diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2bc0781..7ea3f7c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,12 +5,16 @@ on:
     branches: [main]
   pull_request:
 
+# Least privilege: jobs only read the repo. Elevate per job if one ever needs more.
+permissions:
+  contents: read
+
 jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
+      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
         with:
           node-version: 20
           cache: npm