diff --git a/.github/workflows/rustfmt.yml b/.github/workflows/rustfmt.yml
index 6e3ddf4d3..b79c5ca97 100644
--- a/.github/workflows/rustfmt.yml
+++ b/.github/workflows/rustfmt.yml
@@ -22,5 +22,6 @@ jobs:
     - name: Check formatting
       uses: actions-rs/cargo@v1
       with:
+        toolchain: nightly
         command: fmt
         args: -- --check