diff --git a/src/websockets/asyncio/connection.py b/src/websockets/asyncio/connection.py
index 4f44d798c..0a3ddb9aa 100644
--- a/src/websockets/asyncio/connection.py
+++ b/src/websockets/asyncio/connection.py
@@ -200,8 +200,8 @@ async def recv(self, decode: bool | None = None) -> Data:
             A string (:class:`str`) for a Text_ frame or a bytestring
             (:class:`bytes`) for a Binary_ frame.
 
-            .. _Text: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
-            .. _Binary: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
+            .. _Text: https://datatracker.ietf.org/doc/html/rfc6455#section-5.6
+            .. _Binary: https://datatracker.ietf.org/doc/html/rfc6455#section-5.6
 
             You may override this behavior with the ``decode`` argument:
 
@@ -253,8 +253,8 @@ async def recv_streaming(self, decode: bool | None = None) -> AsyncIterator[Data
             An iterator of strings (:class:`str`) for a Text_ frame or
             bytestrings (:class:`bytes`) for a Binary_ frame.
 
-            .. _Text: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
-            .. _Binary: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
+            .. _Text: https://datatracker.ietf.org/doc/html/rfc6455#section-5.6
+            .. _Binary: https://datatracker.ietf.org/doc/html/rfc6455#section-5.6
 
             You may override this behavior with the ``decode`` argument:
 
@@ -290,8 +290,8 @@ async def send(self, message: Data | Iterable[Data] | AsyncIterable[Data]) -> No
         bytes-like object (:class:`bytes`, :class:`bytearray`, or
         :class:`memoryview`) is sent as a Binary_ frame.
 
-        .. _Text: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
-        .. _Binary: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
+        .. _Text: https://datatracker.ietf.org/doc/html/rfc6455#section-5.6
+        .. _Binary: https://datatracker.ietf.org/doc/html/rfc6455#section-5.6
 
         :meth:`send` also accepts an iterable or an asynchronous iterable of
         strings, bytestrings, or bytes-like objects to enable fragmentation_.
@@ -299,7 +299,7 @@ async def send(self, message: Data | Iterable[Data] | AsyncIterable[Data]) -> No
         All items must be of the same type, or else :meth:`send` will raise a
         :exc:`TypeError` and the connection will be closed.
 
-        .. _fragmentation: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.4
+        .. _fragmentation: https://datatracker.ietf.org/doc/html/rfc6455#section-5.4
 
         :meth:`send` rejects dict-like objects because this is often an error.
         (If you really want to send the keys of a dict-like object as fragments,
@@ -524,7 +524,7 @@ async def ping(self, data: Data | None = None) -> Awaitable[None]:
         """
         Send a Ping_.
 
-        .. _Ping: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.5.2
+        .. _Ping: https://datatracker.ietf.org/doc/html/rfc6455#section-5.5.2
 
         A ping may serve as a keepalive or as a check that the remote endpoint
         received all messages up to this point
@@ -574,7 +574,7 @@ async def pong(self, data: Data = b"") -> None:
         """
         Send a Pong_.
 
-        .. _Pong: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.5.3
+        .. _Pong: https://datatracker.ietf.org/doc/html/rfc6455#section-5.5.3
 
         An unsolicited pong may serve as a unidirectional heartbeat.
 
diff --git a/src/websockets/extensions/permessage_deflate.py b/src/websockets/extensions/permessage_deflate.py
index 579262f02..fea14131e 100644
--- a/src/websockets/extensions/permessage_deflate.py
+++ b/src/websockets/extensions/permessage_deflate.py
@@ -262,7 +262,7 @@ class ClientPerMessageDeflateFactory(ClientExtensionFactory):
 
     Parameters behave as described in `section 7.1 of RFC 7692`_.
 
-    .. _section 7.1 of RFC 7692: https://www.rfc-editor.org/rfc/rfc7692.html#section-7.1
+    .. _section 7.1 of RFC 7692: https://datatracker.ietf.org/doc/html/rfc7692#section-7.1
 
     Set them to :obj:`True` to include them in the negotiation offer without a
     value or to an integer value to include them with this value.
@@ -462,7 +462,7 @@ class ServerPerMessageDeflateFactory(ServerExtensionFactory):
 
     Parameters behave as described in `section 7.1 of RFC 7692`_.
 
