diff --git a/ChangeLog.d/improve_x509_cert_writing_serial_number_management.txt b/ChangeLog.d/improve_x509_cert_writing_serial_number_management.txt
new file mode 100644
index 000000000..64d1b279a
--- /dev/null
+++ b/ChangeLog.d/improve_x509_cert_writing_serial_number_management.txt
@@ -0,0 +1,10 @@
+Bugfix
+   * mbedtls_x509write_crt_set_serial() now explicitly rejects serial numbers
+     whose binary representation is longer than 20 bytes. This was already
+     forbidden by the standard (RFC5280 - section 4.1.2.2) and now it's being
+     enforced also at code level.
+
+New deprecations
+   * mbedtls_x509write_crt_set_serial() is now being deprecated in favor of
+     mbedtls_x509write_crt_set_serial_new(). The goal here is to remove any
+     direct dependency of X509 from BIGNUM_C.