diff --git a/.github/workflows/checks_docker.yaml b/.github/workflows/checks_docker.yaml
index 78770bd3..96b46661 100644
--- a/.github/workflows/checks_docker.yaml
+++ b/.github/workflows/checks_docker.yaml
@@ -7,25 +7,33 @@ on:
   push:
     branches: [main]
 
+permissions:
+  contents: read
+
 jobs:
   build-docker:
     name: Build Docker image
     runs-on: warp-ubuntu-latest-x64-16x
 
     steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@95d9a5deda9de15063e7595e9719c11c38c90ae2 # v2.13.2
+        with:
+          egress-policy: audit
+
       - name: Checkout sources
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
         with:
           fetch-depth: 0
 
       - name: Docker QEMU
-        uses: docker/setup-qemu-action@v3
+        uses: docker/setup-qemu-action@c7c53464625b32c7a7e944ae62b3e17d2b600130 # v3.7.0
 
       - name: Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435 # v3.11.1
 
       - name: Docker Build
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@ca052bb54ab0790a636c9b5f226502c73d547a25 # v5.4.0
         with:
           cache-from: type=gha
           cache-to: type=gha,mode=max
diff --git a/.github/workflows/docker_build.yaml b/.github/workflows/docker_build.yaml
index 1f3a24c4..7293e8a0 100644
--- a/.github/workflows/docker_build.yaml
+++ b/.github/workflows/docker_build.yaml
@@ -5,6 +5,9 @@ on:
   schedule:
     - cron: "0 1 * * *"
 
+permissions:
+  contents: read
+
 jobs:
   extract-version:
     name: Extract version
@@ -12,6 +15,11 @@ jobs:
     outputs:
       VERSION: ${{ steps.extract_version.outputs.VERSION }}
     steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@95d9a5deda9de15063e7595e9719c11c38c90ae2 # v2.13.2
+        with:
+          egress-policy: audit
+
       - name: Extract version
         id: extract_version
         run: |
@@ -54,19 +62,24 @@ jobs:
             target: rbuilder-reproducible-runtime
             tag_suffix: "-reproducible"
     steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@95d9a5deda9de15063e7595e9719c11c38c90ae2 # v2.13.2
+        with:
+          egress-policy: audit
+
       - name: checkout sources
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
         with:
           fetch-depth: 0
 
       - name: docker qemu
-        uses: docker/setup-qemu-action@v3
+        uses: docker/setup-qemu-action@c7c53464625b32c7a7e944ae62b3e17d2b600130 # v3.7.0
 
       - name: docker buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435 # v3.11.1
 
       - name: docker metadata
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@318604b99e75e41977312d83839a89be02ca4893 # v5.9.0
         id: meta
         with:
           images: ghcr.io/${{ github.repository }}
@@ -76,14 +89,14 @@ jobs:
             type=schedule,pattern=nightly
 
       - name: docker login
-        uses: docker/login-action@v3
+        uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef # v3.6.0
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: docker build and push op-rbuilder
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@ca052bb54ab0790a636c9b5f226502c73d547a25 # v5.4.0
         with:
           cache-from: type=gha
           cache-to: type=gha,mode=max
diff --git a/.github/workflows/op_rbuilder_checks.yaml b/.github/workflows/op_rbuilder_checks.yaml
index 524360de..d0106ac0 100644
--- a/.github/workflows/op_rbuilder_checks.yaml
+++ b/.github/workflows/op_rbuilder_checks.yaml
@@ -25,27 +25,32 @@ jobs:
           - ""
 
     steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@95d9a5deda9de15063e7595e9719c11c38c90ae2 # v2.13.2
+        with:
+          egress-policy: audit
+
       - name: Checkout sources
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
 
       # https://github.com/dtolnay/rust-toolchain
       - name: Setup rust toolchain
-        uses: dtolnay/rust-toolchain@stable
+        uses: dtolnay/rust-toolchain@6d9817901c499d6b02debbb57edb38d33daa680b # stable
         with:
           toolchain: ${{ matrix.toolchain }}
           components: "rustfmt,clippy"
 