-    .. _section 7.1 of RFC 7692: https://www.rfc-editor.org/rfc/rfc7692.html#section-7.1
+    .. _section 7.1 of RFC 7692: https://datatracker.ietf.org/doc/html/rfc7692#section-7.1
 
     Set them to :obj:`True` to include them in the negotiation offer without a
     value or to an integer value to include them with this value.
diff --git a/src/websockets/headers.py b/src/websockets/headers.py
index bc42e0b72..0ffd65233 100644
--- a/src/websockets/headers.py
+++ b/src/websockets/headers.py
@@ -40,7 +40,7 @@ def build_host(host: str, port: int, secure: bool) -> str:
     Build a ``Host`` header.
 
     """
-    # https://www.rfc-editor.org/rfc/rfc3986.html#section-3.2.2
+    # https://datatracker.ietf.org/doc/html/rfc3986#section-3.2.2
     # IPv6 addresses must be enclosed in brackets.
     try:
         address = ipaddress.ip_address(host)
@@ -59,8 +59,8 @@ def build_host(host: str, port: int, secure: bool) -> str:
 
 
 # To avoid a dependency on a parsing library, we implement manually the ABNF
-# described in https://www.rfc-editor.org/rfc/rfc6455.html#section-9.1 and
-# https://www.rfc-editor.org/rfc/rfc7230.html#appendix-B.
+# described in https://datatracker.ietf.org/doc/html/rfc6455#section-9.1 and
+# https://datatracker.ietf.org/doc/html/rfc7230#appendix-B.
 
 
 def peek_ahead(header: str, pos: int) -> str | None:
@@ -183,7 +183,7 @@ def parse_list(
         InvalidHeaderFormat: On invalid inputs.
 
     """
-    # Per https://www.rfc-editor.org/rfc/rfc7230.html#section-7, "a recipient
+    # Per https://datatracker.ietf.org/doc/html/rfc7230#section-7, "a recipient
     # MUST parse and ignore a reasonable number of empty list elements";
     # hence while loops that remove extra delimiters.
 
@@ -320,7 +320,7 @@ def parse_extension_item_param(
         if peek_ahead(header, pos) == '"':
             pos_before = pos  # for proper error reporting below
             value, pos = parse_quoted_string(header, pos, header_name)
-            # https://www.rfc-editor.org/rfc/rfc6455.html#section-9.1 says:
+            # https://datatracker.ietf.org/doc/html/rfc6455#section-9.1 says:
             # the value after quoted-string unescaping MUST conform to
             # the 'token' ABNF.
             if _token_re.fullmatch(value) is None:
@@ -489,7 +489,7 @@ def build_www_authenticate_basic(realm: str) -> str:
         realm: Identifier of the protection space.
 
     """
-    # https://www.rfc-editor.org/rfc/rfc7617.html#section-2
+    # https://datatracker.ietf.org/doc/html/rfc7617#section-2
     realm = build_quoted_string(realm)
     charset = build_quoted_string("UTF-8")
     return f"Basic realm={realm}, charset={charset}"
@@ -539,8 +539,8 @@ def parse_authorization_basic(header: str) -> tuple[str, str]:
         InvalidHeaderValue: On unsupported inputs.
 
     """
-    # https://www.rfc-editor.org/rfc/rfc7235.html#section-2.1
-    # https://www.rfc-editor.org/rfc/rfc7617.html#section-2
+    # https://datatracker.ietf.org/doc/html/rfc7235#section-2.1
+    # https://datatracker.ietf.org/doc/html/rfc7617#section-2
     scheme, pos = parse_token(header, 0, "Authorization")
     if scheme.lower() != "basic":
         raise exceptions.InvalidHeaderValue(
@@ -580,7 +580,7 @@ def build_authorization_basic(username: str, password: str) -> str:
     This is the reverse of :func:`parse_authorization_basic`.
 
