diff --git a/.github/workflows/test-on-pr.yml b/.github/workflows/test-on-pr.yml
index eb82101..1a8f2b1 100644
--- a/.github/workflows/test-on-pr.yml
+++ b/.github/workflows/test-on-pr.yml
@@ -19,7 +19,7 @@ jobs:
       - name: install Rust stable
         uses: dtolnay/rust-toolchain@stable
         with:
-          toolchain: 1.85.1
+          toolchain: 1.97.1
       - name: install dependencies (ubuntu only)
         if: matrix.platform == 'ubuntu-22.04'
         run: |