diff --git a/.github/workflows/linux-ci.yml b/.github/workflows/linux-ci.yml
index 4103114..47c076d 100644
--- a/.github/workflows/linux-ci.yml
+++ b/.github/workflows/linux-ci.yml
@@ -4,6 +4,9 @@ on:
   push:
     branches: [__main__]
 
+permissions:
+  contents: read
+
 jobs:
   build:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/macos-ci.yml b/.github/workflows/macos-ci.yml
index 54354f4..25eb434 100644
--- a/.github/workflows/macos-ci.yml
+++ b/.github/workflows/macos-ci.yml
@@ -4,6 +4,9 @@ on:
   push:
     branches: [__main__]
 
+permissions:
+  contents: read
+
 jobs:
   build:
     runs-on: macos-latest
diff --git a/.github/workflows/msvc-ci.yml b/.github/workflows/msvc-ci.yml
index 699d97b..8fa4393 100644
--- a/.github/workflows/msvc-ci.yml
+++ b/.github/workflows/msvc-ci.yml
@@ -6,6 +6,10 @@ on:
     branches: [ __main__ ]
   workflow_dispatch:
 
+permissions:
+  contents: read
+  packages: read
+
 jobs:
   build:
     runs-on: windows-latest