     """
-    # https://www.rfc-editor.org/rfc/rfc7617.html#section-2
+    # https://datatracker.ietf.org/doc/html/rfc7617#section-2
     assert ":" not in username
     user_pass = f"{username}:{password}"
     basic_credentials = base64.b64encode(user_pass.encode()).decode()
diff --git a/src/websockets/http11.py b/src/websockets/http11.py
index ed49fcbf9..b86c6ca4a 100644
--- a/src/websockets/http11.py
+++ b/src/websockets/http11.py
@@ -48,7 +48,7 @@ def d(value: bytes) -> str:
     return value.decode(errors="backslashreplace")
 
 
-# See https://www.rfc-editor.org/rfc/rfc7230.html#appendix-B.
+# See https://datatracker.ietf.org/doc/html/rfc7230#appendix-B.
 
 # Regex for validating header names.
 
@@ -122,7 +122,7 @@ def parse(
             ValueError: If the request isn't well formatted.
 
         """
-        # https://www.rfc-editor.org/rfc/rfc7230.html#section-3.1.1
+        # https://datatracker.ietf.org/doc/html/rfc7230#section-3.1.1
 
         # Parsing is simple because fixed values are expected for method and
         # version and because path isn't checked. Since WebSocket software tends
@@ -146,7 +146,7 @@ def parse(
 
         headers = yield from parse_headers(read_line)
 
-        # https://www.rfc-editor.org/rfc/rfc7230.html#section-3.3.3
+        # https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3
 
         if "Transfer-Encoding" in headers:
             raise NotImplementedError("transfer codings aren't supported")
@@ -227,7 +227,7 @@ def parse(
             ValueError: If the response isn't well formatted.
 
         """
-        # https://www.rfc-editor.org/rfc/rfc7230.html#section-3.1.2
+        # https://datatracker.ietf.org/doc/html/rfc7230#section-3.1.2
 
         try:
             status_line = yield from parse_line(read_line)
@@ -255,7 +255,7 @@ def parse(
 
         headers = yield from parse_headers(read_line)
 
-        # https://www.rfc-editor.org/rfc/rfc7230.html#section-3.3.3
+        # https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3
 
         if "Transfer-Encoding" in headers:
             raise NotImplementedError("transfer codings aren't supported")
@@ -324,7 +324,7 @@ def parse_headers(
         ValueError: If the request isn't well formatted.
 
     """
-    # https://www.rfc-editor.org/rfc/rfc7230.html#section-3.2
+    # https://datatracker.ietf.org/doc/html/rfc7230#section-3.2
 
     # We don't attempt to support obsolete line folding.
 
@@ -378,7 +378,7 @@ def parse_line(
         line = yield from read_line(MAX_LINE_LENGTH)
     except RuntimeError:
         raise exceptions.SecurityError("line too long")
-    # Not mandatory but safe - https://www.rfc-editor.org/rfc/rfc7230.html#section-3.5
+    # Not mandatory but safe - https://datatracker.ietf.org/doc/html/rfc7230#section-3.5
     if not line.endswith(b"\r\n"):
         raise EOFError("line without CRLF")
     return line[:-2]
diff --git a/src/websockets/legacy/http.py b/src/websockets/legacy/http.py
index b5df7e4c4..a7c8a927e 100644
--- a/src/websockets/legacy/http.py
+++ b/src/websockets/legacy/http.py
@@ -22,7 +22,7 @@ def d(value: bytes) -> str:
     return value.decode(errors="backslashreplace")
 
 
-# See https://www.rfc-editor.org/rfc/rfc7230.html#appendix-B.
+# See https://datatracker.ietf.org/doc/html/rfc7230#appendix-B.
 
 # Regex for validating header names.
 
@@ -64,7 +64,7 @@ async def read_request(stream: asyncio.StreamReader) -> tuple[str, Headers]:
         ValueError: If the request isn't well formatted.
 
     """
-    # https://www.rfc-editor.org/rfc/rfc7230.html#section-3.1.1
+    # https://datatracker.ietf.org/doc/html/rfc7230#section-3.1.1
 
     # Parsing is simple because fixed values are expected for method and
     # version and because path isn't checked. Since WebSocket software tends
@@ -111,7 +111,7 @@ async def read_response(stream: asyncio.StreamReader) -> tuple[int, str, Headers
         ValueError: If the response isn't well formatted.
 
