diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index c91a7195..6e8c2f34 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -9,12 +9,15 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
+env:
+  RUST_TOOLCHAIN: nightly-2024-01-17
+
 jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - run: curl --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain nightly
+      - run: curl --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain "$RUST_TOOLCHAIN"
       - uses: actions/setup-python@v5
         with:
           python-version: '3.11'
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index d1279b41..a73cf728 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -13,6 +13,9 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
+env:
+  RUST_TOOLCHAIN: nightly-2024-01-17
+
 jobs:
   build-linux-x86_64:
     name: Build Linux x86_64 wheel
@@ -29,7 +32,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
-      - run: curl --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal --default-toolchain nightly
+      - run: curl --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal --default-toolchain "$RUST_TOOLCHAIN"
       - run: echo "$HOME/.cargo/bin" >> "$GITHUB_PATH"
       - run: /opt/python/${{ matrix.python-path }}/bin/python -m venv .venv
       - run: .venv/bin/pip install -U pip wheel maturin
@@ -51,7 +54,7 @@ jobs:
         python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
     steps:
       - uses: actions/checkout@v4
-      - run: curl --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal --default-toolchain nightly
+      - run: curl --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal --default-toolchain ${{ env.RUST_TOOLCHAIN }}
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
@@ -75,7 +78,7 @@ jobs:
     runs-on: macos-latest
     steps:
       - uses: actions/checkout@v4
-      - run: curl --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal --default-toolchain nightly
+      - run: curl --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal --default-toolchain "$RUST_TOOLCHAIN"
       - run: rustup component add rust-src
       - name: Set up Python
         uses: actions/setup-python@v5
@@ -106,7 +109,7 @@ jobs:
     runs-on: macos-latest
     steps:
       - uses: actions/checkout@v4
-      - run: curl --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal --default-toolchain nightly
+      - run: curl --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal --default-toolchain "$RUST_TOOLCHAIN"
       - run: rustup target add aarch64-apple-darwin
       - name: Set up Python
         uses: actions/setup-python@v5
@@ -131,7 +134,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - run: curl --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal --default-toolchain nightly
+      - run: curl --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal --default-toolchain "$RUST_TOOLCHAIN"
       - name: Set up Python
         uses: actions/setup-python@v5
         with: