Bump MSRV to 1.60

.gitlab-ci.yml

@@ -64,10 +64,10 @@ check-nightly:
   <<: *check-base
   variables:
     RUST_VERSION: nightly
-check-old:
+check-msrv:
   <<: *check-base
   variables:
-    RUST_VERSION: "1.56.1"
+    RUST_VERSION: "1.60.0"
 
 # Build using Rust stable
 build-x86_64-linux-gnu:

README.md

@@ -444,7 +444,7 @@ before proceeding:
 ### Build requirements
 - Runtime [requirements](#requirements)
 - [`git`][git]
-- [`rust`][rust] `v1.40` or higher (install using [`rustup`][rustup])
+- [`rust`][rust] `v1.60` (MSRV) or higher (install using [`rustup`][rustup])
 - [OpenSSL][openssl] or [LibreSSL][libressl] libraries/headers:
   - Linux:
     - Ubuntu, Debian and derivatives: `apt install build-essential cmake pkg-config libssl-dev`