diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index a6b0c68..926d527 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -145,7 +145,7 @@ jobs:
       - name: Install Rust
         uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: stable
+          toolchain: nightly
           components: rustfmt
       - name: Check formatting
         run: cargo fmt --all --check