diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 53ea64bcfc6..bc13d67d051 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -352,7 +352,8 @@ Currently, we have the following branches in use:
 
 | Branch    |           |
 | --------- | --------- |
-| master    | Active development branch for PHP 8.3, which is open for backwards incompatible changes and major internal API changes. |
+| master    | Active development branch for PHP 8.4, which is open for backwards incompatible changes and major internal API changes. |
+| PHP-8.3   | Is used to release the PHP 8.3.x series. This is a current stable version and is open for bugfixes only. |
 | PHP-8.2   | Is used to release the PHP 8.2.x series. This is a current stable version and is open for bugfixes only. |
 | PHP-8.1   | Is used to release the PHP 8.1.x series. This is a current stable version and is open for bugfixes only. |
 | PHP-8.0   | Is used to release the PHP 8.0.x series. This is an old stable version and is open for security fixes only. |
diff --git a/UPGRADING b/UPGRADING
index 972ba3f48d6..738c11675a9 100644
--- a/UPGRADING
+++ b/UPGRADING
@@ -1,4 +1,4 @@
-PHP 8.3 UPGRADE NOTES
+PHP 8.4 UPGRADE NOTES
 
 1. Backward Incompatible Changes
 2. New Features
@@ -19,434 +19,26 @@ PHP 8.3 UPGRADE NOTES
 1. Backward Incompatible Changes
 ========================================
 
-- Core:
-  . Programs that were very close to overflowing the call stack may now throw an
-    Error when using more than
-    `zend.max_allowed_stack_size-zend.reserved_stack_size` bytes of stack
-    (`fiber.stack_size-zend.reserved_stack_size` for fibers).
-  . Executing proc_get_status() multiple times will now always return the right
-    value on posix systems. Previously, only the first call of the function
-    returned the right value. Executing proc_close() after proc_get_status()
-    will now also return the right exit code. Previously this would return -1.
-    Internally, this works by caching the result on posix systems. If you want
-    the old behaviour, you can check the "cached" key in the array returned by
-    proc_get_status() to check whether the result was cached.
-  . Zend Max Execution Timers is now enabled by default for ZTS builds on
-    Linux.
-  . Uses of traits with static properties will now redeclare static properties
-    inherited from the parent class. This will create a separate static
-    property storage for the current class. This is analogous to adding the
-    static property to the class directly without traits.
-  . Assigning a negative index n to an empty array will now make sure that the
-    next index is n+1 instead of 0.
-  . Class constant visibility variance is now correctly checked when inherited
-    from interfaces.
-  . WeakMaps entries whose key maps to itself (possibly transitively) may now
-    be removed during cycle collection if the key is not reachable except by
-    iterating over the WeakMap (reachability via iteration is considered weak).
-    Previously, such entries would never be automatically removed.
-
-- DOM:
-  . DOMChildNode::after(), DOMChildNode::before(), DOMChildNode::replaceWith()
-    on a node that has no parent is now a no-op instead of a hierarchy
-    exception, which is the behaviour spec demands.
-  . Using the DOMParentNode and DOMChildNode methods without a document now
-    works instead of throwing a HIERARCHY_REQUEST_ERR DOMException. This is in
-    line with the behaviour spec demands.
-  . createAttributeNS() without specifying a prefix would incorrectly create
-    a default namespace, placing the element inside the namespace instead of
-    the attribute. This bug is now fixed.
-  . createAttributeNS() would previously incorrectly throw a NAMESPACE_ERR
-    when the prefix was already used for a different uri. It now correctly
-    chooses a different prefix when there's a prefix name conflict.
-
-- FFI:
-  . C functions that have a return type of void now return null instead of
-    returning the following object object(FFI\CData:void) { }
-
-- Opcache:
-  . The opcache.consistency_checks INI directive was removed. This feature was
-    broken with the tracing JIT, as well as with inheritance cache, and has
-    been disabled without a way to enable it since PHP 8.1.18 and PHP 8.2.5.
-    Both the tracing JIT and inheritance cache may modify shm after the script
-    has been persisted by invalidating its checksum. The attempted fix skipped
-    over the modifiable pointers but was rejected due to complexity. For this
-    reason, it was decided to remove the feature instead.
-
-- Phar:
-  . The type of Phar class constants are now declared.
-
-- Standard:
-  . The range() function has had various changes:
-    * A TypeError is now thrown when passing objects, resources, or arrays
-      as the boundary inputs
-    * A more descriptive ValueError is thrown when passing 0 for $step
-    * A ValueError is now thrown when using a negative $step for increasing ranges
-    * If $step is a float that can be interpreted as an int, it is now done so
-    * A ValueError is now thrown if any argument is infinity or NAN
-    * An E_WARNING is now emitted if $start or $end is the empty string.
-      The value continues to be cast to the value 0.
-    * An E_WARNING is now emitted if $start or $end has more than one byte,
-      only if it is a non-numeric string.
-    * An E_WARNING is now emitted if $start or $end is cast to an integer
-      because the other boundary input is a number. (e.g. range(5, 'z');)
-    * An E_WARNING is now emitted if $step is a float when trying to generate
-      a range of characters, except if both boundary inputs are numeric strings
-      (e.g. range('5', '9', 0.5); does not produce a warning)
-    * range() now produce a list of characters if one of the boundary inputs is
-      a string digit instead of casting the other input to int
-      (e.g. range('5', 'z');)
-  . The file() flags error check now catches all invalid flags. Notably
-    FILE_APPEND was previously silently accepted.
-
-- SNMP:
-  . The type of SNMP class constants are now declared.
-
 ========================================
 2. New Features
 ========================================
 
