diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a2eff19..be95e32 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,7 +23,8 @@ jobs:
     - name: Setup Rust toolchain and cache
       uses: actions-rust-lang/setup-rust-toolchain@v1
       with:
-        toolchain: 1.83
+        # use nightly to support custom formatting features
+        toolchain: nightly
         components: rustfmt,clippy
 
     - name: cargo fmt