diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4f91503..d72f84e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v5
-      - uses: dtolnay/rust-toolchain@stable
+      - uses: dtolnay/rust-toolchain@1.99.0
         with:
           components: rustfmt
       - run: cargo fmt --all --check
@@ -25,7 +25,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v5
-      - uses: dtolnay/rust-toolchain@stable
+      - uses: dtolnay/rust-toolchain@1.99.0
         with:
           components: clippy
           targets: wasm32-unknown-unknown
@@ -39,7 +39,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v5
-      - uses: dtolnay/rust-toolchain@stable
+      - uses: dtolnay/rust-toolchain@1.99.0
         with:
           targets: wasm32-unknown-unknown
       - uses: Swatinem/rust-cache@v2