     """
-    # https://www.rfc-editor.org/rfc/rfc7230.html#section-3.1.2
+    # https://datatracker.ietf.org/doc/html/rfc7230#section-3.1.2
 
     # As in read_request, parsing is simple because a fixed value is expected
     # for version, status_code is a 3-digit number, and reason can be ignored.
@@ -150,7 +150,7 @@ async def read_headers(stream: asyncio.StreamReader) -> Headers:
     Non-ASCII characters are represented with surrogate escapes.
 
     """
-    # https://www.rfc-editor.org/rfc/rfc7230.html#section-3.2
+    # https://datatracker.ietf.org/doc/html/rfc7230#section-3.2
 
     # We don't attempt to support obsolete line folding.
 
@@ -195,7 +195,7 @@ async def read_line(stream: asyncio.StreamReader) -> bytes:
     # Security: this guarantees header values are small (hard-coded = 8 KiB)
     if len(line) > MAX_LINE_LENGTH:
         raise SecurityError("line too long")
-    # Not mandatory but safe - https://www.rfc-editor.org/rfc/rfc7230.html#section-3.5
+    # Not mandatory but safe - https://datatracker.ietf.org/doc/html/rfc7230#section-3.5
     if not line.endswith(b"\r\n"):
         raise EOFError("line without CRLF")
     return line[:-2]
diff --git a/src/websockets/legacy/protocol.py b/src/websockets/legacy/protocol.py
index 120ff8e73..6f8916576 100644
--- a/src/websockets/legacy/protocol.py
+++ b/src/websockets/legacy/protocol.py
@@ -80,14 +80,14 @@ class WebSocketCommonProtocol(asyncio.Protocol):
     especially in the presence of proxies with short timeouts on inactive
     connections. Set ``ping_interval`` to :obj:`None` to disable this behavior.
 
-    .. _Ping: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.5.2
+    .. _Ping: https://datatracker.ietf.org/doc/html/rfc6455#section-5.5.2
 
     If the corresponding Pong_ frame isn't received within ``ping_timeout``
     seconds, the connection is considered unusable and is closed with code 1011.
     This ensures that the remote endpoint remains responsive. Set
     ``ping_timeout`` to :obj:`None` to disable this behavior.
 
-    .. _Pong: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.5.3
+    .. _Pong: https://datatracker.ietf.org/doc/html/rfc6455#section-5.5.3
 
     See the discussion of :doc:`timeouts <../../topics/timeouts>` for details.
 
@@ -447,7 +447,7 @@ def close_code(self) -> int | None:
         WebSocket close code, defined in `section 7.1.5 of RFC 6455`_.
 
         .. _section 7.1.5 of RFC 6455:
-            https://www.rfc-editor.org/rfc/rfc6455.html#section-7.1.5
+            https://datatracker.ietf.org/doc/html/rfc6455#section-7.1.5
 
         :obj:`None` if the connection isn't closed yet.
 
@@ -465,7 +465,7 @@ def close_reason(self) -> str | None:
         WebSocket close reason, defined in `section 7.1.6 of RFC 6455`_.
 
         .. _section 7.1.6 of RFC 6455:
-            https://www.rfc-editor.org/rfc/rfc6455.html#section-7.1.6
+            https://datatracker.ietf.org/doc/html/rfc6455#section-7.1.6
 
         :obj:`None` if the connection isn't closed yet.
 
@@ -516,8 +516,8 @@ async def recv(self) -> Data:
             A string (:class:`str`) for a Text_ frame. A bytestring
             (:class:`bytes`) for a Binary_ frame.
 
-            .. _Text: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
-            .. _Binary: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
+            .. _Text: https://datatracker.ietf.org/doc/html/rfc6455#section-5.6
+            .. _Binary: https://datatracker.ietf.org/doc/html/rfc6455#section-5.6
 
         Raises:
             ConnectionClosed: When the connection is closed.
@@ -583,8 +583,8 @@ async def send(
         bytes-like object (:class:`bytes`, :class:`bytearray`, or
         :class:`memoryview`) is sent as a Binary_ frame.
 
-        .. _Text: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
-        .. _Binary: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
+        .. _Text: https://datatracker.ietf.org/doc/html/rfc6455#section-5.6
+        .. _Binary: https://datatracker.ietf.org/doc/html/rfc6455#section-5.6
 
         :meth:`send` also accepts an iterable or an asynchronous iterable of
         strings, bytestrings, or bytes-like objects to enable fragmentation_.
@@ -592,7 +592,7 @@ async def send(
         All items must be of the same type, or else :meth:`send` will raise a
         :exc:`TypeError` and the connection will be closed.
 
