diff --git a/.github/workflows/idefix-ci-doc.yml b/.github/workflows/idefix-ci-doc.yml
index 036404654..7422be2f3 100644
--- a/.github/workflows/idefix-ci-doc.yml
+++ b/.github/workflows/idefix-ci-doc.yml
@@ -9,13 +9,16 @@ on:
     paths-ignore:
       - '.github/ISSUE_TEMPLATE/*'
 
+permissions: {}
 
 jobs:
   ReadTheDocs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+        with:
+          persist-credentials: false
       - name: install doxygen
         run: sudo apt-get install -y doxygen
       - name: install python dependencies
diff --git a/.github/workflows/idefix-ci-jobs.yml b/.github/workflows/idefix-ci-jobs.yml
index 275ea1ce2..32eef5911 100644
--- a/.github/workflows/idefix-ci-jobs.yml
+++ b/.github/workflows/idefix-ci-jobs.yml
@@ -21,14 +21,17 @@ env:
   PYTHONPATH: ${{ github.workspace }}
   IDEFIX_DIR: ${{ github.workspace }}
 
+permissions: {}
+
 jobs:
   ShocksHydro:
     runs-on: self-hosted
     steps:
       - name: Check out repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
         with:
           submodules: recursive
+          persist-credentials: false
       - name: Sod test
         run: scripts/ci/run-tests $IDEFIX_DIR/test/HD/sod -all $TESTME_OPTIONS
       - name: Isothermal Sod test
@@ -40,9 +43,10 @@ jobs:
     runs-on: self-hosted
     steps:
       - name: Check out repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
         with:
           submodules: recursive
+          persist-credentials: false
       - name: Viscous flow past cylinder
         run: scripts/ci/run-tests $IDEFIX_DIR/test/HD/ViscousFlowPastCylinder -all $TESTME_OPTIONS
       - name: Viscous disk
@@ -54,9 +58,10 @@ jobs:
     runs-on: self-hosted
     steps:
       - name: Check out repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
         with:
           submodules: recursive
+          persist-credentials: false
       - name: MHD Sod test
         run: scripts/ci/run-tests $IDEFIX_DIR/test/MHD/sod -all $TESTME_OPTIONS
       - name: MHD Isothermal Sod test
@@ -72,9 +77,10 @@ jobs:
     runs-on: self-hosted
     steps:
       - name: Check out repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
         with:
           submodules: recursive
+          persist-credentials: false
       - name: Ambipolar C Shock
         run: scripts/ci/run-tests $IDEFIX_DIR/test/MHD/AmbipolarCshock -all $TESTME_OPTIONS
       - name: Ambipolar C Shock 3D
@@ -91,9 +97,10 @@ jobs:
     runs-on: self-hosted
     steps:
       - name: Check out repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
         with:
           submodules: recursive
+          persist-credentials: false
       - name: Fargo + planet
         run: scripts/ci/run-tests $IDEFIX_DIR/test/HD/FargoPlanet -all $TESTME_OPTIONS
       - name: Fargo MHD spherical
@@ -104,9 +111,10 @@ jobs:
     runs-on: self-hosted
     steps:
       - name: Check out repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
         with:
           submodules: recursive
+          persist-credentials: false
       - name: Hydro shearing box
         run: scripts/ci/run-tests $IDEFIX_DIR/test/HD/ShearingBox -all $TESTME_OPTIONS
       - name: MHD shearing box
@@ -117,9 +125,10 @@ jobs:
     runs-on: self-hosted
     steps:
       - name: Check out repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
         with:
           submodules: recursive
+          persist-credentials: false
       - name: Jeans Instability
         run: scripts/ci/run-tests $IDEFIX_DIR/test/SelfGravity/JeansInstability -all $TESTME_OPTIONS
       - name: Random sphere spherical
@@ -136,9 +145,10 @@ jobs:
     runs-on: self-hosted
     steps:
       - name: Check out repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
         with:
           submodules: recursive
+          persist-credentials: false
       - name: 3 body
         run: scripts/ci/run-tests $IDEFIX_DIR/test/Planet/Planet3Body -all $TESTME_OPTIONS
       - name: migration
@@ -157,9 +167,10 @@ jobs:
     runs-on: self-hosted
     steps:
       - name: Check out repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
         with:
           submodules: recursive
+          persist-credentials: false
       - name: Energy conservation
         run: scripts/ci/run-tests $IDEFIX_DIR/test/Dust/DustEnergy -all $TESTME_OPTIONS
       - name: Dusty wave
@@ -170,9 +181,10 @@ jobs:
     runs-on: self-hosted
     steps:
       - name: Check out repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
         with:
           submodules: recursive
+          persist-credentials: false
       - name: MTI
         run: scripts/ci/run-tests $IDEFIX_DIR/test/MHD/MTI -all $TESTME_OPTIONS
       - name: Spherical anisotropic diffusion
@@ -187,9 +199,10 @@ jobs:
     runs-on: self-hosted
     steps:
       - name: Check out repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
         with:
           submodules: recursive
+          persist-credentials: false
       - name: Run examples test
         run: cd test && ./checks_examples.sh $TEST_OPTIONS
 
@@ -198,9 +211,10 @@ jobs:
     runs-on: self-hosted
     steps:
       - name: Check out repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
         with:
           submodules: recursive
+          persist-credentials: false
       - name: Lookup table
         run: scripts/ci/run-tests $IDEFIX_DIR/test/utils/lookupTable -all $TESTME_OPTIONS
       - name: Dump Image
diff --git a/.github/workflows/idefix-ci.yml b/.github/workflows/idefix-ci.yml
index cb9461431..b6ed719e9 100644
--- a/.github/workflows/idefix-ci.yml
+++ b/.github/workflows/idefix-ci.yml
@@ -9,18 +9,22 @@ on:
     paths-ignore:
       - '.github/ISSUE_TEMPLATE/*'
 
+permissions: {}
+
 jobs:
   Linter:
     # Don't do this in forks
     if: ${{ github.repository == 'idefix-code/idefix' || github.repository == 'glesur/idefix' }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-python@v4
+      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+        with:
+          persist-credentials: false
+      - uses: actions/setup-python@7f4fc3e22c37d6ff65e88745f38bd3157c663f7c # v4.9.1
         with:
           python-version: 3.x
-      - uses: pre-commit/action@v3.0.0
-      - uses: pre-commit-ci/lite-action@v1.0.0
+      - uses: pre-commit/action@646c83fcd040023954eafda54b4db0192ce70507 # v3.0.0
+      - uses: pre-commit-ci/lite-action@50143aaf27e2c42e75a5e06185a471d9582e89df # v1.0.0
         if: always()
 
   icc-jobs:
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 72360011b..f0b285315 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -15,6 +15,11 @@ repos:
       - id: check-added-large-files
         args: ['--maxkb=100'] ## prevent files larger than 100kB from being commited (exclude git lfs files)
 
+  - repo: https://github.com/zizmorcore/zizmor-pre-commit
+    rev: v1.23.1
+    hooks:
+    - id: zizmor
+
   - repo: https://github.com/Lucas-C/pre-commit-hooks-nodejs
     rev: v1.1.2
     hooks: