diff --git a/.github/workflows/daily-snapshots.yml b/.github/workflows/daily-snapshots.yml
index 37ba4bc3ba..3d6f85ea4f 100644
--- a/.github/workflows/daily-snapshots.yml
+++ b/.github/workflows/daily-snapshots.yml
@@ -9,6 +9,9 @@ on:
   schedule:
     - cron: '0 0 * * *'
 
+permissions:
+  contents: read
+
 jobs:
   generate-snapshots:
     name: Generate ${{ matrix.version }} snapshots
diff --git a/.github/workflows/lint-and-analyse-php.yml b/.github/workflows/lint-and-analyse-php.yml
index 6506101d08..a43b539a94 100644
--- a/.github/workflows/lint-and-analyse-php.yml
+++ b/.github/workflows/lint-and-analyse-php.yml
@@ -8,6 +8,9 @@ on:
       - master
       - QA_**
 
+permissions:
+  contents: read
+
 jobs:
   lint-node:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/lock.yml b/.github/workflows/lock.yml
index cf13839196..b4ec30d4d7 100644
--- a/.github/workflows/lock.yml
+++ b/.github/workflows/lock.yml
@@ -4,8 +4,13 @@ on:
   schedule:
     - cron: '0 0 * * *'
 
+permissions:
+  contents: read
+
 jobs:
   lock:
+    permissions:
+      issues: write  # for dessant/lock-threads to lock issues
     runs-on: ubuntu-latest
     steps:
       - uses: dessant/lock-threads@v2
diff --git a/.github/workflows/mutation-tests.yml b/.github/workflows/mutation-tests.yml
index 49d6931f06..17d0da682d 100644
--- a/.github/workflows/mutation-tests.yml
+++ b/.github/workflows/mutation-tests.yml
@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [master]
 
+permissions:
+  contents: read
+
 jobs:
   tests:
     name: Mutation tests with PHP ${{ matrix.php-version }}
diff --git a/.github/workflows/other-tools.yml b/.github/workflows/other-tools.yml
index d83c38803c..493fd35990 100644
--- a/.github/workflows/other-tools.yml
+++ b/.github/workflows/other-tools.yml
@@ -8,6 +8,9 @@ on:
       - master
       - QA_**
 
+permissions:
+  contents: read
+
 jobs:
   build-documentation:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/test-selenium.yml b/.github/workflows/test-selenium.yml
index a9b93c8248..aa29db1236 100644
--- a/.github/workflows/test-selenium.yml
+++ b/.github/workflows/test-selenium.yml
@@ -11,6 +11,9 @@ on:
 env:
   php-version: "8.1"
 
+permissions:
+  contents: read
+
 jobs:
   selenium:
     name: "Selenium"
diff --git a/.github/workflows/update-po.yml b/.github/workflows/update-po.yml
index ac07c2592c..a505e41e01 100644
--- a/.github/workflows/update-po.yml
+++ b/.github/workflows/update-po.yml
@@ -5,8 +5,13 @@ on:
   schedule:
     - cron: '0 0 * * 0'
 
+permissions:
+  contents: read
+
 jobs:
   update-po:
+    permissions:
+      contents: write  # for Git to git push
     name: Update po files
     runs-on: ubuntu-latest
     # Source: https://github.community/t/do-not-run-cron-workflows-in-forks/17636/2?u=williamdes