-- Core
-  . Anonymous classes may now be marked as readonly.
-  . Readonly properties can now be reinitialized during cloning.
-    RFC: https://wiki.php.net/rfc/readonly_amendments
-  . Class, interface, trait, and enum constants now support type
-    declarations. RFC: https://wiki.php.net/rfc/typed_class_constants
-  . Closures created from magic methods can now accept named arguments.
-  . The final modifier may now be used when using a method from a trait.
-  . Added the #[\Override] attribute to check that a method exists
-    in a parent class or implemented interface.
-    RFC: https://wiki.php.net/rfc/marking_overriden_methods
-  . Class constants can now be accessed dynamically using the C::{$name}
-    syntax.
-    RFC: https://wiki.php.net/rfc/dynamic_class_constant_fetch
-  . Static variable initializers can now contain arbitrary expressions.
-    RFC: https://wiki.php.net/rfc/arbitrary_static_variable_initializers
-
-- CLI
-  . It is now possible to lint multiple files.
-
-- FFI
-  . It is now possible to assign CData to other CData. This means you can
-    now assign CData to structs and fields.
-
-- Opcache
-  . opcache_get_status()['scripts'][n]['revalidate'] now contains a Unix
-    timestamp of when the next revalidation of the scripts timestamp is due,
-    dictated by the opcache.revalidate_freq INI directive.
-
-- Posix
-  . posix_getrlimit() now takes an optional $res parameter to allow fetching a
-    single resource limit.
-  . posix_isatty() now raises type warnings for integers following the usual
-    ZPP semantics.
-  . posix_ttyname() now raises type warnings for integers following the usual
-    ZPP semantics and value warnings for invalid file descriptor integers.
-
-- Streams
-  . Streams can now emit the STREAM_NOTIFY_COMPLETED notification. This was
-    previously not implemented.
-
 ========================================
 3. Changes in SAPI modules
 ========================================
 
-- $_SERVER['SERVER_SOFTWARE'] value from the built-in CLI server changed to
-  make it compliant with RFC3875.
-
 ========================================
 4. Deprecated Functionality
 ========================================
 
-- Core
-  . Using the ++ operator on empty, non-numeric, or non-alphanumeric strings
-    is now deprecated. Moreover, incrementing non-numeric strings is soft
-    deprecated and the new str_increment() function should be used instead.
-    RFC: https://wiki.php.net/rfc/saner-inc-dec-operators
-  . Using the -- operator on empty or non-numeric strings is now deprecated.
-    RFC: https://wiki.php.net/rfc/saner-inc-dec-operators
-  . Calling get_class() and get_parent_class() without arguments is now
-    deprecated.
-
-- DBA
-  . Calling dba_fetch() with $dba as the 3rd argument is now deprecated.
-
-- FFI
-  . Calling FFI::cast(), FFI::new(), and FFI::type() statically is now
-    deprecated.
-
-- Intl
-  . The U_MULTIPLE_DECIMAL_SEP*E*RATORS constant had been deprecated, using
-    the U_MULTIPLE_DECIMAL_SEP*A*RATORS instead is recommended.
-  . The NumberFormatter::TYPE_CURRENCY has been deprecated.
-
-- LDAP
-  . Calling ldap_connect() with separate hostname and port is deprecated.
-    RFC: https://wiki.php.net/rfc/deprecations_php_8_3#deprecate_calling_ldap_connect_with_2_parameters
-
-- MBString
-  . Passing a negative $width to mb_strimwidth() is now deprecated.
-
-- Phar
-  . Calling Phar::setStub() with a resource and a length is now deprecated.
-    Such calls should be replaced by:
-    $phar->setStub(stream_get_contents($resource));
-
-- Random
-  . The MT_RAND_PHP Mt19937 variant is deprecated.
-    RFC: https://wiki.php.net/rfc/deprecations_php_8_3#mt_rand_php
-
-- Standard:
-  . The assert_options() function is now deprecated.
-  . The ASSERT_ACTIVE, ASSERT_BAIL, ASSERT_CALLBACK, ASSERT_EXCEPTION, and
-    ASSERT_WARNING constants have been deprecated.
-    RFC: https://wiki.php.net/rfc/assert-string-eval-cleanup
-
-- SQLite3
-  . Using exceptions is now preferred, warnings will be removed in the future.
-    Calling SQLite3::enableExceptions(false) will trigger a depreciation
-    warning in this version.
-
-- Zip:
-  . The ZipArchive::FL_RECOMPRESS constant is deprecated and will be removed
-    in a future version of libzip
-
 ========================================
 5. Changed Functions
 ========================================
 
