diff --git a/.github/workflows/main_using_main.yml b/.github/workflows/main_using_main.yml
index 963a6728c..dbf27c0f4 100644
--- a/.github/workflows/main_using_main.yml
+++ b/.github/workflows/main_using_main.yml
@@ -1,5 +1,8 @@
 name: main branch, main toolchain
 
+permissions:
+  contents: read
+
 on:
   push:
     branches:
diff --git a/.github/workflows/main_using_release.yml b/.github/workflows/main_using_release.yml
index 151e94874..b861be1f8 100644
--- a/.github/workflows/main_using_release.yml
+++ b/.github/workflows/main_using_release.yml
@@ -1,5 +1,8 @@
 name: main branch, 6.2 toolchain
 
+permissions:
+  contents: read
+
 on:
   push:
     branches:
diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index 19725c9da..084fd1d87 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -1,5 +1,8 @@
 name: Pull request
 
+permissions:
+  contents: read
+
 on:
   pull_request:
     types: [opened, reopened, synchronize]