From 111de5a18bcc88bf1863ba5c9d8da5f10fc2df1c Mon Sep 17 00:00:00 2001
From: "Tobin C. Harding" <me@tobin.cc>
Date: Wed, 27 Mar 2024 06:35:04 +1100
Subject: [PATCH] Bump MSRV to 1.56.1

We want to depend on the newly released version of `hashes` which has an
MSRV of 1.56.1

`hashes` is an optional dependency so we either bump the MSRV here or
document that enabling `hashes` increases the MSRV.

Also bumps MSRV of `secp256k1-sys` to keep the whole repository on the
same MSRV although this is not strictly necessary we would have to patch
CI to test secp-sys with 1.48 if we do not bump its MSRV also.
---
 .github/workflows/rust.yml | 4 ++--
 Cargo.toml                 | 3 ++-
 README.md                  | 2 +-
 secp256k1-sys/Cargo.toml   | 3 ++-
 secp256k1-sys/README.md    | 2 +-
 5 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 9297ba0c0..f8f768151 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -55,7 +55,7 @@ jobs:
         run: ./contrib/test.sh
 
   MSRV:
-    name: Test - 1.48.0 toolchain
+    name: Test - 1.56.1 toolchain
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
@@ -63,7 +63,7 @@ jobs:
       - name: Checkout Crate
         uses: actions/checkout@v3
       - name: Checkout Toolchain
-        uses: dtolnay/rust-toolchain@1.48.0
+        uses: dtolnay/rust-toolchain@1.56.1
       - name: Running test script
         env:
           DO_FEATURE_MATRIX: true
diff --git a/Cargo.toml b/Cargo.toml
index 942835bb7..b6e1dcf72 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,7 +10,8 @@ documentation = "https://docs.rs/secp256k1/"
 description = "Rust wrapper library for Pieter Wuille's `libsecp256k1`. Implements ECDSA and BIP 340 signatures for the SECG elliptic curve group secp256k1 and related utilities."
 keywords = [ "crypto", "ECDSA", "secp256k1", "libsecp256k1", "bitcoin" ]
 readme = "README.md"
-edition = "2018"
+edition = "2021"
+rust-version = "1.56.1"
 
 [package.metadata.docs.rs]
 all-features = true
diff --git a/README.md b/README.md
index ca4efa31b..10ead79a1 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,7 @@ Contributions to this library are welcome. A few guidelines:
 * Any breaking changes must have an accompanied entry in CHANGELOG.md
 * No new dependencies, please.
 * No crypto should be implemented in Rust, with the possible exception of hash functions. Cryptographic contributions should be directed upstream to libsecp256k1.
-* This library should always compile with any combination of features on **Rust 1.48.0**.
+* This library should always compile with any combination of features on **Rust 1.56.1**.
 
 ### Githooks
 
diff --git a/secp256k1-sys/Cargo.toml b/secp256k1-sys/Cargo.toml
index f565c5bd9..2ca55b53d 100644
--- a/secp256k1-sys/Cargo.toml
+++ b/secp256k1-sys/Cargo.toml
@@ -13,7 +13,8 @@ keywords = [ "secp256k1", "libsecp256k1", "ffi" ]
 readme = "README.md"
 build = "build.rs"
 links = "rustsecp256k1_v0_9_2"
-edition = "2018"
+edition = "2021"
+rust-version = "1.56.1"
 
 [package.metadata.docs.rs]
 all-features = true
diff --git a/secp256k1-sys/README.md b/secp256k1-sys/README.md
index 3305e2d37..5129aa0f7 100644
--- a/secp256k1-sys/README.md
+++ b/secp256k1-sys/README.md
@@ -49,4 +49,4 @@ to your `RUSTFLAGS` variable.
 
 ## Minimum Supported Rust Version
 
-This library should always compile with any combination of features on **Rust 1.48.0**.
+This library should always compile with any combination of features on **Rust 1.56.1**.