-- Core:
-  . gc_status() has added the following 8 fields:
-    "running" => bool
-    "protected" => bool
-    "full" => bool
-    "buffer_size" => int
-    "application_time" => float: Total application time, in seconds (including
-    collector_time)
-    "collector_time" => float: Time spent collecting cycles, in seconds
-    (including destructor_time and free_time)
-    "destructor_time" => float: Time spent executing destructors during
-    cycle collection, in seconds
-    "free_time" => float: Time spent freeing values during cycle collection, in
-    seconds
-    See GH-9336, GH-11523
-  . class_alias() now supports creating an alias of an internal class.
-  . Setting `open_basedir` at runtime using `ini_set('open_basedir', ...);` no
-    longer accepts paths containing the parent directory (`..`). Previously,
-    only paths starting with `..` were disallowed. This could easily be
-    circumvented by prepending `./` to the path.
-  . User exception handlers now catch exceptions during shutdown.
-  . The resultant HTML of highlight_string and highlight_file has changed.
-    Whitespace between outer HTML tags is removed. Newlines and spaces
-    are no longer converted to HTML entities. The whole HTML is now wrapped in
-    <pre> tag. The outer <span> has been merged with <code>.
-
-- Calendar
-  . easter_date() now supports years from 1970 to 2,000,000,000 on 64-bit
-    systems, previously it only supported years in the range from 1970 to 2037.
-
-- Curl:
-  . curl_getinfo() now supports two new constants: CURLINFO_CAPATH and
-    CURLINFO_CAINFO. If option is null, the following two additional keys are
-    present: "capath" and "cainfo".
-
-- Dom:
-  . Changed DOMCharacterData::appendData() tentative return type to true.
-  . DOMDocument::loadHTML(), DOMDocument::loadHTMLFile(),
-    DOMDocument::loadXML() and DOMDocument::loadXMLFile() now have a tentative
-    return type of bool. Previously, this was documented as having a return
-    type of DOMDocument|bool, but DOMDocument cannot be returned since PHP 8.0
-    as it is no longer statically callable.
-
-- Gd:
-  . Changed imagerotate signature, removed the `ignore_transparent` argument
-    as it was not used internally anyway from PHP 7.x.
-
-- Intl:
-  . datefmt_set_timezone (and its alias IntlDateformatter::setTimeZone)
-    now returns true on success, previously null was returned.
-  . IntlBreakiterator::setText() now returns false on failure, previously
-    null was returned.
-    now returns true on success, previously null was returned.
-  . IntlChar::enumCharNames is now returning a boolean.
-    Previously it returned null on success and false on failure.
-
-- MBString:
-  . mb_strtolower, mb_strtotitle, and mb_convert_case implement conditional
-    casing rules for the Greek letter sigma. For mb_convert_case, conditional
-    casing only applies to MB_CASE_LOWER and MB_CASE_TITLE modes, not to
-    MB_CASE_LOWER_SIMPLE and MB_CASE_TITLE_SIMPLE.
-  . mb_decode_mimeheader interprets underscores in QPrint-encoded MIME
-    encoded words as required by RFC 2047; they are converted to spaces.
-    Underscores must be encoded as "=5F" in such MIME encoded words.
-  . In rare cases, mb_encode_mimeheader will transfer-encode its input
-    string where it would pass it through as raw ASCII in PHP 8.2.
-  . mb_encode_mimeheader no longer drops NUL (zero) bytes when
-    QPrint-encoding the input string. This previously caused strings in
-    certain text encodings, especially UTF-16 and UTF-32, to be
-    corrupted by mb_encode_mimeheader.
-  . mb_detect_encoding's "non-strict" mode now behaves as described in the
-    documentation. Previously, it would return false if the same byte
-    (for example, the first byte) of the input string was invalid in all
-    candidate encodings. More generally, it would eliminate candidate
-    encodings from consideration when an invalid byte was seen, and if the
-    same input byte eliminated all remaining encodings still under
-    consideration, it would return false. On the other hand, if all candidate
-    encodings but one were eliminated from consideration, it would return the
-    last remaining one without regard for how many encoding errors might be
-    encountered later in the string. This is different from the behavior
-    described in the documentation, which says: "If strict is set to false,
-    the closest matching encoding will be returned."
-
-- mysqli:
-  . mysqli_fetch_object now raises a ValueError instead of an Exception when
-    the constructor_args argument is non empty with the class not having
-    constructor.
-  . mysqli_poll now raises a ValueError when the read nor error arguments are
-    passed.
-  . mysqli_field_seek and mysqli_result::field_seek now specify return type
-    as true instead of bool.
-
-- ODBC
-  . odbc_autocommit() now accepts null for the $enable parameter.
-    Passing null has the same behaviour as passing only 1 parameter,
-    namely indicating if the autocommit feature is enabled or not.
-
-- PGSQL:
-  . pg_fetch_object now raises a ValueError instead of an Exception when the
-    constructor_args argument is non empty with the class not having
-    constructor.
-  . pg_insert now raises a ValueError instead of a WARNING when the table
-    specified is invalid.
-  . pg_insert and pg_convert raises a ValueError or a TypeError instead of a
-    WARNING when the value/type of a field does not match properly with a
-    PostGreSQL's type.
-  . The $row param of pg_fetch_result(), pg_field_prtlen() and
-    pg_field_is_null() is now nullable.
-
-- Random:
-  . Changed mt_srand() and srand() to not check the number of arguments to
-    determine whether a random seed should be used. Passing null will generate
-    a random seed, 0 will use zero as the seed. The functions are now
-    consistent with Mt19937::__construct().
-
-- Reflection:
-  . Return type of ReflectionClass::getStaticProperties() is no longer nullable.
-  . Calling ReflectionProperty::setValue() with only one parameter is deprecated.
-    To set static properties, pass null as the first parameter.
-
-- Standard:
-  . E_NOTICEs emitted by unserialize() have been promoted to E_WARNING.
-    RFC: https://wiki.php.net/rfc/improve_unserialize_error_handling
-  . unserialize() now emits a new E_WARNING if the input contains unconsumed
-    bytes.
-    RFC: https://wiki.php.net/rfc/unserialize_warn_on_trailing_data
-  . array_pad() is now only limited by the maximum number of elements an array
-    can have. Before, it was only possible to add at most 1048576 elements at a
-    time.
-  . strtok() raises a warning in the case token is not provided when starting
-    tokenization.
-  . password_hash() will now chain the underlying Random\RandomException
-    as the ValueError’s $previous Exception when salt generation fails.
-  . proc_open() $command array must now have at least one non empty element.
-  . array_sum() and array_product() now warn when values in the array cannot
-    be converted to int/float. Previously arrays and objects where ignored
-    whilst every other value was cast to int. Moreover, objects that define
-    a numeric cast (e.g. GMP) are now casted instead of ignored.
-    RFC: https://wiki.php.net/rfc/saner-array-sum-product
-  . number_format() $decimal parameter handles rounding to negative places. It
-    means that when $decimals is negative, $num is rounded to $decimals
-    significant digits before the decimal point. Previously negative $decimals
-    got silently ignored and the number got rounded to zero decimal places.
-  . The $before_needle argument added to strrchr() which works in the same way
-    like its counterpart in strstr() or stristr().
-  . str_getcsv() and fgetcsv() return empty string instead of a string with
-    a single zero byte for the last field which contains only unterminated
-    enclosure.
-
 ========================================
 6. New Functions
 ========================================
 
