diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b1fdc80..a97528c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,9 +16,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         toolchain:
-          - stable
-          - beta
-          - nightly
+          - 1.85.0
     steps:
       - uses: actions/checkout@v4
       - run: rustup update ${{ matrix.toolchain }} && rustup default ${{ matrix.toolchain }}