diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 91235584..2a559b76 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -20,6 +20,9 @@ env:
   COLUMNS: 120
   FORCE_COLOR: 3
 
+permissions:
+  contents: read
+
 jobs:
   check-pr-changes:
     name: Check PR changes for deploy workflow
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 91c6bfbf..d818ade2 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -7,6 +7,9 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+
 jobs:
   lint:
     runs-on: ubuntu-26.04
diff --git a/.github/workflows/nix.yml b/.github/workflows/nix.yml
index a3bde20f..d2419da1 100644
--- a/.github/workflows/nix.yml
+++ b/.github/workflows/nix.yml
@@ -22,6 +22,9 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+
 jobs:
   flake:
     name: Flake on ${{ matrix.runner }} (Python ${{ matrix.python }})
diff --git a/.github/workflows/qa-analysis.yml b/.github/workflows/qa-analysis.yml
index ec968771..c2b258ba 100644
--- a/.github/workflows/qa-analysis.yml
+++ b/.github/workflows/qa-analysis.yml
@@ -17,6 +17,9 @@ env:
   COLUMNS: 120
   CPM_USE_LOCAL_PACKAGES: "TRUE"
 
+permissions:
+  contents: read
+
 jobs:
   cpp-changes:
     name: Detect C++ file changes
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 0d1fde70..bd71052d 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -17,6 +17,9 @@ env:
   COLUMNS: 120
   CPM_USE_LOCAL_PACKAGES: "TRUE"
 
+permissions:
+  contents: read
+
 jobs:
   package-tests:
     name: Test [mpi:${{ matrix.mpi }}] ${{ matrix.runner }} py${{ matrix.python-version }} ${{ matrix.compiler }}