diff --git a/.github/workflows/check-links-periodic.yaml b/.github/workflows/check-links-periodic.yaml
index 524b453..426e64e 100644
--- a/.github/workflows/check-links-periodic.yaml
+++ b/.github/workflows/check-links-periodic.yaml
@@ -10,6 +10,9 @@ on:
   schedule:
     - cron: "0 0,12 * * *"
 
+permissions:
+  contents: read
+
 jobs:
   markdown-link-check:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/check-links-pr.yaml b/.github/workflows/check-links-pr.yaml
index f467cdd..418eed7 100644
--- a/.github/workflows/check-links-pr.yaml
+++ b/.github/workflows/check-links-pr.yaml
@@ -1,5 +1,9 @@
 on: [pull_request]
 name: Check Markdown links in modified files
+
+permissions:
+  contents: read
+
 jobs:
   markdown-link-check:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index ec1f46d..0637e6b 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -5,6 +5,9 @@ on:
     branches: [main]
   pull_request:
 
+permissions:
+  contents: read
+
 jobs:
   pytest:
     runs-on: ubuntu-latest