diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 66a1c2c53..c58dc6baa 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -12,7 +12,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
         with:
-          toolchain: stable
+          toolchain: 1.56.0
           override: true
       - uses: katyo/publish-crates@v1
         with:
@@ -37,6 +37,12 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v3
+
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: 1.56.0
+          override: true
+
       - uses: taiki-e/upload-rust-binary-action@v1
         with:
           bin: difft