diff --git a/ChangeLog b/ChangeLog
index 1c48958..7de639e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,330 @@
 Mbed TLS ChangeLog (Sorted per branch, date)
 
+= Mbed TLS 4.0.0-beta branch released 2025-07-04
+
+API changes
+   * The experimental functions psa_generate_key_ext() and
+     psa_key_derivation_output_key_ext() have been replaced by
+     psa_generate_key_custom() and psa_key_derivation_output_key_custom().
+     They have almost exactly the same interface, but the variable-length
+     data is passed in a separate parameter instead of a flexible array
+     member. This resolves a build failure under C++ compilers that do not
+     support flexible array members (a C99 feature not adopted by C++).
+     Fixes #9020.
+   * Align the mbedtls_ssl_ticket_setup() function with the PSA Crypto API.
+     Instead of taking a mbedtls_cipher_type_t as an argument, this function
+     now takes 3 new arguments: a PSA algorithm, key type and key size, to
+     specify the AEAD for ticket protection.
+   * The PSA and Mbed TLS error spaces are now unified. mbedtls_xxx()
+     functions can now return PSA_ERROR_xxx values.
+     There is no longer a distinction between "low-level" and "high-level"
+     Mbed TLS error codes.
+     This will not affect most applications since the error values are
+     between -32767 and -1 as before.
+   * All API functions now use the PSA random generator psa_get_random()
+     internally. As a consequence, functions no longer take RNG parameters.
+     Please refer to the migration guide at :
+     tf-psa-crypto/docs/4.0-migration-guide.md.
+
+Default behavior changes
+   * In a PSA-client-only build (i.e. MBEDTLS_PSA_CRYPTO_CLIENT &&
+     !MBEDTLS_PSA_CRYPTO_C), do not automatically enable local crypto when the
+     corresponding PSA mechanism is enabled, since the server provides the
+     crypto. Fixes #9126.
+   * The PK, X.509, PKCS7 and TLS modules now always use the PSA subsystem
+     to perform cryptographic operations, with a few exceptions documented
+     in docs/architecture/psa-migration/psa-limitations.md. This
+     corresponds to the behavior of Mbed TLS 3.x when
+     MBEDTLS_USE_PSA_CRYPTO is enabled. In effect, MBEDTLS_USE_PSA_CRYPTO
+     is now always enabled.
+   * psa_crypto_init() must be called before performing any cryptographic
+     operation, including indirect requests such as parsing a key or
+     certificate or starting a TLS handshake.
+   * The `PSA_WANT_XXX` symbols as defined in
+     tf-psa-crypto/include/psa/crypto_config.h are now always used in the
+     configuration of the cryptographic mechanisms exposed by the PSA API.
+     This corresponds to the configuration behavior of Mbed TLS 3.x when
+     MBEDTLS_PSA_CRYPTO_CONFIG is enabled. In effect, MBEDTLS_PSA_CRYPTO_CONFIG
+     is now always enabled and the configuration option has been removed.
+   * In TLS clients, if mbedtls_ssl_set_hostname() has not been called,
+     mbedtls_ssl_handshake() now fails with
+     MBEDTLS_ERR_SSL_CERTIFICATE_VERIFICATION_WITHOUT_HOSTNAME
+     if certificate-based authentication of the server is attempted.
+     This is because authenticating a server without knowing what name
+     to expect is usually insecure.
+
+Removals
+   * Drop support for VIA Padlock. Removes MBEDTLS_PADLOCK_C.
+     Fixes #5903.
+   * Drop support for crypto alt interface. Removes MBEDTLS_XXX_ALT options
+     at the module and function level for crypto mechanisms only. The remaining
+     alt interfaces for platform, threading and timing are unchanged.
+     Fixes #8149.
+   * Remove support for the RSA-PSK key exchange in TLS 1.2.
+   * Remove deprecated mbedtls_x509write_crt_set_serial(). The function was
+     already deprecated and superseeded by
+     mbedtls_x509write_crt_set_serial_raw().
