diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index 3b6f3e3..900a3d7 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -4,6 +4,9 @@ on:
   pull_request:
     types: [opened, reopened, synchronize]
 
+permissions:
+  contents: read
+
 jobs:
   soundness:
     name: Soundness
diff --git a/.github/workflows/pull_request_label.yml b/.github/workflows/pull_request_label.yml
index 8fd47c1..1fe3c14 100644
--- a/.github/workflows/pull_request_label.yml
+++ b/.github/workflows/pull_request_label.yml
@@ -4,6 +4,9 @@ on:
   pull_request:
     types: [labeled, unlabeled, opened, reopened, synchronize]
 
+permissions:
+  contents: read
+
 jobs:
   semver-label-check:
     name: Semantic version label check