diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 2833fe98..7ef5a287 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -2,6 +2,10 @@ on:
   pull_request:
     branches:
       - main
+
+permissions:
+  contents: read
+
 name: docs
 jobs:
   docs:
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 3ed755f0..d4929b60 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -2,6 +2,10 @@ on:
   pull_request:
     branches:
       - main
+
+permissions:
+  contents: read
+
 name: lint
 jobs:
   lint:
diff --git a/.github/workflows/mypy.yml b/.github/workflows/mypy.yml
index 8363e721..21621fe2 100644
--- a/.github/workflows/mypy.yml
+++ b/.github/workflows/mypy.yml
@@ -2,6 +2,10 @@ on:
   pull_request:
     branches:
       - main
+
+permissions:
+  contents: read
+
 name: mypy
 jobs:
   mypy:
diff --git a/.github/workflows/unittest.yml b/.github/workflows/unittest.yml
index f654277b..f0e4bfe5 100644
--- a/.github/workflows/unittest.yml
+++ b/.github/workflows/unittest.yml
@@ -5,6 +5,9 @@ on:
     branches:
       - main
 
+permissions:
+  contents: read
+
 jobs:
   run-unittests:
     name: unit${{ matrix.option }}-${{ matrix.python }}