diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index b534363e9..54bb0008e 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -60,12 +60,12 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest]
-        toolchain: [1.73.0, 1.66.0]
+        toolchain: [1.73.0, 1.70.0]
         include:
           - os: windows-latest
             toolchain: 1.73.0-x86_64-pc-windows-gnu
           - os: windows-latest
-            toolchain: 1.66.0-x86_64-pc-windows-gnu
+            toolchain: 1.70.0-x86_64-pc-windows-gnu
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v3
diff --git a/Cargo.lock b/Cargo.lock
index 667c8b850..6b590c505 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -34,16 +34,15 @@ checksum = "ca77caf0ca1057c274cda103cda1363d892b7cad5f2e646afde4df0697bea100"
 
 [[package]]
 name = "anstream"
-version = "0.3.2"
+version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0ca84f3628370c59db74ee214b3263d58f9aadd9b4fe7e711fd87dc452b7f163"
+checksum = "2ab91ebe16eb252986481c5b62f6098f3b698a45e34b5b98200cf20dd2484a44"
 dependencies = [
  "anstyle",
  "anstyle-parse",
  "anstyle-query",
  "anstyle-wincon",
  "colorchoice",
- "is-terminal",
  "utf8parse",
 ]
 
@@ -73,9 +72,9 @@ dependencies = [
 
 [[package]]
 name = "anstyle-wincon"
-version = "1.0.2"
+version = "3.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c677ab05e09154296dd37acecd46420c17b9713e8366facafa8fc0885167cf4c"
+checksum = "f0699d10d2f4d628a98ee7b57b289abbc98ff3bad977cb3152709d4bf2330628"
 dependencies = [
  "anstyle",
  "windows-sys",
@@ -184,33 +183,31 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "clap"
-version = "4.3.24"
+version = "4.4.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fb690e81c7840c0d7aade59f242ea3b41b9bc27bcd5997890e7702ae4b32e487"
+checksum = "ac495e00dcec98c83465d5ad66c5c4fabd652fd6686e7c6269b117e729a6f17b"
 dependencies = [
  "clap_builder",
  "clap_derive",
- "once_cell",
 ]
 
 [[package]]
 name = "clap_builder"
-version = "4.3.24"
+version = "4.4.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5ed2e96bc16d8d740f6f48d663eddf4b8a0983e79210fd55479b7bcd0a69860e"
+checksum = "c77ed9a32a62e6ca27175d00d29d05ca32e396ea1eb5fb01d8256b669cec7663"
 dependencies = [
  "anstream",
  "anstyle",
  "clap_lex",
- "once_cell",
  "strsim",
 ]
 
 [[package]]
 name = "clap_derive"
-version = "4.3.12"
+version = "4.4.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "54a9bb5758fc5dfe728d1019941681eccaf0cf8a4189b692a0ee2f2ecf90a050"
+checksum = "cf9804afaaf59a91e75b022a30fb7229a7901f60c755489cc61c9b423b836442"
 dependencies = [
  "heck",
  "proc-macro2",
@@ -220,9 +217,9 @@ dependencies = [
 
 [[package]]
 name = "clap_lex"
-version = "0.5.1"
+version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cd7cc57abe963c6d3b9d8be5b06ba7c8957a930305ca90304f24ef040aa6f961"
+checksum = "702fc72eb24e5a1e48ce58027a675bc24edd52096d5397d4aea7c6dd9eca0bd1"
 
 [[package]]
 name = "colorchoice"
@@ -450,7 +447,6 @@ dependencies = [
  "hex",
  "hex-literal",
  "indexmap",
- "is-terminal",
  "itertools",
  "libc",
  "libz-sys",
@@ -511,12 +507,6 @@ version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "95505c38b4572b2d910cecb0281560f54b440a19336cbbcb27bf6ce6adc6f5a8"
 
-[[package]]
-name = "hermit-abi"
-version = "0.3.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d77f7ec81a6d05a3abb01ab6eb7590f6083d08449fe5a1c8b1e620283546ccb7"
-
 [[package]]
 name = "hex"
 version = "0.4.3"
@@ -549,17 +539,6 @@ dependencies = [
  "hashbrown",
 ]
 
-[[package]]
-name = "is-terminal"
-version = "0.4.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cb0889898416213fab133e1d33a0e5858a48177452750691bde3666d0fdbaf8b"
-dependencies = [
- "hermit-abi",
- "rustix",
- "windows-sys",
-]
-
 [[package]]
 name = "itertools"
 version = "0.11.0"
diff --git a/Cargo.toml b/Cargo.toml
index b1a7a28c7..4993aa512 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,7 +10,7 @@ authors = ["Mike Hommey <mh@glandium.org>"]
 edition = "2021"
 license = "MPL-2.0 AND GPL-2.0"
 repository = "https://github.com/glandium/git-cinnabar"
-rust-version = "1.66.0"
+rust-version = "1.70.0"
 include = [
   "/src",
   "/build.rs",
@@ -44,7 +44,6 @@ git-version = "0.3"
 hex = "0.4"
 hex-literal = "0.4"
 indexmap = "2"
-is-terminal = "0.4"
 itertools = "0.11"
 libc = "0.2"
 once_cell = "1.13"
@@ -62,7 +61,7 @@ default-features = false
 features = ["std"]
 
 [dependencies.clap]
-version = "4.0,<4.4"  # Avoid MSRV bump to 1.70.
+version = "4.0"
 features = ["cargo", "derive"]
 
 [target.'cfg(windows)'.dependencies.curl-sys]
diff --git a/README.md b/README.md
index ce208a2db..2c6ebe2e1 100644
--- a/README.md
+++ b/README.md
@@ -38,7 +38,7 @@ Requirements:
 
 - Git (any version should work ; cinnabarclone bundles require 1.4.4).
 - In order to build from source:
-  - Rust 1.66.0 or newer.
+  - Rust 1.70.0 or newer.
   - GCC or clang.
 
 Setup:
diff --git a/src/main.rs b/src/main.rs
index c9572a598..995dbd4db 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -86,7 +86,7 @@ use std::ffi::CString;
 use std::ffi::{CStr, OsStr, OsString};
 use std::fs::File;
 use std::hash::Hash;
-use std::io::{stdin, stdout, BufRead, BufWriter, Write};
+use std::io::{stdin, stdout, BufRead, BufWriter, IsTerminal, Write};
 use std::iter::repeat;
 use std::os::raw::{c_char, c_int, c_void};
 #[cfg(windows)]
@@ -106,7 +106,6 @@ use cinnabar::{
 use cstr::cstr;
 use git::{BlobId, CommitId, GitObjectId};
 use git_version::git_version;
-use is_terminal::IsTerminal;
 
 use graft::{graft_finish, grafted, init_graft};
 use hg::{HgChangesetId, HgFileId, HgManifestId, ManifestEntry};