diff --git a/.github/workflows/deploy-docs.yml b/.github/workflows/deploy-docs.yml
index a57bfbcd..7e68a4f7 100644
--- a/.github/workflows/deploy-docs.yml
+++ b/.github/workflows/deploy-docs.yml
@@ -12,14 +12,14 @@ jobs:
 
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
       - name: Install Rust
         run: rustup update stable
       - name: Generate docs
         working-directory: sds
         run: cargo doc --no-deps
       - name: Upload Rust docs
-        uses: actions/upload-pages-artifact@v3
+        uses: actions/upload-pages-artifact@56afc609e74202658d3ffba0e8f6dda462b719fa # v3.0.1
         with:
           path: ./sds/target/doc
   deploy:
@@ -31,4 +31,4 @@ jobs:
 
     steps:
       - name: Deploy to Github pages
-        uses: actions/deploy-pages@v4
\ No newline at end of file
+        uses: actions/deploy-pages@d6db90164ac5ed86f2b6aed7e0febac5b3c0c03e # v4.0.5
\ No newline at end of file
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 338d7060..ac4b19f8 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -28,8 +28,8 @@ jobs:
   sds:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: Swatinem/rust-cache@v2
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+      - uses: Swatinem/rust-cache@e18b497796c12c097a38f9edb9d0641fb99eee32 # v2.0.0
       - name: "Rust checks"
         run: bash ./scripts/rust_checks.sh
       - name: "Rust tests"
@@ -37,7 +37,7 @@ jobs:
   sds-go:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
       - run: source "$HOME/.cargo/env"
       - name: "Build the SDS Go/Rust wrapper"
         run: make build-sds-go
@@ -60,7 +60,7 @@ jobs:
   license-3rdparty:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
       - name: "Install dd-rust-license-tool"
         run: cargo install dd-rust-license-tool
       - name: "Check LICENSE-3rdparty.csv"
diff --git a/.github/workflows/trigger_pr.yml b/.github/workflows/trigger_pr.yml
index 00e1a108..e7756819 100644
--- a/.github/workflows/trigger_pr.yml
+++ b/.github/workflows/trigger_pr.yml
@@ -29,7 +29,7 @@ jobs:
           echo "COMMIT_AUTHOR=$author" >> "$GITHUB_OUTPUT"
       - name: Generate a token
         id: generate-token
-        uses: actions/create-github-app-token@v1
+        uses: actions/create-github-app-token@d72941d797fd3113feb6b93fd0dec494b13a2547 # v1.12.0
         with:
           app-id: ${{ vars.TRIGGER_APP_ID }}
           private-key: ${{ secrets.TRIGGER_GITHUB_APP_PRIVATE_KEY }}