diff --git a/.github/workflows/configs-build.yml b/.github/workflows/configs-build.yml
index ee84145e9..1f73306f2 100644
--- a/.github/workflows/configs-build.yml
+++ b/.github/workflows/configs-build.yml
@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [ main ]
 
+permissions:
+  contents: read
+
 jobs:
   build:
     runs-on: ubuntu-18.04
diff --git a/.github/workflows/coverity-scan.yml b/.github/workflows/coverity-scan.yml
index 1561e8f76..0343a9441 100644
--- a/.github/workflows/coverity-scan.yml
+++ b/.github/workflows/coverity-scan.yml
@@ -4,6 +4,9 @@ on:
   schedule:
     - cron: '0 10 * * *' # Daily at 10:00 UTC
 
+permissions:
+  contents: read
+
 jobs:
   latest:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/linux-ci.yml b/.github/workflows/linux-ci.yml
index 012d5125c..e77fee6d9 100644
--- a/.github/workflows/linux-ci.yml
+++ b/.github/workflows/linux-ci.yml
@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [ main ]
 
+permissions:
+  contents: read
+
 jobs:
   build:
     runs-on: ubuntu-18.04
diff --git a/.github/workflows/macos-ci.yml b/.github/workflows/macos-ci.yml
index 96853d71e..e19924e78 100644
--- a/.github/workflows/macos-ci.yml
+++ b/.github/workflows/macos-ci.yml
@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [ main ]
 
+permissions:
+  contents: read
+
 jobs:
   build:
     runs-on: macos-10.15
diff --git a/.github/workflows/msvc-ci.yml b/.github/workflows/msvc-ci.yml
index 77ffed056..b513154bc 100644
--- a/.github/workflows/msvc-ci.yml
+++ b/.github/workflows/msvc-ci.yml
@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [ main ]
 
+permissions:
+  contents: read
+
 jobs:
   msvc:
     runs-on: ${{ matrix.os }}
diff --git a/.github/workflows/msys2-ci.yml b/.github/workflows/msys2-ci.yml
index b8b2fc390..5cdc1e0f1 100644
--- a/.github/workflows/msys2-ci.yml
+++ b/.github/workflows/msys2-ci.yml
@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [ main ]
 
+permissions:
+  contents: read
+
 jobs:
   msys2:
     runs-on: windows-latest