diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 318ebdb..6b0ace6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [main]
 
+permissions:
+  contents: read
+
 env:
   CARGO_TERM_COLOR: always
   RUSTFLAGS: "-Dwarnings"
@@ -26,7 +29,7 @@ jobs:
             rust: "1.75"
     steps:
       - uses: actions/checkout@v6
-      - uses: dtolnay/rust-toolchain@master
+      - uses: dtolnay/rust-toolchain@stable
         with:
           toolchain: ${{ matrix.rust }}
       - uses: Swatinem/rust-cache@v2