diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 337672e..b259741 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, 1.60.0]
+        rust: [stable, beta, 1.64.0]
         exclude:
           - os: macos-latest
             rust: beta
           - os: windows-latest
             rust: beta
           - os: macos-latest
-            rust: 1.60.0
+            rust: 1.64.0
           - os: windows-latest
-            rust: 1.60.0
+            rust: 1.64.0
 
     runs-on: ${{ matrix.os }}
 
diff --git a/README.md b/README.md
index 6594a6d..32fda5f 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ specification.
 * Support for processing multiple orders concurrently
 * Uses hyper with rustls and Tokio for HTTP requests
 * Uses *ring* for ECDSA signing
-* Minimum supported Rust version: 1.51
+* Minimum supported Rust version: 1.64
 
 ## Limitations
 
@@ -31,4 +31,4 @@ specification.
 
 ## Getting started
 
-See the [examples](examples) directory for an example of how to use instant-acme.
\ No newline at end of file
+See the [examples](examples) directory for an example of how to use instant-acme.