diff --git a/CHANGELOG.md b/CHANGELOG.md
index 08aa140..e081fdc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,7 @@ v0.6.0 (in development)
 -----------------------
 - Remove library installation instructions from README
 - List all features in the library documentation
-- Increased MSRV to 1.66
+- Increased MSRV to 1.70
 
 v0.5.0 (2023-04-27)
 -------------------
diff --git a/Cargo.lock b/Cargo.lock
index 646a37b..bb7ba68 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -13,9 +13,9 @@ dependencies = [
 
 [[package]]
 name = "anstyle"
-version = "1.0.2"
+version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "15c4c2c83f81532e5845a733998b6971faca23490340a418e9b72a3ec9de12ea"
+checksum = "b84bf0a05bbb2a83e5eb6fa36bb6e87baa08193c35ff52bbf6b38d8af2890e46"
 
 [[package]]
 name = "assert_cmd"
@@ -178,9 +178,9 @@ checksum = "baff4b617f7df3d896f97fe922b64817f6cd9a756bb81d40f8883f2f66dcb401"
 
 [[package]]
 name = "libc"
-version = "0.2.147"
+version = "0.2.148"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
+checksum = "9cdc71e17332e86d2e1d38c1f99edcb6288ee11b815fb1a4b049eaa2114d369b"
 
 [[package]]
 name = "linux-raw-sys"
@@ -236,9 +236,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.66"
+version = "1.0.67"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "18fb31db3f9bddb2ea821cde30a9f70117e3f119938b5ee630b7403aa6e2ead9"
+checksum = "3d433d9f1a3e8c1263d9456598b16fec66f4acc9a74dacffd35c7bb09b3a1328"
 dependencies = [
  "unicode-ident",
 ]
@@ -421,9 +421,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.106"
+version = "1.0.107"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2cc66a619ed80bf7a0f6b17dd063a84b88f6dea1813737cf469aef1d081142c2"
+checksum = "6b420ce6e3d8bd882e9b243c6eed35dbc9a6110c9769e74b584e0d68d1f20c65"
 dependencies = [
  "itoa",
  "ryu",
@@ -432,9 +432,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "2.0.32"
+version = "2.0.37"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "239814284fd6f1a4ffe4ca893952cdd93c224b6a1571c9a9eadd670295c0c9e2"
+checksum = "7303ef2c05cd654186cb250d29049a24840ca25d2747c25c0381c8d9e2f582e8"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -462,9 +462,9 @@ checksum = "3369f5ac52d5eb6ab48c6b4ffdc8efbcad6b89c765749064ba298f2c68a16a76"
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.11"
+version = "1.0.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "301abaae475aa91687eb82514b328ab47a211a533026cb25fc3e519b86adfc3c"
+checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
 
 [[package]]
 name = "wait-timeout"
diff --git a/Cargo.toml b/Cargo.toml
index 3858005..1d5b85a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,7 +2,7 @@
 name = "ghrepo"
 version = "0.6.0-dev"
 edition = "2021"
-rust-version = "1.66"
+rust-version = "1.70"
 description = "Parse & construct GitHub repository URLs & specifiers"
 authors = ["John Thorvald Wodder II <ghrepo@varonathe.org>"]
 repository = "https://github.com/jwodder/ghrepo-rust"
@@ -20,7 +20,7 @@ assert_cmd = "2.0.12"
 rstest = { version = "0.18.2", default-features = false }
 rstest_reuse = "0.6.0"
 serde = { version = "1.0.188", features = ["derive"] }
-serde_json = "1.0.106"
+serde_json = "1.0.107"
 tempfile = "3.8.0"
 which = "4.4.2"
 
diff --git a/README.md b/README.md
index ff4ac7d..9af8f91 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 [![Project Status: Active – The project has reached a stable, usable state and is being actively developed.](https://www.repostatus.org/badges/latest/active.svg)](https://www.repostatus.org/#active)
 [![CI Status](https://github.com/jwodder/ghrepo-rust/actions/workflows/test.yml/badge.svg)](https://github.com/jwodder/ghrepo-rust/actions/workflows/test.yml)
 [![codecov.io](https://codecov.io/gh/jwodder/ghrepo-rust/branch/master/graph/badge.svg)](https://codecov.io/gh/jwodder/ghrepo-rust)
-[![Minimum Supported Rust Version](https://img.shields.io/badge/MSRV-1.66-orange)](https://www.rust-lang.org)
+[![Minimum Supported Rust Version](https://img.shields.io/badge/MSRV-1.70-orange)](https://www.rust-lang.org)
 [![MIT License](https://img.shields.io/github/license/jwodder/ghrepo-rust.svg)](https://opensource.org/licenses/MIT)
 
 [GitHub](https://github.com/jwodder/ghrepo-rust) | [crates.io](https://crates.io/crates/ghrepo) | [Documentation](https://docs.rs/ghrepo) | [Issues](https://github.com/jwodder/ghrepo-rust/issues) | [Changelog](https://github.com/jwodder/ghrepo-rust/blob/master/CHANGELOG.md)