diff --git a/.github/workflows/push_complement_image.yml b/.github/workflows/push_complement_image.yml
index 34f86520b0..d989aa6cca 100644
--- a/.github/workflows/push_complement_image.yml
+++ b/.github/workflows/push_complement_image.yml
@@ -17,6 +17,9 @@ on:
           - develop
           - master
 
+permissions:
+  contents: read
+
 # Only run this action once per pull request/branch; restart if a new commit arrives.
 # C.f. https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions#concurrency
 # and https://docs.github.com/en/actions/reference/context-and-expression-syntax-for-github-actions#github-context