diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 577d6bed..56d79bb3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -82,7 +82,7 @@ jobs:
       uses: actions-rs/toolchain@v1
       with:
         profile: minimal
-        toolchain: 1.46.0
+        toolchain: 1.56.0
         override: true
 
     - name: Version features
diff --git a/Cargo.toml b/Cargo.toml
index 307312df..51cd62a3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,7 +13,7 @@ categories = [
 ]
 description = "A library to generate and parse UUIDs."
 documentation = "https://docs.rs/uuid"
-edition = "2018"
+edition = "2021"
 exclude = [
     ".github/**",
     ".travis.yml",
@@ -100,7 +100,16 @@ optional = true
 version = "1"
 
 # Private
-[dependencies.sha1-rust-crypto]
+# NOTE: On Windows (MSVC) we can't use the `asm` feature yet
+# See: https://github.com/RustCrypto/asm-hashes/issues/17
+[target.'cfg(windows)'.dependencies.sha1-rust-crypto]
+package = "sha1"
+default-features = false
+optional = true
+version = "0.10"
+
+# Private
+[target.'cfg(not(windows))'.dependencies.sha1-rust-crypto]
 package = "sha1"
 default-features = false
 features = ["asm"]
diff --git a/README.md b/README.md
index 2d7746a1..f4b7f54c 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # `uuid`
 
 [![Latest Version](https://img.shields.io/crates/v/uuid.svg)](https://crates.io/crates/uuid)
-![Minimum rustc version](https://img.shields.io/badge/rustc-1.46.0+-yellow.svg)
+![Minimum rustc version](https://img.shields.io/badge/rustc-1.56.0+-yellow.svg)
 [![Continuous integration](https://github.com/uuid-rs/uuid/actions/workflows/ci.yml/badge.svg)](https://github.com/uuid-rs/uuid/actions/workflows/ci.yml)
 
 Here's an example of a UUID: