diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 4c5aea4..d332916 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -30,7 +30,7 @@ jobs:
           # Split and keep last
           echo "APP_NAME=${GITHUB_REPOSITORY##*/}" >> $GITHUB_ENV
 
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
 
       - name: Validate release version
         run: |
@@ -48,7 +48,7 @@ jobs:
 
       - name: Cache Composer packages
         id: composer-cache
-        uses: actions/cache@v6
+        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6
         with:
           path: vendor
           key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
diff --git a/.github/workflows/test-backend.yml b/.github/workflows/test-backend.yml
index 96638d8..c069b9a 100644
--- a/.github/workflows/test-backend.yml
+++ b/.github/workflows/test-backend.yml
@@ -53,7 +53,7 @@ jobs:
       - name: Copy Nextcloud source
         run: ln -s /usr/src/nextcloud/* ${GITHUB_WORKSPACE}/
 
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
         with:
           path: apps/fulltextsearch_sql
 
diff --git a/.github/workflows/test-frontend.yml b/.github/workflows/test-frontend.yml
index 726e789..e08f72b 100644
--- a/.github/workflows/test-frontend.yml
+++ b/.github/workflows/test-frontend.yml
@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     name: Frontend
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
 
       - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
         with: