diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 530403d7b6..e11645955f 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -28,11 +28,12 @@ jobs:
         uses: actions/checkout@v3
       - uses: actions-rs/toolchain@v1
         with:
-          toolchain: nightly
+          toolchain: nightly-2023-05-08
           components: rustfmt
+          override: true
       - name: "Verify code formatting"
         run: |
-          cargo +nightly fmt --check
+          cargo +nightly-2023-05-08 fmt --check
 
   workflow-setup:
     runs-on: ubuntu-20.04