diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 257e442..ee98c6c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -29,7 +29,9 @@ jobs:
     timeout-minutes: 20
     steps:
       - uses: actions/checkout@v3
-      - uses: dtolnay/rust-toolchain@stable
+      - uses: dtolnay/rust-toolchain@nightly
+        with:
+          components: fmt
       - run: cargo fmt --check
 
   examples: