1<!-- 2Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 3 4SPDX-License-Identifier: curl 5--> 6 7# Items to be removed from future curl releases 8 9If any of these deprecated features is a cause for concern for you, please 10email the 11[curl-library mailing list](https://lists.haxx.se/listinfo/curl-library) 12as soon as possible and explain to us why this is a problem for you and 13how your use case cannot be satisfied properly using a workaround. 14 15## TLS libraries without 1.3 support 16 17curl drops support for TLS libraries without TLS 1.3 capability after May 182025. 19 20It requires that a curl build using the library should be able to negotiate 21and use TLS 1.3, or else it is not good enough. 22 23As of May 2024, the libraries that need to get fixed to remain supported after 24May 2025 are: BearSSL and Secure Transport. 25 26## msh3 support 27 28The msh3 backed for QUIC and HTTP/3 was introduced in April 2022 but has never 29been made to work properly. It has seen no visible traction or developer 30activity from the msh3 main author (or anyone else seemingly interested) in 31two years. As a non-functional backend, it only adds friction and "weight" to 32the development and maintenance. 33 34Meanwhile, we have a fully working backend in the ngtcp2 one and we have two 35fully working backends in OpenSSL-QUIC and quiche well on their way of ending 36their experimental status in a future. 37 38We remove msh3 support from the curl source tree in July 2025. 39 40## winbuild build system 41 42curl drops support for the winbuild build method after September 2025. 43 44We recommend migrating to CMake. See the migration guide in 45`docs/INSTALL-CMAKE.md`. 46 47## Past removals 48 49 - Pipelining 50 - axTLS 51 - PolarSSL 52 - NPN 53 - Support for systems without 64-bit data types 54 - NSS 55 - gskit 56 - MinGW v1 57 - NTLM_WB 58 - space-separated `NOPROXY` patterns 59 - hyper 60