diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index bb08b2ff62d511..3576eff6e352ba 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -22,6 +22,9 @@ on:
     - '3.8'
     - '3.7'
 
+permissions:
+  contents: read
+
 jobs:
   check_source:
     name: 'Check for source changes'
diff --git a/.github/workflows/build_msi.yml b/.github/workflows/build_msi.yml
index ec18735e9b9fa6..6044ae0f7c29b4 100644
--- a/.github/workflows/build_msi.yml
+++ b/.github/workflows/build_msi.yml
@@ -23,6 +23,9 @@ on:
     paths:
     - 'Tools/msi/**'
 
+permissions:
+  contents: read
+
 jobs:
   build_win32:
     name: 'Windows (x86) Installer'
diff --git a/.github/workflows/doc.yml b/.github/workflows/doc.yml
index 73a6a50520e02d..e06f21671b5a5a 100644
--- a/.github/workflows/doc.yml
+++ b/.github/workflows/doc.yml
@@ -25,6 +25,9 @@ on:
     - 'Misc/**'
     - '.github/workflows/doc.yml'
 
+permissions:
+  contents: read
+
 jobs:
   build_doc:
     name: 'Docs'
diff --git a/.github/workflows/new-bugs-announce-notifier.yml b/.github/workflows/new-bugs-announce-notifier.yml
index 8cd834419f00bf..b2b63472d83421 100644
--- a/.github/workflows/new-bugs-announce-notifier.yml
+++ b/.github/workflows/new-bugs-announce-notifier.yml
@@ -5,6 +5,9 @@ on:
     types:
       - opened
 
+permissions:
+  issues: read
+
 jobs:
   notify-new-bugs-announce:
     runs-on: ubuntu-latest
@@ -39,7 +42,7 @@ jobs:
                 assignee : issue.data.assignees.map(assignee => { return assignee.login }),
                 body   : issue.data.body
               };
-            
+
               const data = {
                 from: "CPython Issues <github@mg.python.org>",
                 to: "new-bugs-announce@python.org",