diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 036920f..337672e 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -12,16 +12,16 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        rust: [stable, beta, 1.56.1]
+        rust: [stable, beta, 1.60.0]
         exclude:
           - os: macos-latest
             rust: beta
           - os: windows-latest
             rust: beta
           - os: macos-latest
-            rust: 1.56.1
+            rust: 1.60.0
           - os: windows-latest
-            rust: 1.56.1
+            rust: 1.60.0
 
     runs-on: ${{ matrix.os }}
 
diff --git a/Cargo.toml b/Cargo.toml
index 8e1a870..0db0927 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "instant-acme"
 version = "0.1.1"
-edition = "2018"
+edition = "2021"
 license = "Apache-2.0"
 description = "Async pure-Rust ACME client"
 homepage = "https://github.com/InstantDomain/instant-acme"
@@ -9,6 +9,7 @@ repository = "https://github.com/InstantDomain/instant-acme"
 documentation = "https://docs.rs/instant-acme"
 keywords = ["letsencrypt", "acme"]
 categories = ["web-programming", "api-bindings"]
+rust-version = "1.60.0"
 
 [dependencies]
 base64 = "0.13.0"