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ImageOptim · Dec 18, 2023 · 9ed7838 · 9ed7838
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diff --git a/README.md b/README.md
@@ -38,7 +38,7 @@ Libimagequant is dual-licensed:
 
 ## Upgrading instructions
 
-libimagequant v2 used to be a C library. libimagequant v4 is written entirely in Rust, but still exports the same C interface for C programs. You will need to install Rust 1.60+ to build it, and adjust your build commands. If you do not want to upgrade, you can keep using [the C version of the library](https://github.com/imageoptim/libimagequant/tree/2.x) in the `2.x` branch of the [repo](https://github.com/ImageOptim/libimagequant).
+libimagequant v2 used to be a C library. libimagequant v4 is written entirely in Rust, but still exports the same C interface for C programs. You will need to install Rust 1.70+ to build it, and adjust your build commands. If you do not want to upgrade, you can keep using [the C version of the library](https://github.com/imageoptim/libimagequant/tree/2.x) in the `2.x` branch of the [repo](https://github.com/ImageOptim/libimagequant).
 
 ### C static library users
 
@@ -82,7 +82,7 @@ cargo install cargo-c
 cargo cinstall --prefix=/usr/local --destdir=.
 ```
 
-This makes Rust 1.60 and `cargo-c` package a build-time dependency. No runtime deps (apart from Cargo-internal ones). OpenMP has been dropped entirely.
+This makes Rust 1.70 and `cargo-c` package a build-time dependency. No runtime deps (apart from Cargo-internal ones). OpenMP has been dropped entirely.
 
 #### Interaction with pngquant
 

diff --git a/imagequant-sys/README.md b/imagequant-sys/README.md
@@ -27,7 +27,7 @@ imagequant = "4.0"
 
 ### Building for C
 
-1. Get Rust 1.60 or later via [rustup](https://rustup.rs) and run `rustup update`.
+1. Get Rust 1.70 or later via [rustup](https://rustup.rs) and run `rustup update`.
 2. `cd imagequant-sys`
 
    The C API is exposed by a separate package called [`imagequant-sys`](https://github.com/ImageOptim/libimagequant/tree/main/imagequant-sys).