-- Date:
-  . Added DatePeriod::createFromISO8601String() as a replacement for the
-    overloaded constructor of DatePeriod.
-
-- DOM:
-  . Added DOMNode::contains() and DOMNameSpaceNode::contains().
-  . Added DOMElement::getAttributeNames().
-  . Added DOMNode::getRootNode(). The $options argument does nothing at the
-    moment because it only influences the shadow DOM, which we do not support
-    yet.
-  . Added DOMElement::className and DOMElement::id.
-    This is not binary-safe at the moment because of underlying limitations of
-    libxml2.
-  . Added DOMParentNode::replaceChildren().
-  . Added DOMNode::isConnected and DOMNameSpaceNode::isConnected.
-  . Added DOMNode::parentElement and DOMNameSpaceNode::parentElement.
-  . Added DOMNode::isEqualNode().
-  . Added DOMElement::insertAdjacentElement() and
-    DOMElement::insertAdjacentText().
-  . Added DOMElement::toggleAttribute().
-
-- Intl:
-  . Added IntlCalendar::setDate() and IntlCalendar::setDateTime()
-    as partial replacements for the overloaded IntlCalendar::set() method.
-  . Added IntlGregorianCalendar::createFromDate() and
-    IntlGregorianCalendar::createFromDateTime()
-    as partial replacements for the overloaded IntlGregorianCalendar
-    constructor.
-
-- JSON:
-  . Added json_validate(), which returns whether the json is valid for
-    the given $depth and $options.
-    RFC: https://wiki.php.net/rfc/json_validate
-
-- LDAP:
-  . Added ldap_connect_wallet().
-  . Added ldap_exop_sync().
-
-- MBString:
-  . Added mb_str_pad(), which is the mbstring equivalent of str_pad().
-    RFC: https://wiki.php.net/rfc/mb_str_pad
-
-- Posix:
-  . Added posix_sysconf call to get runtime informations.
-  . Added posix_pathconf call to get configuration value from a directory/file.
-  . Added posix_fpathconf call to get configuration value from a file
-    descriptor.
-  . Added posix_eaccess call to check the effective user id's permission for
-    a path.
-
-- PGSQL:
-  . Added pg_set_error_context_visibility to set the visibility of the context
-    in error messages (with libpq >= 9.6).
-  . Added pg_enter_pipeline_mode().
-  . Added pg_exit_pipeline_mode().
-  . Added pg_pipeline_sync().
-  . Added pg_pipeline_status().
-
-- Random:
-  . Added Randomizer::getBytesFromString().
-    RFC: https://wiki.php.net/rfc/randomizer_additions
-  . Added Randomizer::nextFloat(), ::getFloat(), and IntervalBoundary.
-    RFC: https://wiki.php.net/rfc/randomizer_additions
-
-- Reflection:
-  . Added ReflectionMethod::createFromMethodName().
-
-- Sockets:
-  . Added socket_atmark to checks if the socket is OOB marked.
-
-- Standard:
-  . Added the str_increment() and str_decrement() functions.
-    RFC: https://wiki.php.net/rfc/saner-inc-dec-operators
-  . Added stream_context_set_options() as a replacement for
-    stream_context_set_option() when passed an array of options.
-
-- Zip:
-  . Added ZipArchive::setArchiveFlag and ZipArchive::getArchiveFlag methods.
-
 ========================================
 7. New Classes and Interfaces
 ========================================
@@ -459,220 +51,23 @@ PHP 8.3 UPGRADE NOTES
 9. Other Changes to Extensions
 ========================================
 
