diff --git a/.github/workflows/tests_and_checks.yml b/.github/workflows/tests_and_checks.yml
index 206b6c3..34209f7 100644
--- a/.github/workflows/tests_and_checks.yml
+++ b/.github/workflows/tests_and_checks.yml
@@ -45,7 +45,7 @@ jobs:
         with:
           args: --all -- --check
           command: fmt
-          toolchain: stable
+          toolchain: unstable
 
       - name: Run Linter
         uses: actions-rs/cargo@v1