diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8c1743be..66dbe040 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -21,7 +21,7 @@ jobs:
     strategy:
       matrix:                   # All permutations of {rust, mcu}
         rust:
-          - 1.65.0  # MSRV
+          - 1.66.1  # MSRV
           - stable
         mcu:
           - stm32h743
diff --git a/CHANGELOG.md b/CHANGELOG.md
index b5bd57bc..30893f4a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## [Unreleased]
 
+* MSRV increased to Rust 1.66.1 [#473]
+
 ## [v0.15.1] 2023-11-03
 
 * Bugfix, usb: On RM0455 and RM0468 parts, PA11/PA12 do not have an alternate function
diff --git a/Cargo.toml b/Cargo.toml
index 6e568d36..8b04bee5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,7 +11,7 @@ authors = ["Andrew Straw <strawman@astraw.com>",
            "Florian Jung <flo@windfisch.org>",
            "Matt Ickstadt <mattico8@gmail.com>"]
 edition = "2021"
-rust-version = "1.65"
+rust-version = "1.66.1"
 categories = ["embedded", "hardware-support", "no-std"]
 description = "Hardware Abstraction Layer implementation for STM32H7 series microcontrollers"
 keywords = ["arm", "cortex-m", "stm32h7xx", "hal", "embedded-hal"]
diff --git a/README.md b/README.md
index 9b42e16a..a7474095 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ stm32h7xx-hal
 [![docs.rs](https://docs.rs/stm32h7xx-hal/badge.svg)](https://docs.rs/stm32h7xx-hal)
 [![CI](https://github.com/stm32-rs/stm32h7xx-hal/workflows/Continuous%20integration/badge.svg)](https://github.com/stm32-rs/stm32h7xx-hal/actions)
 [![Crates.io](https://img.shields.io/crates/v/stm32h7xx-hal.svg)](https://crates.io/crates/stm32h7xx-hal)
-![Minimum rustc version](https://img.shields.io/badge/rustc-1.65.0+-yellow.svg)
+![Minimum rustc version](https://img.shields.io/badge/rustc-1.66.1+-yellow.svg)
 
 [_stm32h7xx-hal_](https://github.com/stm32-rs/stm32h7xx-hal) contains
 a hardware abstraction layer on top of the peripheral access API for
@@ -110,7 +110,7 @@ programming interfaces are only available on the high density connectors.
 Minimum supported Rust version
 ------------------------------
 
-The Minimum Supported Rust Version (MSRV) at the moment is **1.65.0**. Older
+The Minimum Supported Rust Version (MSRV) at the moment is **1.66.1**. Older
 versions **may** compile, especially when some features are not used in your
 application.