-- Core:
-  . WeakMaps now have ephemeron-like behavior: Entries whose key maps to itself
-    (possibly transitively) may be removed during cycle collection if the key
-    is not reachable except by iterating over the WeakMap (reachability via
-    iteration is considered weak). Previously, such entries would never be
-    automatically removed. (See GH-10932.)
-  . The ++ and -- operators now emit warnings when attempting to increment
-    values of type bool as this will change in the next major version.
-    A warning is emitted when trying to decrement values of type null, as
-    this will change in the next major version.
-    Internal objects that implement an _IS_NUMBER cast but not a do_operator
-    handler that overrides addition and subtraction now can be incremented
-    and decrement as if one would do $o += 1 or $o -= 1
-
-- DOM:
-  . The DOM lifetime mechanism has been reworked such that implicitly removed
-    nodes can still be fetched. Previously this resulted in an exception.
-
-- SQLite3
-  . The SQLite3 class now throws \SQLite3Exception (extends \Exception) instead
-    of \Exception.
-  . The SQLite error code is now passed in the exception error code instead of
-    being included in the error message.
-
 ========================================
 10. New Global Constants
 ========================================
 
-- Curl:
-  . CURLINFO_CAPATH
-  . CURLINFO_CAINFO
-  . CURLOPT_MIME_OPTIONS
-  . CURLMIMEOPT_FORMESCAPE
-  . CURLOPT_WS_OPTIONS
-  . CURLWS_RAW_MODE
-  . CURLOPT_SSH_HOSTKEYFUNCTION
-  . CURLOPT_PROTOCOLS_STR
-  . CURLOPT_REDIR_PROTOCOLS_STR
-  . CURLOPT_CA_CACHE_TIMEOUT
-  . CURLOPT_QUICK_EXIT
-  . CURLKHMATCH_OK
-  . CURLKHMATCH_MISMATCH
-  . CURLKHMATCH_MISSING
-  . CURLKHMATCH_LAST
-
-- Intl:
-  . MIXED_NUMBERS (Spoofchecker).
-  . HIDDEN_OVERLAY (Spoofchecker).
-
-- OpenSSL:
-  . OPENSSL_CMS_OLDMIMETYPE
-  . PKCS7_NOOLDMIMETYPE
-
-- PCNTL:
-  . SIGINFO
-
-- PDO_ODBC
-  . PDO_ODBC_TYPE
-
-- PGSQL:
-  . PGSQL_TRACE_SUPPRESS_TIMESTAMPS
-  . PGSQL_TRACE_REGRESS_MODE
-  . PGSQL_ERRORS_SQLSTATE
-  . PGSQL_PIPELINE_SYNC
-  . PGSQL_PIPELINE_ON
-  . PGSQL_PIPELINE_OFF
-  . PGSQL_PIPELINE_ABORTED
-  . PGSQL_SHOW_CONTEXT_NEVER
-  . PGSQL_SHOW_CONTEXT_ERRORS
-  . PGSQL_SHOW_CONTEXT_ALWAYS
-
-- Posix:
-  . POSIX_SC_ARG_MAX
-  . POSIX_SC_PAGESIZE
-  . POSIX_SC_NPROCESSORS_CONF
-  . POSIX_SC_NPROCESSORS_ONLN
-  . POSIX_PC_LINK_MAX
-  . POSIX_PC_MAX_CANON
-  . POSIX_PC_MAX_INPUT
-  . POSIX_PC_NAME_MAX
-  . POSIX_PC_PATH_MAX
-  . POSIX_PC_PIPE_BUF
-  . POSIX_PC_CHOWN_RESTRICTED
-  . POSIX_PC_NO_TRUNC
-  . POSIX_PC_ALLOC_SIZE_MIN
-  . POSIX_PC_SYMLINK_MAX
-
-- Sockets:
-  . SO_ATTACH_REUSEPORT_CBPF (Linux only).
-  . SO_DETACH_BPF (Linux only).
-  . SO_DETACH_FILTER (Linux only).
-  . TCP_QUICKACK (Linux only).
-  . IP_DONTFRAG (FreeBSD only).
-  . IP_MTU_DISCOVER (Linux only).
-  . IP_PMTUDISC_DO (Linux only).
-  . IP_PMTUDISC_DONT (Linux only).
-  . IP_PMTUDISC_WANT (Linux only).
-  . IP_PMTUDISC_PROBE (Linux only).
-  . IP_PMTUDISC_INTERFACE (Linux only).
-  . IP_PMTUDISC_OMIT (Linux only).
-  . AF_DIVERT (FreeBSD only).
-  . SOL_UDPLITE.
-  . UDPLITE_RECV_CSCOV.
-  . UDPLITE_SEND_CSCOV.
-  . SO_RERROR (NetBSD only).
-  . SO_ZEROIZE (OpenBSD only).
-  . SO_SPLICE (OpenBSD only).
-  . TCP_REPAIR (Linux only).
-  . SO_REUSEPORT_LB (FreeBSD only).
-  . IP_BIND_ADDRESS_NO_PORT (Linux only).
-
-- Zip:
-  . ZipArchive::ER_DATA_LENGTH (libzip >= 1.10)
-  . ZipArchive::ER_NOT_ALLOWED (libzip >= 1.10)
-  . ZipArchive::AFL_RDONLY (libzip >= 1.10)
-  . ZipArchive::AFL_IS_TORRENTZIP (libzip >= 1.10)
-  . ZipArchive::AFL_WANT_TORRENTZIP (libzip >= 1.10)
-  . ZipArchive::AFL_CREATE_OR_KEEP_FILE_FOR_EMPTY_ARCHIVE (libzip >= 1.10)
-  . ZipArchive::FL_OPEN_FILE_NOW
-  . ZipArchive::LENGTH_TO_END as default value for addFile and replaceFile
-  . ZipArchive::LENGTH_UNCHECKED (libzip >= 1.10.1)
-
 ========================================
 11. Changes to INI File Handling
 ========================================
 
