diff --git a/.github/workflows/ci-lint-deps/action.yml b/.github/workflows/ci-lint-deps/action.yml
index 2519f1033..9c9495613 100644
--- a/.github/workflows/ci-lint-deps/action.yml
+++ b/.github/workflows/ci-lint-deps/action.yml
@@ -3,11 +3,13 @@ runs:
   using: "composite"
   steps:
     - name: Install Rust (nightly)
-      uses: dtolnay/rust-toolchain@nightly
+      uses: dtolnay/rust-toolchain@master
+      with:
+        toolchain: nightly-2025-01-02
     - name: Lint deps
       shell: bash
       run: |
         cargo install cargo-machete --locked
         cargo machete
         cargo install cargo-udeps --locked
-        cargo +nightly udeps
+        cargo +nightly-2025-01-02 udeps
diff --git a/.github/workflows/ci-test-miri/action.yml b/.github/workflows/ci-test-miri/action.yml
index 1898b2e74..f821d8191 100644
--- a/.github/workflows/ci-test-miri/action.yml
+++ b/.github/workflows/ci-test-miri/action.yml
@@ -3,12 +3,14 @@ runs:
   using: "composite"
   steps:
     - name: Install Rust (nightly)
-      uses: dtolnay/rust-toolchain@nightly
+      uses: dtolnay/rust-toolchain@master
+      with:
+        toolchain: nightly-2025-01-02
     - name: Cargo test (miri)
       shell: bash
       run: |
         # Install and run miri tests
         cargo clean
-        rustup component add --toolchain nightly miri
+        rustup component add --toolchain nightly-2025-01-02 miri
         # This somehow prints errors in CI that don't show up locally
-        RUSTFLAGS=-Awarnings cargo +nightly miri test -p deno_core
+        RUSTFLAGS=-Awarnings cargo +nightly-2025-01-02 miri test -p deno_core