-        .. _fragmentation: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.4
+        .. _fragmentation: https://datatracker.ietf.org/doc/html/rfc6455#section-5.4
 
         :meth:`send` rejects dict-like objects because this is often an error.
         (If you want to send the keys of a dict-like object as fragments, call
@@ -803,7 +803,7 @@ async def ping(self, data: Data | None = None) -> Awaitable[float]:
         """
         Send a Ping_.
 
-        .. _Ping: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.5.2
+        .. _Ping: https://datatracker.ietf.org/doc/html/rfc6455#section-5.5.2
 
         A ping may serve as a keepalive, as a check that the remote endpoint
         received all messages up to this point, or to measure :attr:`latency`.
@@ -862,7 +862,7 @@ async def pong(self, data: Data = b"") -> None:
         """
         Send a Pong_.
 
-        .. _Pong: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.5.3
+        .. _Pong: https://datatracker.ietf.org/doc/html/rfc6455#section-5.5.3
 
         An unsolicited pong may serve as a unidirectional heartbeat.
 
@@ -1559,8 +1559,8 @@ def broadcast(
     object (:class:`bytes`, :class:`bytearray`, or :class:`memoryview`) is sent
     as a Binary_ frame.
 
-    .. _Text: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
-    .. _Binary: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
+    .. _Text: https://datatracker.ietf.org/doc/html/rfc6455#section-5.6
+    .. _Binary: https://datatracker.ietf.org/doc/html/rfc6455#section-5.6
 
     :func:`broadcast` pushes the message synchronously to all connections even
     if their write buffers are overflowing. There's no backpressure.
diff --git a/src/websockets/legacy/server.py b/src/websockets/legacy/server.py
index cd7980e00..d230f009e 100644
--- a/src/websockets/legacy/server.py
+++ b/src/websockets/legacy/server.py
@@ -388,7 +388,7 @@ def process_origin(
 
         """
         # "The user agent MUST NOT include more than one Origin header field"
-        # per https://www.rfc-editor.org/rfc/rfc6454.html#section-7.3.
+        # per https://datatracker.ietf.org/doc/html/rfc6454#section-7.3.
         try:
             origin = headers.get("Origin")
         except MultipleValuesError as exc:
diff --git a/src/websockets/protocol.py b/src/websockets/protocol.py
index 7f2b45c74..917c19163 100644
--- a/src/websockets/protocol.py
+++ b/src/websockets/protocol.py
@@ -175,7 +175,7 @@ def close_code(self) -> int | None:
         `WebSocket close code`_.
 
         .. _WebSocket close code:
-            https://www.rfc-editor.org/rfc/rfc6455.html#section-7.1.5
+            https://datatracker.ietf.org/doc/html/rfc6455#section-7.1.5
 
         :obj:`None` if the connection isn't closed yet.
 
@@ -193,7 +193,7 @@ def close_reason(self) -> str | None:
         `WebSocket close reason`_.
 
         .. _WebSocket close reason:
-            https://www.rfc-editor.org/rfc/rfc6455.html#section-7.1.6
+            https://datatracker.ietf.org/doc/html/rfc6455#section-7.1.6
 
         :obj:`None` if the connection isn't closed yet.
 
diff --git a/src/websockets/server.py b/src/websockets/server.py
index 7211d3cbf..1b4c3bf29 100644
--- a/src/websockets/server.py
+++ b/src/websockets/server.py
@@ -307,7 +307,7 @@ def process_origin(self, headers: Headers) -> Origin | None:
 
         """
         # "The user agent MUST NOT include more than one Origin header field"
-        # per https://www.rfc-editor.org/rfc/rfc6454.html#section-7.3.
+        # per https://datatracker.ietf.org/doc/html/rfc6454#section-7.3.
         try:
             origin = headers.get("Origin")
         except MultipleValuesError as exc:
diff --git a/src/websockets/sync/connection.py b/src/websockets/sync/connection.py
index 2bcb3aa0e..a4826c785 100644
--- a/src/websockets/sync/connection.py
+++ b/src/websockets/sync/connection.py
@@ -189,8 +189,8 @@ def recv(self, timeout: float | None = None) -> Data:
             A string (:class:`str`) for a Text_ frame or a bytestring
             (:class:`bytes`) for a Binary_ frame.
 
