From 8175e4a166b603a22003bf361fcea50aaf6c0e19 Mon Sep 17 00:00:00 2001
From: Trevor Gross <tg@trevorgross.com>
Date: Fri, 13 Feb 2026 06:36:59 +0000
Subject: [PATCH] Increase the MSRV from 1.63 to 1.65

Perform a small MSRV bump by two versions. The main thing this gets is
access to the C types in `core::ffi`, which means the ecosystem can
start harmonizing around those aliases instead of using e.g.
`core::ffi::c_int` in some cases and `libc::c_int` in others.

1.65 is selected as a small bump over 1.64 because it comes with some
small "nice" things like workspace-level lints and `cast_mut`. It has
been over a year since the last MSRV bump to 1.63 (in 93052d1542de,
"Document the MSRV of the stable channel as 1.63") so we could probably
bump higher yet, but there isn't anything else on the list at [1] as
useful as `core::ffi`.

[1]: https://github.com/rust-lang/libc/issues/4626
---
 .github/workflows/ci.yaml | 6 +++---
 Cargo.toml                | 2 +-
 README.md                 | 2 +-
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 02c0a7a7592f7..0abaeb0b6968c 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -52,7 +52,7 @@ jobs:
     name: Verify build
     strategy:
       matrix:
-        toolchain: [stable, 1.63.0]
+        toolchain: [stable, 1.65.0]
         include:
           # Nightly has a lot of targets, so split it in half
           - toolchain: nightly
@@ -62,7 +62,7 @@ jobs:
           - toolchain: beta
             only: '(aarch64|x86_64)' # just a spot check for beta
           - toolchain: stable
-          - toolchain: 1.63.0 # msrv
+          - toolchain: 1.65.0 # msrv
     runs-on: ubuntu-24.04
     timeout-minutes: 25
     env:
@@ -93,7 +93,7 @@ jobs:
         run: |
           set -eux
           # Remove `-Dwarnings` at the MSRV since lints may be different
-          [ "${{ matrix.toolchain }}" = "1.63.0" ] && export RUSTFLAGS=""
+          [ "${{ matrix.toolchain }}" = "1.65.0" ] && export RUSTFLAGS=""
           python3 ci/verify-build.py \
             --toolchain "$TOOLCHAIN" \
             ${BASELINE_CRATE_DIR:+"--baseline-crate-dir" "$BASELINE_CRATE_DIR"} \
diff --git a/Cargo.toml b/Cargo.toml
index a1c7fffbef8ed..9a17b54e10680 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,7 +9,7 @@ authors = ["The Rust Project Developers"]
 edition = "2021"
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/rust-lang/libc"
-rust-version = "1.63"
+rust-version = "1.65"
 
 [package.metadata.docs.rs]
 features = ["extra_traits"]
diff --git a/README.md b/README.md
index 607bf308d01eb..69aff2cae166d 100644
--- a/README.md
+++ b/README.md
@@ -57,7 +57,7 @@ The following features are deprecated:
 
 ## Rust version support
 
-The minimum supported Rust toolchain version is currently **Rust 1.63**.
+The minimum supported Rust toolchain version is currently **Rust 1.65**.
 
 Increases to the MSRV are allowed to change without a major (i.e. semver-
 breaking) release in order to avoid a ripple effect in the ecosystem. A policy