diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 839c39b..909bc8c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,7 +28,7 @@ jobs:
       - name: Install Rust
         uses: dtolnay/rust-toolchain@e97e2d8cc328f1b50210efc529dca0028893a2d9 # v1
         with:
-          toolchain: nightly
+          toolchain: nightly-2025-10-23
 
       - name: Cache Rust dependencies
         uses: Swatinem/rust-cache@f13886b937689c021905a6b90929199931d60db1 # v2.8.1