diff --git a/.github/workflows/buildx.yml b/.github/workflows/buildx.yml
index cc21077..19d541c 100644
--- a/.github/workflows/buildx.yml
+++ b/.github/workflows/buildx.yml
@@ -8,6 +8,9 @@ on:
       - master
   pull_request:
 
+permissions:
+  contents: read
+
 jobs:
   buildx:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/dockerimage.yml b/.github/workflows/dockerimage.yml
index b71099a..ee807e3 100644
--- a/.github/workflows/dockerimage.yml
+++ b/.github/workflows/dockerimage.yml
@@ -7,6 +7,9 @@ on:
   pull_request:
   workflow_dispatch:
 
+permissions:
+  contents: read
+
 jobs:
   build:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/hadolint.yml b/.github/workflows/hadolint.yml
index bfa6b76..6b682b3 100644
--- a/.github/workflows/hadolint.yml
+++ b/.github/workflows/hadolint.yml
@@ -6,6 +6,9 @@ on:
       - master
   pull_request:
 
+permissions:
+  contents: read
+
 jobs:
   build:
     runs-on: macos-latest