-- assert.*
-  . The assert.* INI settings have been deprecated.
-    This comprises the following INI settings:
-     - assert.active
-     - assert.bail
-     - assert.callback
-     - assert.exception
-     - assert.warning
-    If the value of the setting is equal to the default value, no deprecation
-    notice is emitted.
-    The zend.assertions INI setting should be used instead.
-
-- zend.max_allowed_stack_size
-  . New INI directive to set the maximum allowed stack size. Possible
-    values are `0` (detect the process or thread maximum stack size), `-1`
-    (no limit), or a positive number of bytes. The default is `0`. When it
-    is not possible to detect the the process or thread maximum stack size,
-    a known system default is used. Setting this value too high has the same
-    effect as disabling the stack size limit. Fibers use fiber.stack_size
-    as maximum allowed stack size. An Error is thrown when the process call
-    stack exceeds `zend.max_allowed_stack_size-zend.reserved_stack_size`
-    bytes, to prevent stack-overflow-induced segmentation faults, with
-    the goal of making debugging easier. The stack size increases during
-    uncontrolled recursions involving internal functions or the magic methods
-    __toString, __clone, __sleep, __destruct.  This is not related to stack
-    buffer overflows, and is not a security feature.
-
-- zend.reserved_stack_size
-  . New INI directive to set the reserved stack size, in bytes. This is
-    subtracted from the max allowed stack size, as a buffer, when checking the
-    stack size.
-
 ========================================
 12. Windows Support
 ========================================
 
-- Minimum supported Windows version has been bumped to Windows 8 or
-  Windows Server 2012
-
 ========================================
 13. Other Changes
 ========================================
 
-- Core:
-  . An Error is now thrown when the process call stack exceeds a certain size,
-    to prevent stack-overflow-induced segmentation faults, with the goal of
-    making debugging easier. The maximum allowed stack size is controlled
-    by the INI directives zend.max_allowed_stack_size,
-    zend.reserved_stack_size and fiber.stack_size.
-
-- FFI:
-  . FFI::load() is now allowed during preloading when opcache.preload_user is
-    the current system user. Previously, calling FFI::load() was not possible
-    during preloading if the opcache.preload_user directive was set.
-
-- FPM:
-  . FPM CLI test now fails if the socket path is longer than supported by OS.
-
-- Opcache:
-  . In the cli and phpdbg SAPIs, preloading does not require the
-    opcache.preload_user directive to be set anymore when running as root. In
-    other SAPIs, this directive is required when running as root because
-    preloading is done before the SAPI switches to an unprivileged user.
-
-- Streams:
-  . Blocking fread() on socket connection returns immediately if there are
-    any buffered data instead of waiting for more data.
-  . Memory stream no longer fails if seek offset is past the end. Instead
-    the memory is increase on the next write and date between the old end and
-    offset is filled with zero bytes in the same way how it works for files.
-  . stat() access operations like file_exists() and similar will now use real
-    path instead of the actual stream path. This is consistent with stream
-    opening.
-
 ========================================
 14. Performance Improvements
 ========================================
 
-- DOM:
-  . Looping over a DOMNodeList now uses caching. Therefore requesting items no
-    longer takes quadratic time by default.
-  . Getting text content from nodes now avoids an allocation, resulting in a
-    performance gain.
-  . DOMChildNode::remove() now runs in O(1) performance.
-
-- Standard:
-  . The file() flags error check is now about 7% faster.
-
-- SPL:
-  . RecursiveDirectoryIterator now performs less I/O when looping over a
-    directory.
diff --git a/UPGRADING.INTERNALS b/UPGRADING.INTERNALS
index f35d54846f2..18c651ecfa8 100644
--- a/UPGRADING.INTERNALS
+++ b/UPGRADING.INTERNALS
@@ -1,4 +1,4 @@
-PHP 8.3 INTERNALS UPGRADE NOTES
+PHP 8.4 INTERNALS UPGRADE NOTES
 
