diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
index d0e3b9982a..4bba08fce7 100644
--- a/.github/workflows/benchmark.yml
+++ b/.github/workflows/benchmark.yml
@@ -34,15 +34,15 @@ jobs:
       # For pushes to main, compare against the previous commit
       BRANCH_NAME: ${{ github.event_name == 'pull_request' && github.base_ref || github.event.before }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           fetch-depth: 10  # Fetch current commit and its parent
-      - uses: arduino/setup-protoc@v3
+      - uses: arduino/setup-protoc@c65c819552d16ad3c9b72d9dfd5ba5237b9c906b # v3.0.0
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
-      - uses: dtolnay/rust-toolchain@master
+      - uses: dtolnay/rust-toolchain@56f84321dbccf38fb67ce29ab63e4754056677e0
         with:
           toolchain: stable
-      - uses: boa-dev/criterion-compare-action@v3
+      - uses: boa-dev/criterion-compare-action@adfd3a94634fe2041ce5613eb7df09d247555b87 # v3.2.4
         with:
           branchName: ${{ env.BRANCH_NAME }}
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4199ecfa1f..2bb319317e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -37,16 +37,16 @@ jobs:
         sudo rm -rf /usr/local/lib/android
         sudo rm -rf /usr/share/dotnet
         df -h
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       with:
         submodules: true
-    - uses: dtolnay/rust-toolchain@master
+    - uses: dtolnay/rust-toolchain@56f84321dbccf38fb67ce29ab63e4754056677e0
       with:
         toolchain: ${{ matrix.rust }}
         components: rustfmt
     - name: "Set rustup profile"
       run: rustup set profile minimal
-    - uses: arduino/setup-protoc@v3
+    - uses: arduino/setup-protoc@c65c819552d16ad3c9b72d9dfd5ba5237b9c906b # v3.0.0
       with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
     - name: Test
@@ -54,16 +54,17 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       with:
         submodules: true
-    - uses: dtolnay/rust-toolchain@stable
+    - uses: dtolnay/rust-toolchain@fcf085fcb4b4b8f63f96906cd713eb52181b5ea4
       with:
+        toolchain: stable
         components: rustfmt, clippy
-    - uses: taiki-e/install-action@v2
+    - uses: taiki-e/install-action@d4635f2de61c8b8104d59cd4aede2060638378cc # v2.49.45
       with:
           tool: cargo-hack
-    - uses: arduino/setup-protoc@v3
+    - uses: arduino/setup-protoc@c65c819552d16ad3c9b72d9dfd5ba5237b9c906b # v3.0.0
       with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
     - name: Format
@@ -76,8 +77,8 @@ jobs:
         example: [opentelemetry, opentelemetry-sdk, opentelemetry-otlp, opentelemetry-zipkin]
     runs-on: ubuntu-latest # TODO: Check if this could be covered for Windows. The step used currently fails on Windows.
     steps:
-      - uses: actions/checkout@v4
-      - uses: dtolnay/rust-toolchain@nightly
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: dtolnay/rust-toolchain@a02741459ec5e501b9843ed30b535ca0a0376ae4
         with:
           toolchain: nightly-2024-06-30
           components: rustfmt
@@ -94,11 +95,11 @@ jobs:
     runs-on: ${{ matrix.os }}
     continue-on-error: true
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           submodules: true
       - name: Set up Rust ${{ matrix.rust }}
-        uses: dtolnay/rust-toolchain@master
+        uses: dtolnay/rust-toolchain@56f84321dbccf38fb67ce29ab63e4754056677e0
         with:
           toolchain: ${{ matrix.rust }}
       - name: Patch dependencies versions
@@ -109,19 +110,20 @@ jobs:
     runs-on: ubuntu-latest # This uses the step `EmbarkStudios/cargo-deny-action@v1` which is only supported on Linux
     continue-on-error: true # Prevent sudden announcement of a new advisory from failing ci
     steps:
-      - uses: actions/checkout@v4
-      - uses: EmbarkStudios/cargo-deny-action@v2
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: EmbarkStudios/cargo-deny-action@34899fc7ba81ca6268d5947a7a16b4649013fea1 # v2.0.11
         with:
           command: check advisories
   docs:
     continue-on-error: true
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: dtolnay/rust-toolchain@stable
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: dtolnay/rust-toolchain@fcf085fcb4b4b8f63f96906cd713eb52181b5ea4