-            .. _Text: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
-            .. _Binary: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
+            .. _Text: https://datatracker.ietf.org/doc/html/rfc6455#section-5.6
+            .. _Binary: https://datatracker.ietf.org/doc/html/rfc6455#section-5.6
 
         Raises:
             ConnectionClosed: When the connection is closed.
@@ -222,8 +222,8 @@ def recv_streaming(self) -> Iterator[Data]:
             An iterator of strings (:class:`str`) for a Text_ frame or
             bytestrings (:class:`bytes`) for a Binary_ frame.
 
-            .. _Text: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
-            .. _Binary: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
+            .. _Text: https://datatracker.ietf.org/doc/html/rfc6455#section-5.6
+            .. _Binary: https://datatracker.ietf.org/doc/html/rfc6455#section-5.6
 
         Raises:
             ConnectionClosed: When the connection is closed.
@@ -250,8 +250,8 @@ def send(self, message: Data | Iterable[Data]) -> None:
         bytes-like object (:class:`bytes`, :class:`bytearray`, or
         :class:`memoryview`) is sent as a Binary_ frame.
 
-        .. _Text: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
-        .. _Binary: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
+        .. _Text: https://datatracker.ietf.org/doc/html/rfc6455#section-5.6
+        .. _Binary: https://datatracker.ietf.org/doc/html/rfc6455#section-5.6
 
         :meth:`send` also accepts an iterable of strings, bytestrings, or
         bytes-like objects to enable fragmentation_. Each item is treated as a
@@ -259,7 +259,7 @@ def send(self, message: Data | Iterable[Data]) -> None:
         same type, or else :meth:`send` will raise a :exc:`TypeError` and the
         connection will be closed.
 
-        .. _fragmentation: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.4
+        .. _fragmentation: https://datatracker.ietf.org/doc/html/rfc6455#section-5.4
 
         :meth:`send` rejects dict-like objects because this is often an error.
         (If you really want to send the keys of a dict-like object as fragments,
@@ -425,7 +425,7 @@ def ping(self, data: Data | None = None) -> threading.Event:
         """
         Send a Ping_.
 
-        .. _Ping: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.5.2
+        .. _Ping: https://datatracker.ietf.org/doc/html/rfc6455#section-5.5.2
 
         A ping may serve as a keepalive or as a check that the remote endpoint
         received all messages up to this point
@@ -470,7 +470,7 @@ def pong(self, data: Data = b"") -> None:
         """
         Send a Pong_.
 
-        .. _Pong: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.5.3
+        .. _Pong: https://datatracker.ietf.org/doc/html/rfc6455#section-5.5.3
 
         An unsolicited pong may serve as a unidirectional heartbeat.
 
diff --git a/src/websockets/typing.py b/src/websockets/typing.py
index 6360c7a0a..447fe79da 100644
--- a/src/websockets/typing.py
+++ b/src/websockets/typing.py
@@ -24,8 +24,8 @@
 """Types supported in a WebSocket message:
 :class:`str` for a Text_ frame, :class:`bytes` for a Binary_.
 
-.. _Text: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
-.. _Binary : https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
+.. _Text: https://datatracker.ietf.org/doc/html/rfc6455#section-5.6
+.. _Binary : https://datatracker.ietf.org/doc/html/rfc6455#section-5.6
 
 """
 
diff --git a/src/websockets/uri.py b/src/websockets/uri.py
index 5cb38a9cc..82b35f92a 100644
--- a/src/websockets/uri.py
+++ b/src/websockets/uri.py
@@ -23,7 +23,7 @@ class WebSocketURI:
         username: Available when the URI contains `User Information`_.
         password: Available when the URI contains `User Information`_.
 
-    .. _User Information: https://www.rfc-editor.org/rfc/rfc3986.html#section-3.2.1
+    .. _User Information: https://datatracker.ietf.org/doc/html/rfc3986#section-3.2.1
 
     """