diff --git a/.github/workflows/gen-client.yml b/.github/workflows/gen-client.yml
index 582343e..45a216b 100644
--- a/.github/workflows/gen-client.yml
+++ b/.github/workflows/gen-client.yml
@@ -2,6 +2,9 @@ name: Generate API Client
 on:
   workflow_dispatch:
 
+permissions:
+  contents: read
+
 jobs:
   gen-api:
     timeout-minutes: 30
diff --git a/.github/workflows/lint_golang.yml b/.github/workflows/lint_golang.yml
index e624a24..b99efbe 100644
--- a/.github/workflows/lint_golang.yml
+++ b/.github/workflows/lint_golang.yml
@@ -7,6 +7,9 @@ on:
     branches:
       - main
 
+permissions:
+  contents: read
+
 jobs:
   golangci:
     name: Lint with GolangCI
diff --git a/.github/workflows/release-pr.yml b/.github/workflows/release-pr.yml
index db3a020..ac37325 100644
--- a/.github/workflows/release-pr.yml
+++ b/.github/workflows/release-pr.yml
@@ -3,7 +3,9 @@ on:
   push:
     branches:
       - main
-  workflow_dispatch:
+
+permissions:
+  contents: read
 
 jobs:
   release-please:
diff --git a/.github/workflows/unittest.yml b/.github/workflows/unittest.yml
index 29ba9ee..512b74f 100644
--- a/.github/workflows/unittest.yml
+++ b/.github/workflows/unittest.yml
@@ -7,6 +7,9 @@ on:
     branches:
       - main
 
+permissions:
+  contents: read
+
 jobs:
   unitests:
     timeout-minutes: 30