diff --git a/.github/workflows/msrv.yaml b/.github/workflows/msrv.yaml
index d811c71..7e7adcc 100644
--- a/.github/workflows/msrv.yaml
+++ b/.github/workflows/msrv.yaml
@@ -35,7 +35,7 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
-    - uses: dtolnay/rust-toolchain@stable
+    - uses: dtolnay/rust-toolchain@1.56.1
       with:
         targets: ${{ matrix.target }}
     - uses: taiki-e/install-action@v2