diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index d43ac832..c61a8e21 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -31,7 +31,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
     - uses: actions/checkout@v5
-    - uses: dtolnay/rust-toolchain@stable
+    - uses: dtolnay/rust-toolchain@nightly
     - uses: Swatinem/rust-cache@v2
       with:
         save-if: ${{ github.ref == 'refs/heads/main' }}