       # https://github.com/swatinem/rust-cache
-      - name: Run Swatinem/rust-cache@v2
+      - name: Run Swatinem/rust-cache@98c8021b550208e191a6a3145459bfc9fb29c4c0 # v2.8.0
         if: ${{ !env.ACT }}
-        uses: Swatinem/rust-cache@v2
+        uses: Swatinem/rust-cache@98c8021b550208e191a6a3145459bfc9fb29c4c0 # v2.8.0
         with:
           cache-on-failure: true
 
       # https://github.com/Mozilla-Actions/sccache-action
       - name: Run sccache-action
         if: ${{ !env.ACT }}
-        uses: mozilla-actions/sccache-action@v0.0.9
+        uses: mozilla-actions/sccache-action@7d986dd989559c6ecdb630a3fd2557667be217ad # v0.0.9
 
       - name: Set sccache env vars
         if: ${{ !env.ACT }}
@@ -54,7 +59,7 @@ jobs:
           echo "RUSTC_WRAPPER=sccache" >> $GITHUB_ENV
 
       - name: Install Foundry toolchain
-        uses: foundry-rs/foundry-toolchain@v1
+        uses: foundry-rs/foundry-toolchain@50d5a8956f2e319df19e6b57539d7e2acb9f8c1e # v1.5.0
         with:
           version: nightly
 
diff --git a/.github/workflows/op_rbuilder_release.yaml b/.github/workflows/op_rbuilder_release.yaml
index 37303146..e9291393 100644
--- a/.github/workflows/op_rbuilder_release.yaml
+++ b/.github/workflows/op_rbuilder_release.yaml
@@ -31,6 +31,9 @@ on:
         required: false
         type: choice
 
+permissions:
+  contents: read
+
 jobs:
   extract-version:
     name: Extract version
@@ -38,6 +41,11 @@ jobs:
     outputs:
       VERSION: ${{ steps.extract-version.outputs.VERSION }}
     steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@95d9a5deda9de15063e7595e9719c11c38c90ae2 # v2.13.2
+        with:
+          egress-policy: audit
+
       - name: Extract version
         id: extract-version
         run: |
@@ -83,6 +91,11 @@ jobs:
           - ${{ github.event.inputs.features || '' }}
 
     steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@95d9a5deda9de15063e7595e9719c11c38c90ae2 # v2.13.2
+        with:
+          egress-policy: audit
+
       - name: Install dependencies
         run: |
           apt-get update
@@ -96,7 +109,7 @@ jobs:
             protobuf-compiler
           curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
 
-      - uses: actions/checkout@v4 # must install git before checkout and set safe.directory after checkout because of container
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
 
       - name: Build op-rbuilder binary
         run: |
@@ -111,7 +124,7 @@ jobs:
           CXXFLAGS="-D__TIME__=\"\" -D__DATE__=\"\"" \
           cargo build --release --features=${{ matrix.features }} --locked --target ${{ matrix.configs.target }} --package op-rbuilder
       - name: Upload op-rbuilder artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
         with:
           name: op-rbuilder-${{ env.VERSION }}-${{ matrix.configs.target }}${{ matrix.features && '-' }}${{ matrix.features }}
           path: target/${{ matrix.configs.target }}/release/op-rbuilder
@@ -126,11 +139,16 @@ jobs:
     permissions:
       contents: write
     steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@95d9a5deda9de15063e7595e9719c11c38c90ae2 # v2.13.2
+        with:
+          egress-policy: audit
+
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
 
       - name: Download artifacts
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@634f93cb2916e3fdff6788551b99b062d0335ce0 # v5.0.0
         with:
           merge-multiple: false
           path: artifacts
@@ -150,7 +168,7 @@ jobs:
           cat sha256sums.txt
 