+   * Remove the function mbedtls_ssl_conf_curves() which had been deprecated
+     in favour of mbedtls_ssl_conf_groups() since Mbed TLS 3.1.
+   * Remove support for the DHE-PSK key exchange in TLS 1.2.
+   * Remove support for the DHE-RSA key exchange in TLS 1.2.
+   * Following the removal of DHM module (#9972 and TF-PSA-Crypto#175) the
+     following SSL functions are removed:
+     - mbedtls_ssl_conf_dh_param_bin
+     - mbedtls_ssl_conf_dh_param_ctx
+     - mbedtls_ssl_conf_dhm_min_bitlen
+   * Remove support for the RSA key exchange in TLS 1.2.
+   * Remove mbedtls_low_level_sterr() and mbedtls_high_level_strerr(),
+     since these concepts no longer exists. There is just mbedtls_strerror().
+    * Removal of the following sample programs:
+          pkey/rsa_genkey.c
+          pkey/pk_decrypt.c
+          pkey/dh_genprime.c
+          pkey/rsa_verify.c
+          pkey/mpi_demo.c
+          pkey/rsa_decrypt.c
+          pkey/key_app.c
+          pkey/dh_server.c
+          pkey/ecdh_curve25519.c
+          pkey/pk_encrypt.c
+          pkey/rsa_sign.c
+          pkey/key_app_writer.c
+          pkey/dh_client.c
+          pkey/ecdsa.c
+          pkey/rsa_encrypt.c
+          wince_main.c
+          aes/crypt_and_hash.c
+          random/gen_random_ctr_drbg.c
+          random/gen_entropy.c
+          hash/md_hmac_demo.c
+          hash/hello.c
+          hash/generic_sum.c
+          cipher/cipher_aead_demo.c
+   * Remove compat-2-x.h header from mbedtls.
+   * The library no longer offers interfaces to look up values by OID
+     or OID by enum values.
+     The header <mbedtls/oid.h> now only defines functions to convert
+     between binary and dotted string OID representations, and macros
+     for OID strings that are relevant to X.509.
+     The compilation option MBEDTLS_OID_C no longer
+     exists. OID tables are included in the build automatically as needed.
+
+Features
+   * When the new compilation option MBEDTLS_PSA_KEY_STORE_DYNAMIC is enabled,
+     the number of volatile PSA keys is virtually unlimited, at the expense
+     of increased code size. This option is off by default, but enabled in
+     the default mbedtls_config.h. Fixes #9216.
+   * Add a new psa_key_agreement() PSA API to perform key agreement and return
+     an identifier for the newly created key.
+   * Added new configuration option MBEDTLS_PSA_STATIC_KEY_SLOTS, which
+     uses static storage for keys, enabling malloc-less use of key slots.
+     The size of each buffer is given by the option
+     MBEDTLS_PSA_STATIC_KEY_SLOT_BUFFER_SIZE. By default it accommodates the
+     largest PSA key enabled in the build.
+   * Add an interruptible version of key agreement to the PSA interface.
+     See psa_key_agreement_iop_setup() and related functions.
+   * Add an interruptible version of generate key to the PSA interface.
+     See psa_generate_key_iop_setup() and related functions.
+   * Add the function mbedtls_ssl_export_keying_material() which allows the
+     client and server to extract additional shared symmetric keys from an SSL
+     session, according to the TLS-Exporter specification in RFC 8446 and 5705.
+     This requires MBEDTLS_SSL_KEYING_MATERIAL_EXPORT to be defined in
+     mbedtls_config.h.
+
+Security
+   * Unlike previously documented, enabling MBEDTLS_PSA_HMAC_DRBG_MD_TYPE does
+     not cause the PSA subsystem to use HMAC_DRBG: it uses HMAC_DRBG only when
+     MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG and MBEDTLS_CTR_DRBG_C are disabled.
+     CVE-2024-45157
+   * Fix a stack buffer overflow in mbedtls_ecdsa_der_to_raw() and
+     mbedtls_ecdsa_raw_to_der() when the bits parameter is larger than the
+     largest supported curve. In some configurations with PSA disabled,
+     all values of bits are affected. This never happens in internal library
+     calls, but can affect applications that call these functions directly.
+     CVE-2024-45158
+   * With TLS 1.3, when a server enables optional authentication of the
+     client, if the client-provided certificate does not have appropriate values
+     in keyUsage or extKeyUsage extensions, then the return value of
+     mbedtls_ssl_get_verify_result() would incorrectly have the
+     MBEDTLS_X509_BADCERT_KEY_USAGE and MBEDTLS_X509_BADCERT_EXT_KEY_USAGE bits
+     clear. As a result, an attacker that had a certificate valid for uses other
+     than TLS client authentication could be able to use it for TLS client
+     authentication anyway. Only TLS 1.3 servers were affected, and only with
+     optional authentication (required would abort the handshake with a fatal
+     alert).
+     CVE-2024-45159
+   * Fix a buffer underrun in mbedtls_pk_write_key_der() when
+     called on an opaque key, MBEDTLS_USE_PSA_CRYPTO is enabled,
+     and the output buffer is smaller than the actual output.
+     Fix a related buffer underrun in mbedtls_pk_write_key_pem()
+     when called on an opaque RSA key, MBEDTLS_USE_PSA_CRYPTO is enabled
+     and MBEDTLS_MPI_MAX_SIZE is smaller than needed for a 4096-bit RSA key.
+     CVE-2024-49195
+   * Note that TLS clients should generally call mbedtls_ssl_set_hostname()
+     if they use certificate authentication (i.e. not pre-shared keys).
+     Otherwise, in many scenarios, the server could be impersonated.
+     The library will now prevent the handshake and return
+     MBEDTLS_ERR_SSL_CERTIFICATE_VERIFICATION_WITHOUT_HOSTNAME
+     if mbedtls_ssl_set_hostname() has not been called.
+     Reported by Daniel Stenberg.
+     CVE-2025-27809
+   * Fix a vulnerability in the TLS 1.2 handshake. If memory allocation failed
+     or there was a cryptographic hardware failure when calculating the
+     Finished message, it could be calculated incorrectly. This would break
+     the security guarantees of the TLS handshake.
+     CVE-2025-27810
+   * Fix possible use-after-free or double-free in code calling
+     mbedtls_x509_string_to_names(). This was caused by the function calling
+     mbedtls_asn1_free_named_data_list() on its head argument, while the
+     documentation did no suggest it did, making it likely for callers relying
+     on the documented behaviour to still hold pointers to memory blocks after
+     they were free()d, resulting in high risk of use-after-free or double-free,
+     with consequences ranging up to arbitrary code execution.
+     In particular, the two sample programs x509/cert_write and x509/cert_req
+     were affected (use-after-free if the san string contains more than one DN).
+     Code that does not call mbedtls_string_to_names() directly is not affected.
+     Found by Linh Le and Ngan Nguyen from Calif.
+     CVE-2025-47917
+   * Fix a bug in mbedtls_x509_string_to_names() and the
+     mbedtls_x509write_{crt,csr}_set_{subject,issuer}_name() functions,
+     where some inputs would cause an inconsistent state to be reached, causing
+     a NULL dereference either in the function itself, or in subsequent
+     users of the output structure, such as mbedtls_x509_write_names(). This
+     only affects applications that create (as opposed to consume) X.509
+     certificates, CSRs or CRLs. Found by Linh Le and Ngan Nguyen from Calif.
+     CVE-2025-48965
+
+Bugfix
+   * Fix TLS 1.3 client build and runtime when support for session tickets is
+     disabled (MBEDTLS_SSL_SESSION_TICKETS configuration option). Fixes #6395.
+   * Fix compilation error when memcpy() is a function-like macros. Fixes #8994.
+   * MBEDTLS_ASN1_PARSE_C and MBEDTLS_ASN1_WRITE_C are now automatically enabled
+     as soon as MBEDTLS_RSA_C is enabled. Fixes #9041.
+   * Fix undefined behaviour (incrementing a NULL pointer by zero length) when
+     passing in zero length additional data to multipart AEAD.
+   * Fix rare concurrent access bug where attempting to operate on a
+     non-existent key while concurrently creating a new key could potentially
+     corrupt the key store.
+   * Fix error handling when creating a key in a dynamic secure element
+     (feature enabled by MBEDTLS_PSA_CRYPTO_SE_C). In a low memory condition,
+     the creation could return PSA_SUCCESS but using or destroying the key
+     would not work. Fixes #8537.
+   * Fix issue of redefinition warning messages for _GNU_SOURCE in
+     entropy_poll.c and sha_256.c. There was a build warning during
+     building for linux platform.
+     Resolves #9026
+   * Fix a compilation warning in pk.c when PSA is enabled and RSA is disabled.
+   * Fix the build when MBEDTLS_PSA_CRYPTO_CONFIG is enabled and the built-in
+     CMAC is enabled, but no built-in unauthenticated cipher is enabled.
+     Fixes #9209.
+   * Fix redefinition warnings when SECP192R1 and/or SECP192K1 are disabled.
+     Fixes #9029.
+   * Fix psa_cipher_decrypt() with CCM* rejecting messages less than 3 bytes
+     long. Credit to Cryptofuzz. Fixes #9314.
+   * Fix interference between PSA volatile keys and built-in keys
+     when MBEDTLS_PSA_CRYPTO_BUILTIN_KEYS is enabled and
+     MBEDTLS_PSA_KEY_SLOT_COUNT is more than 4096.
+   * Document and enforce the limitation of mbedtls_psa_register_se_key()
+     to persistent keys. Resolves #9253.
+   * Fix Clang compilation error when MBEDTLS_USE_PSA_CRYPTO is enabled
+     but MBEDTLS_DHM_C is disabled. Reported by Michael Schuster in #9188.
+   * Fix server mode only build when MBEDTLS_SSL_SRV_C is enabled but
+     MBEDTLS_SSL_CLI_C is disabled. Reported by M-Bab on GitHub in #9186.
+   * When MBEDTLS_PSA_CRYPTO_C was disabled and MBEDTLS_ECDSA_C enabled,
+     some code was defining 0-size arrays, resulting in compilation errors.
+     Fixed by disabling the offending code in configurations without PSA
+     Crypto, where it never worked. Fixes #9311.
+   * Fixes an issue where some TLS 1.2 clients could not connect to an
+     Mbed TLS 3.6.0 server, due to incorrect handling of
+     legacy_compression_methods in the ClientHello.
+     fixes #8995, #9243.
+   * Fix a memory leak that could occur when failing to process an RSA
+     key through some PSA functions due to low memory conditions.
+   * Fixed a regression introduced in 3.6.0 where the CA callback set with
+     mbedtls_ssl_conf_ca_cb() would stop working when connections were
+     upgraded to TLS 1.3. Fixed by adding support for the CA callback with TLS
+     1.3.
+   * Fixed a regression introduced in 3.6.0 where clients that relied on
+     optional/none authentication mode, by calling mbedtls_ssl_conf_authmode()
+     with MBEDTLS_SSL_VERIFY_OPTIONAL or MBEDTLS_SSL_VERIFY_NONE, would stop
+     working when connections were upgraded to TLS 1.3. Fixed by adding
+     support for optional/none with TLS 1.3 as well. Note that the TLS 1.3
+     standard makes server authentication mandatory; users are advised not to
+     use authmode none, and to carefully check the results when using optional
+     mode.
+   * Fixed a regression introduced in 3.6.0 where context-specific certificate
+     verify callbacks, set with mbedtls_ssl_set_verify() as opposed to
+     mbedtls_ssl_conf_verify(), would stop working when connections were
+     upgraded to TLS 1.3. Fixed by adding support for context-specific verify
+     callback in TLS 1.3.
+   * Fix unintended performance regression when using short RSA public keys.
+     Fixes #9232.