 1. Internal API changes
 
@@ -14,147 +14,14 @@ PHP 8.3 INTERNALS UPGRADE NOTES
 1. Internal API changes
 ========================
 
-* zend_class_entry now possesses a default_object_handlers field, which
-  provides a default object handler when create_object() is not overriding it.
-* Custom Fiber implementations have to initialize EG(stack_limit) and
-  EG(stack_base).
-* EG(opline_before_exception) may now be null if the VM throws an exception
-  before executing any opline.
-* Many C header files have been cleaned up and include dependencies
-  have been reduced.  Many headers which used to be always included by
-  Zend headers (e.g. "errno.h") are no longer implied, and this may
-  break the build of third-party extensions which relied on this
-  implementation detail.  Those extensions may need to add the missing
-  #include lines.
-* Since version 8, PHP requires a C99 compiler.  Configure-time checks
-  for C99 features have been removed and therefore macro definitions
-  from php_config.h have disappeared.  Do not use those feature
-  macros.
-* Internal class aliases created during request time can now exist in
-  the class table. zend_register_class_alias_ex() will not increase
-  the refcount for class aliases and the cleanup function takes this
-  into account.
-* The return types of the following functions have been changed from
-  `bool` to `zend_result`:
-  - zend_fiber_init_context()
-* The fast_add_function() has been removed, use add_function() that will
-  call the static inline add_function_fast() instead.
-* The order of members of zend_op_array, zend_ssa_var, zend_ssa_var_info,
-  zend_executor_globals and php_core_globals have changed to improve
-  struct packing which reduces their size.
-* Many calls to zend_assign_to_variable have been replaced with
-  zend_assign_to_variable_ex which allows delaying the releasing of the old
-  variable value. This avoids side-effects through destructors between the
-  assignment of the variable and the assignment to the result zval in the VM
-  (i.e. it may free the new value). See GH-10168 for details.
-* The return types of the following functions were changed from int to
-  zend_result:
-  - open_file_for_scanning
-  - php_rfc1867_callback
-  - virtual_chdir
-  - zend_execute_scripts
-  - zend_get_module_started
-  - zend_handle_undef_args
-  - zend_list_delete
-  - zend_multibyte_parse_encoding_list
-  - zend_multibyte_set_internal_encoding
-  - zend_parse_ini_file
-  - zend_parse_ini_string
-  - zend_set_user_opcode_handler
-  - zend_ssa_inference
-* Removed unused macros PHP_FNV1_32A_INIT and PHP_FNV1A_64_INIT. See GH-11114.
-* ext/standard/hrtime.h was moved to Zend/zend_hrtime.h
-  * The prefix of the PHP_HRTIME_ macros was changed to ZEND_HRTIME_
-  * The HRTIME_AVAILABLE macro was renamed to ZEND_HRTIME_AVAILABLE
-  * The php_hrtime_current() function was renamed to zend_hrtime()
-* _php_stream_dirent now has an extra d_type field that is used to store the
-  directory entry type. This can be used to avoid additional stat calls for
-  types when the type is already known.
-
 ========================
 2. Build system changes
 ========================
 
-* PHP_EXTRA_VERSION can be passed to configure script to control custom PHP
-  build versions: ./configure PHP_EXTRA_VERSION="-acme"
-
-* LDFLAGS are not unset anymore allowing them to be adjusted e.g.
-  LDFLAGS="..." ./configure
-
-* Removed the HAVE_DEV_URANDOM compile time check.  HAVE_DEV_URANDOM will
-  now never be defined. Any checks relying on HAVE_DEV_URANDOM should be
-  removed.  Even with HAVE_DEV_URANDOM it was not guaranteed that
-  /dev/urandom is actually available at run time and thus a runtime
-  check needs to happen in all cases.
-
 ========================
 3. Module changes
 ========================
 