       - name: Create release draft
-        uses: softprops/action-gh-release@v2.0.5
+        uses: softprops/action-gh-release@69320dbe05506a9a39fc8ae11030b214ec2d1f87 # v2.0.5
         id: create-release-draft
         with:
           draft: true
@@ -183,8 +201,13 @@ jobs:
           - platform: linux/arm64
             runner: warp-ubuntu-latest-arm64-16x
     steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@95d9a5deda9de15063e7595e9719c11c38c90ae2 # v2.13.2
+        with:
+          egress-policy: audit
+
       - name: checkout sources
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
 
       - name: set env
         run: |
@@ -192,13 +215,13 @@ jobs:
           echo "PLATFORM=${platform#*/}" >> $GITHUB_ENV
 
       - name: docker qemu
-        uses: docker/setup-qemu-action@v3
+        uses: docker/setup-qemu-action@c7c53464625b32c7a7e944ae62b3e17d2b600130 # v3.7.0
 
       - name: docker buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435 # v3.11.1
 
       - name: docker metadata
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@318604b99e75e41977312d83839a89be02ca4893 # v5.9.0
         id: meta
         with:
           images: ghcr.io/${{ github.repository }}
@@ -211,14 +234,14 @@ jobs:
             type=raw,value=latest,enable=${{ !contains(env.VERSION, '-') }},suffix=-${{ env.PLATFORM }}
 
       - name: docker login
-        uses: docker/login-action@v3
+        uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef # v3.6.0
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: docker build and push op-rbuilder
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@ca052bb54ab0790a636c9b5f226502c73d547a25 # v5.4.0
         id: build
         with:
           cache-from: type=gha
@@ -240,7 +263,7 @@ jobs:
           touch "/tmp/digests/${digest#sha256:}"
 
       - name: upload digest
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
         with:
           name: digests-${{ env.PLATFORM }}
           path: /tmp/digests/*
@@ -256,18 +279,23 @@ jobs:
       - extract-version
       - publish-container-image
     steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@95d9a5deda9de15063e7595e9719c11c38c90ae2 # v2.13.2
+        with:
+          egress-policy: audit
+
       - name: download digests
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4.3.0
         with:
           path: /tmp/digests
           pattern: digests-*
           merge-multiple: true
 
       - name: setup docker buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435 # v3.11.1
 
       - name: login to ghcr
-        uses: docker/login-action@v3
+        uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef # v3.6.0
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
@@ -275,7 +303,7 @@ jobs:
 
       - name: generate container metadata
         id: meta
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@318604b99e75e41977312d83839a89be02ca4893 # v5.9.0
         with:
           images: ghcr.io/${{ github.repository }}
           labels: org.opencontainers.image.source=${{ github.repositoryUrl }}
diff --git a/.github/workflows/op_rbuilder_reproducible_verify.yaml b/.github/workflows/op_rbuilder_reproducible_verify.yaml
index a59a86ba..b582a4fa 100644
--- a/.github/workflows/op_rbuilder_reproducible_verify.yaml
+++ b/.github/workflows/op_rbuilder_reproducible_verify.yaml
@@ -10,8 +10,13 @@ jobs:
     name: "[op-rbuilder] Verify reproducible builds"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: dtolnay/rust-toolchain@stable
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@95d9a5deda9de15063e7595e9719c11c38c90ae2 # v2.13.2
+        with:
+          egress-policy: audit
+
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+      - uses: dtolnay/rust-toolchain@6d9817901c499d6b02debbb57edb38d33daa680b # stable
       - name: Build twice and compare
         run: |
           export REPRO_FLAGS="--C target-feature=+crt-static -C link-arg=-static-libgcc -C link-arg=-Wl,--build-id=none -C metadata='' --remap-path-prefix=$(pwd)=."
diff --git a/.github/workflows/tdx_quote_provider_checks.yaml b/.github/workflows/tdx_quote_provider_checks.yaml
index 48f83bda..3e8e1044 100644
--- a/.github/workflows/tdx_quote_provider_checks.yaml
+++ b/.github/workflows/tdx_quote_provider_checks.yaml
@@ -16,11 +16,16 @@ jobs:
       run:
         working-directory: "./crates/tdx-quote-provider"
     steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@95d9a5deda9de15063e7595e9719c11c38c90ae2 # v2.13.2
+        with:
+          egress-policy: audit
+
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
 
