diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index d6a1b9ca..bfd2da2f 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -29,7 +29,7 @@ jobs:
           - build: msrv
             os: ubuntu-20.04
             # sync MSRV with docs: guide/src/guide/installation.md and Cargo.toml
-            rust: 1.66.0
+            rust: 1.70.0
     steps:
     - uses: actions/checkout@v3
     - name: Install Rust
diff --git a/Cargo.toml b/Cargo.toml
index 385aa470..c0b17041 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,7 +14,7 @@ license = "MPL-2.0"
 readme = "README.md"
 repository = "https://github.com/rust-lang/mdBook"
 description = "Creates a book from markdown files"
-rust-version = "1.66"
+rust-version = "1.70"
 
 [dependencies]
 anyhow = "1.0.71"
diff --git a/guide/src/guide/installation.md b/guide/src/guide/installation.md
index cd1e2d60..a25cfd82 100644
--- a/guide/src/guide/installation.md
+++ b/guide/src/guide/installation.md
@@ -20,7 +20,7 @@ To make it easier to run, put the path to the binary into your `PATH`.
 
 To build the `mdbook` executable from source, you will first need to install Rust and Cargo.
 Follow the instructions on the [Rust installation page].
-mdBook currently requires at least Rust version 1.66.
+mdBook currently requires at least Rust version 1.70.
 
 Once you have installed Rust, the following command can be used to build and install mdBook: