diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0f31865..900e867 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -53,6 +53,8 @@ jobs:
       - uses: actions/checkout@v4
       - uses: extractions/setup-just@v3
       - uses: dtolnay/rust-toolchain@nightly
+        with:
+          components: rust-src
       - run: just docs-zynq
 
   clippy:
diff --git a/justfile b/justfile
index 218abe8..f6fd08f 100644
--- a/justfile
+++ b/justfile
@@ -19,7 +19,7 @@ clean target:
   cd {{target}} && cargo clean
 
 fmt target:
-  cd {{target}} && cargo fmt --all -- --check
+  cd {{target}} && cargo +stable fmt --all -- --check
 
 clippy target:
   cd {{target}} && cargo clippy -- -D warnings