+   * When MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE is disabled, work with
+     peers that have middlebox compatibility enabled, as long as no
+     problematic middlebox is in the way. Fixes #9551.
+   * Fix invalid JSON schemas for driver descriptions used by
+     generate_driver_wrappers.py.
+   * Use 'mbedtls_net_close' instead of 'close' in 'mbedtls_net_bind'
+     and 'mbedtls_net_connect' to prevent possible double close fd
+     problems. Fixes #9711.
+   * Fix undefined behavior in some cases when mbedtls_psa_raw_to_der() or
+     mbedtls_psa_der_to_raw() is called with bits=0.
+   * Fix compilation on MS-DOS DJGPP. Fixes #9813.
+   * Fix missing constraints on the AES-NI inline assembly which is used on
+     GCC-like compilers when building AES for generic x86_64 targets. This
+     may have resulted in incorrect code with some compilers, depending on
+     optimizations. Fixes #9819.
+   * Support re-assembly of fragmented handshake messages in TLS (both
+     1.2 and 1.3). The lack of support was causing handshake failures with
+     some servers, especially with TLS 1.3 in practice. There are a few
+     limitations, notably a fragmented ClientHello is only supported when
+     TLS 1.3 support is enabled. See the documentation of
+     mbedtls_ssl_handshake() for details.
+   * Fix definition of MBEDTLS_PRINTF_SIZET to prevent runtime crashes that
+     occurred whenever SSL debugging was enabled on a copy of Mbed TLS built
+     with Visual Studio 2013 or MinGW.
+     Fixes #10017.
+   * Silence spurious -Wunterminated-string-initialization warnings introduced
+     by GCC 15. Fixes #9944.
+
+Changes
+   * Warn if mbedtls/check_config.h is included manually, as this can
+     lead to spurious errors. Error if a *adjust*.h header is included
+     manually, as this can lead to silently inconsistent configurations,
+     potentially resulting in buffer overflows.
+     When migrating from Mbed TLS 2.x, if you had a custom config.h that
+     included check_config.h, remove this inclusion from the Mbed TLS 3.x
+     configuration file (renamed to mbedtls_config.h). This change was made
+     in Mbed TLS 3.0, but was not announced in a changelog entry at the time.
+   * Functions regarding numeric string conversions for OIDs have been moved
+     from the OID module and now reside in X.509 module. This helps to reduce
+     the code size as these functions are not commonly used outside of X.509.
+   * Improve performance of PSA key generation with ECC keys: it no longer
+     computes the public key (which was immediately discarded). Fixes #9732.
+   * Cryptography and platform configuration options have been migrated
+     from the Mbed TLS library configuration file mbedtls_config.h to
+     crypto_config.h that will become the TF-PSA-Crypto configuration file,
+     see config-split.md for more information. The reference and test custom
+     configuration files respectively in configs/ and tests/configs/ have
+     been updated accordingly.
+     To migrate custom Mbed TLS configurations where
+     MBEDTLS_PSA_CRYPTO_CONFIG is disabled, you should first adapt them
+     to the PSA configuration scheme based on PSA_WANT_XXX symbols
+     (see psa-conditional-inclusion-c.md for more information).
+     To migrate custom Mbed TLS configurations where
+     MBEDTLS_PSA_CRYPTO_CONFIG is enabled, you should migrate the
+     cryptographic and platform configuration options from mbedtls_config.h
+     to crypto_config.h (see config-split.md for more information and configs/
+     for examples).
+   * Move the crypto part of the library (content of tf-psa-crypto directory)
+     from the Mbed TLS to the TF-PSA-Crypto repository. The crypto code and
+     tests development will now occur in TF-PSA-Crypto, which Mbed TLS
+     references as a Git submodule.
+   * The function mbedtls_x509_string_to_names() now requires its head argument
+     to point to NULL on entry. This makes it likely that existing risky uses of
+     this function (see the entry in the Security section) will be detected and
+     fixed.
+
 = Mbed TLS 3.6.0 branch released 2024-03-28
 
 API changes