       - name: Set up Rust
-        uses: dtolnay/rust-toolchain@stable
+        uses: dtolnay/rust-toolchain@6d9817901c499d6b02debbb57edb38d33daa680b # stable
         with:
           toolchain: stable
           components: rustfmt
@@ -29,7 +34,7 @@ jobs:
         run: sudo apt-get update && sudo apt-get install -y libtss2-dev
 
       - name: Cache dependencies
-        uses: Swatinem/rust-cache@v2
+        uses: Swatinem/rust-cache@98c8021b550208e191a6a3145459bfc9fb29c4c0 # v2.8.0
 
       - name: Run build
         run: cargo build
@@ -53,13 +58,18 @@ jobs:
       run:
         working-directory: "./crates/tdx-quote-provider"
     steps:
-      - uses: actions/checkout@v4
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@95d9a5deda9de15063e7595e9719c11c38c90ae2 # v2.13.2
+        with:
+          egress-policy: audit
+
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435 # v3.11.1
 
       - name: Build Docker image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@ca052bb54ab0790a636c9b5f226502c73d547a25 # v5.4.0
         with:
           context: .
           push: false
diff --git a/.github/workflows/tdx_quote_provider_release.yaml b/.github/workflows/tdx_quote_provider_release.yaml
index 0506f7c6..aa4c2da9 100644
--- a/.github/workflows/tdx_quote_provider_release.yaml
+++ b/.github/workflows/tdx_quote_provider_release.yaml
@@ -19,6 +19,9 @@ on:
         required: false
         type: choice
 
+permissions:
+  contents: read
+
 jobs:
   extract-version:
     name: Extract version
@@ -26,6 +29,11 @@ jobs:
     outputs:
       VERSION: ${{ steps.extract_version.outputs.VERSION }}
     steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@95d9a5deda9de15063e7595e9719c11c38c90ae2 # v2.13.2
+        with:
+          egress-policy: audit
+
       - name: Extract version
         id: extract_version
         run: |
@@ -68,6 +76,11 @@ jobs:
           - ${{ github.event.inputs.features || '' }}
 
     steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@95d9a5deda9de15063e7595e9719c11c38c90ae2 # v2.13.2
+        with:
+          egress-policy: audit
+
       - name: Install dependencies
         run: |
           apt-get update
@@ -82,7 +95,7 @@ jobs:
             protobuf-compiler
           curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
 
-      - uses: actions/checkout@v4 # must install git before checkout and set safe.directory after checkout because of container
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
 
       - name: Build tdx-quote-provider binary
         run: |
@@ -91,7 +104,7 @@ jobs:
           cargo build --release --features=${{ matrix.features }} --target ${{ matrix.configs.target }} --package tdx-quote-provider
 
       - name: Upload artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
         with:
           name: tdx-quote-provider-${{ needs.extract-version.outputs.VERSION }}-${{ matrix.configs.target }}${{ matrix.features && '-' }}${{ matrix.features }}
           path: target/${{ matrix.configs.target }}/release/tdx-quote-provider
@@ -106,11 +119,16 @@ jobs:
     permissions:
       contents: write
     steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@95d9a5deda9de15063e7595e9719c11c38c90ae2 # v2.13.2
+        with:
+          egress-policy: audit
+
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
 
       - name: Download artifacts
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4.3.0
         with:
           merge-multiple: true
           path: artifacts
@@ -130,7 +148,7 @@ jobs:
           cat sha256sums.txt
 
       - name: Create release draft
-        uses: softprops/action-gh-release@v2.0.5
+        uses: softprops/action-gh-release@69320dbe05506a9a39fc8ae11030b214ec2d1f87 # v2.0.5
         id: create-release-draft
         with:
           draft: true