- a. ext/json
-   - A new function php_json_validate_ex has been added to check if the
-     provided C string is valid for the given depth and options.
-
- b. ext/standard
-   - The PHPAPI php_url_encode_hash_ex() function has had its signature change
-     from:
-     PHPAPI void php_url_encode_hash_ex(HashTable *ht, smart_str *formstr,
-     				const char *num_prefix, size_t num_prefix_len,
-     				const char *key_prefix, size_t key_prefix_len,
-     				const char *key_suffix, size_t key_suffix_len,
-     				zval *type, const char *arg_sep, int enc_type);
-     to:
-     PHPAPI void php_url_encode_hash_ex(HashTable *ht, smart_str *formstr,
-     				const char *num_prefix, size_t num_prefix_len,
-     				const zend_string *key_prefix,
-     				zval *type, const zend_string *arg_sep, int enc_type);
-     The change to use zend_string prevent the computation of the arg_sep
-     length at each call. The key_suffix parameter was dropped as it was a
-     constant value and depended on the key_prefix parameter to not be NULL.
-
- c. ext/mysqlnd
-   - The function mysqlnd_shutdown and its corresponding internal methods
-   mysqlnd_command::shutdown & mysqlnd_conn_data::shutdown have been removed.
-   These functions are deprecated by MySQL in favour of SHUTDOWN SQL statement.
-
- d. ext/pcre
-   - The function pcre_get_compiled_regex_ex has been removed.
-   Use pcre_get_compiled_regex instead.
-
- e. ext/spl
-   - The PHPAPI spl_iterator_apply() function now returns zend_result instead of int.
-     There are no functional changes.
-   - The field _spl_filesystem_object->is_recursive has been removed.
-
- f. ext/dom
-   - A new function dom_get_doc_props_read_only() is added to gather the document
-     properties in a read-only way. This function avoids allocation when there are
-     no document properties changed yet.
-   - The node list returned by DOMNode::getElementsByTagName() and
-	   DOMNode::getElementsByTagNameNS() now caches the length and the last requested item.
-	   This means that the length and the last requested item are not recalculated
-	   when the node list is iterated over multiple times.
-	   If you do not use the internal PHP dom APIs to modify the document, you need to
-	   manually invalidate the cache using php_libxml_invalidate_node_list_cache_from_doc().
-	   Furthermore, the following internal APIs were added to handle the cache:
-	     . php_dom_is_cache_tag_stale_from_doc_ptr()
-	     . php_dom_is_cache_tag_stale_from_node()
-	     . php_dom_mark_cache_tag_up_to_date_from_node()
-   - The function dom_get_elements_by_tag_name_ns_raw() has an additional parameter to indicate
-     the base node of the node list. This function also no longer accepts -1 as the index argument.
-   - The function dom_namednode_iter() has additional arguments to avoid recomputing the length of
-     the strings.
-   - The functions dom_parent_node_prepend(), dom_parent_node_append(), dom_parent_node_after(), and
-     dom_parent_node_before() now use an uint32_t argument for the number of nodes instead of int.
-   - There is now a helper function php_dom_get_content_into_zval() to get the contents of a node.
-     This avoids allocation if possible.
-   - The function dom_set_old_ns() has been moved into ext/libxml as php_libxml_set_old_ns() and
-     is now publicly exposed as an API.
-
- g. ext/libxml
-   - Two new functions: php_libxml_invalidate_node_list_cache_from_doc() and
-     php_libxml_invalidate_node_list_cache() were added to invalidate the cache of a node list.
-
 ========================
 4. OpCode changes
 ========================
@@ -162,6 +29,3 @@ PHP 8.3 INTERNALS UPGRADE NOTES
 ========================
 5. SAPI changes
 ========================
-
-* SAPIs that may execute in alternative stacks have to set EG(stack_limit) and
-  EG(stack_base)
diff --git a/Zend/zend_extensions.h b/Zend/zend_extensions.h
index 461358abd2b..1ef2d978196 100644
--- a/Zend/zend_extensions.h
+++ b/Zend/zend_extensions.h
@@ -44,7 +44,7 @@ You can use the following macro to check the extension API version for compatibi
 
 /* The first number is the engine version and the rest is the date (YYYYMMDD).
  * This way engine 2/3 API no. is always greater than engine 1 API no..  */
-#define ZEND_EXTENSION_API_NO	420230831
+#define ZEND_EXTENSION_API_NO	420230901
 
 typedef struct _zend_extension_version_info {
 	int zend_extension_api_no;
diff --git a/Zend/zend_modules.h b/Zend/zend_modules.h
index 09661e6a2b8..8c90e763a12 100644
--- a/Zend/zend_modules.h
+++ b/Zend/zend_modules.h
@@ -31,7 +31,7 @@
 #define ZEND_MODULE_INFO_FUNC_ARGS zend_module_entry *zend_module
 #define ZEND_MODULE_INFO_FUNC_ARGS_PASSTHRU zend_module
 
-#define ZEND_MODULE_API_NO 20230831
+#define ZEND_MODULE_API_NO 20230901
 #ifdef ZTS
 #define USING_ZTS 1
 #else
diff --git a/main/php.h b/main/php.h
index 7237f55796f..79b73b68d1f 100644
--- a/main/php.h
+++ b/main/php.h
@@ -22,7 +22,7 @@
 #include <dmalloc.h>
 #endif
 
-#define PHP_API_VERSION 20230831
+#define PHP_API_VERSION 20230901
 #define PHP_HAVE_STREAMS
 #define YYDEBUG 0
 #define PHP_DEFAULT_CHARSET "UTF-8"
diff --git a/win32/build/confutils.js b/win32/build/confutils.js
index 359c751b7bb..8f8c3d4ca57 100644
--- a/win32/build/confutils.js
+++ b/win32/build/confutils.js
@@ -95,10 +95,10 @@ if (typeof(CWD) == "undefined") {
 if (!MODE_PHPIZE) {
 	/* defaults; we pick up the precise versions from configure.ac */
 	var PHP_VERSION = 8;
-	var PHP_MINOR_VERSION = 3;
+	var PHP_MINOR_VERSION = 4;
 	var PHP_RELEASE_VERSION = 0;
 	var PHP_EXTRA_VERSION = "";
-	var PHP_VERSION_STRING = "8.3.0";
+	var PHP_VERSION_STRING = "8.4.0";
 }
 
 /* Get version numbers and DEFINE as a string */