 .. image:: https://raw.githubusercontent.com/python-telegram-bot/logos/master/logo-text/png/ptb-logo-text_768.png
    :align: center
    :target: https://python-telegram-bot.org
@@ -79,13 +76,6 @@ In addition to the pure API implementation, this library features a number of hi
 make the development of bots easy and straightforward. These classes are contained in the
 ``telegram.ext`` submodule.
 
-A pure API implementation *without* ``telegram.ext`` is available as the standalone package ``python-telegram-bot-raw``.  `See here for details. <https://github.com/python-telegram-bot/python-telegram-bot/blob/master/README_RAW.rst>`_
-
-Note
-----
-
-Installing both ``python-telegram-bot`` and ``python-telegram-bot-raw`` in conjunction will result in undesired side-effects, so only install *one* of both.
-
 Telegram API support
 ====================
 
diff --git a/README_RAW.rst b/README_RAW.rst
index 45f636bc2f7..64f83121e21 100644
--- a/README_RAW.rst
+++ b/README_RAW.rst
@@ -1,6 +1,3 @@
-..
-    Make sure to apply any changes to this file to README.rst as well!
-
 .. image:: https://github.com/python-telegram-bot/logos/blob/master/logo-text/png/ptb-raw-logo-text_768.png?raw=true
    :align: center
    :target: https://python-telegram-bot.org
@@ -62,6 +59,16 @@
    :target: https://telegram.me/pythontelegrambotgroup
    :alt: Telegram Group
 
+⚠️ Deprecation Notice
+=====================
+
+The ``python-telegram-bot-raw`` library will no longer be updated after NEXT.VERSION.
+Please instead use the ``python-telegram-bot`` `library <https://pypi.org/python-telegram-bot>`_.
+The change requires no changes in your code and requires no additional dependencies.
+For additional information, please see this `channel post <https://t.me/pythontelegrambotchannel/145>`_.
+
+----
+
 We have made you a wrapper you can't refuse
 
 We have a vibrant community of developers helping each other in our `Telegram group <https://telegram.me/pythontelegrambotgroup>`_. Join us!
diff --git a/telegram/__init__.py b/telegram/__init__.py
index 5e0f3eaac3b..1230716e785 100644
--- a/telegram/__init__.py
+++ b/telegram/__init__.py
@@ -242,6 +242,7 @@
     "warnings",
 )
 
+from pathlib import Path
 
 from . import _version, constants, error, helpers, request, warnings
 from ._birthdate import Birthdate
@@ -442,6 +443,7 @@
 from ._update import Update
 from ._user import User
 from ._userprofilephotos import UserProfilePhotos
+from ._utils.warnings import warn
 from ._videochat import (
     VideoChatEnded,
     VideoChatParticipantsInvited,
@@ -475,3 +477,28 @@
 #:
 #: .. versionadded:: 20.0
 __bot_api_version_info__: constants._BotAPIVersion = _version.__bot_api_version_info__
+
+
+if not (Path(__file__).parent.resolve().absolute() / "ext").exists():
+    _MESSAGE = (
+        "Hey. You seem to be using the `python-telegram-bot-raw` library. "
+        "Please note that this libray has been deprecated and will no longer be updated. "
+        "Please instead use the `python-telegram-bot` library. The change requires no "
+        "changes in your code and requires no additional dependencies. For additional "
+        "information, please see the channel post at "
+        "https://t.me/pythontelegrambotchannel/145."
+    )
+
+    # DeprecationWarning is ignored by default in Python 3.7 and later by default outside
+    # __main__ modules. We use both warning categories to increase the chance of the user
+    # seeing the warning.
+
+    warn(
+        warnings.PTBDeprecationWarning(version="NEXT.VERSION", message=_MESSAGE),
+        stacklevel=2,
+    )
+    warn(
+        message=_MESSAGE,
+        category=warnings.PTBUserWarning,
+        stacklevel=2,
+    )
diff --git a/telegram/_utils/datetime.py b/telegram/_utils/datetime.py
index 9790e27857d..1c0da085434 100644
--- a/telegram/_utils/datetime.py
+++ b/telegram/_utils/datetime.py
@@ -194,7 +194,7 @@ def extract_tzinfo_from_defaults(bot: "Bot") -> Union[dtm.tzinfo, None]:
     If the bot has no default values, :obj:`None` is returned.
     """
     # We don't use `ininstance(bot, ExtBot)` here so that this works
-    # in `python-telegram-bot-raw` as well
+    # without the job-queue extra dependencies as well
     if hasattr(bot, "defaults") and bot.defaults:
         return bot.defaults.tzinfo
     return None