         with:
+          toolchain: stable
           components: rustfmt
-      - uses: arduino/setup-protoc@v3
+      - uses: arduino/setup-protoc@c65c819552d16ad3c9b72d9dfd5ba5237b9c906b # v3.0.0
         with:
             repo-token: ${{ secrets.GITHUB_TOKEN }}
       - name: doc
@@ -134,25 +136,25 @@ jobs:
     runs-on: ubuntu-latest
     if: ${{ ! contains(github.event.pull_request.labels.*.name, 'dependencies') }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           submodules: true
-      - uses: dtolnay/rust-toolchain@stable
+      - uses: dtolnay/rust-toolchain@fcf085fcb4b4b8f63f96906cd713eb52181b5ea4
         with:
           toolchain: stable
           components: rustfmt,llvm-tools-preview
-      - uses: arduino/setup-protoc@v3
+      - uses: arduino/setup-protoc@c65c819552d16ad3c9b72d9dfd5ba5237b9c906b # v3.0.0
         with:
             repo-token: ${{ secrets.GITHUB_TOKEN }}
       - name: cargo install cargo-llvm-cov
-        uses: taiki-e/install-action@cargo-llvm-cov
+        uses: taiki-e/install-action@5075451c95db43b063f20f0c8fef04c04d5bf0ba # cargo-llvm-cov
       - name: cargo generate-lockfile
         if: hashFiles('Cargo.lock') == ''
         run: cargo generate-lockfile
       - name: cargo llvm-cov
         run: cargo llvm-cov --locked --all-features --workspace --lcov --lib --output-path lcov.info
       - name: Upload to codecov.io
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@b9fd7d16f6d7d1b5d2bec1a2887e65ceed900238 # v4.6.0
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
         with:
@@ -161,13 +163,13 @@ jobs:
     continue-on-error: true
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           submodules: true
-      - uses: dtolnay/rust-toolchain@master
+      - uses: dtolnay/rust-toolchain@56f84321dbccf38fb67ce29ab63e4754056677e0
         with:
           toolchain: stable
-      - uses: taiki-e/install-action@v2
+      - uses: taiki-e/install-action@d4635f2de61c8b8104d59cd4aede2060638378cc # v2.49.45
         with:
           tool: cargo-machete
       - name: cargo machete
diff --git a/.github/workflows/integration_tests.yml b/.github/workflows/integration_tests.yml
index 5b134a932a..c26e0578fd 100644
--- a/.github/workflows/integration_tests.yml
+++ b/.github/workflows/integration_tests.yml
@@ -18,13 +18,14 @@ jobs:
           sudo rm -rf /usr/local/lib/android
           sudo rm -rf /usr/share/dotnet
           df -h
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           submodules: true
-      - uses: dtolnay/rust-toolchain@stable
+      - uses: dtolnay/rust-toolchain@fcf085fcb4b4b8f63f96906cd713eb52181b5ea4
         with:
+          toolchain: stable
           components: rustfmt
-      - uses: arduino/setup-protoc@v3
+      - uses: arduino/setup-protoc@c65c819552d16ad3c9b72d9dfd5ba5237b9c906b # v3.0.0
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
       - name: Run integration tests
diff --git a/.github/workflows/markdown-link-check.yml b/.github/workflows/markdown-link-check.yml
index f1e1011c7b..bd38d86946 100644
--- a/.github/workflows/markdown-link-check.yml
+++ b/.github/workflows/markdown-link-check.yml
@@ -14,7 +14,7 @@ jobs:
   markdown-link-check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
       - name: Install markdown-link-check
         run: npm install -g markdown-link-check@3.11.2
diff --git a/.github/workflows/pr_naming.yml b/.github/workflows/pr_naming.yml
index 46720f0892..643b4f3366 100644
--- a/.github/workflows/pr_naming.yml
+++ b/.github/workflows/pr_naming.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: PR Conventional Commit Validation
-        uses:  ytanikin/pr-conventional-commits@1.4.1
+        uses:  ytanikin/pr-conventional-commits@8267db1bacc237419f9ed0228bb9d94e94271a1d # 1.4.1
         with:
           task_types: '["build","chore","ci","docs","feat","fix","perf","refactor","revert","test"]'
           add_label: 'false'
diff --git a/.github/workflows/semver.yml b/.github/workflows/semver.yml
index 4ab14ddd61..98475ab264 100644
--- a/.github/workflows/semver.yml
+++ b/.github/workflows/semver.yml
@@ -11,12 +11,13 @@ jobs:
     timeout-minutes: 10
     if: ${{ github.event.label.name == 'semver-check' || contains(github.event.pull_request.labels.*.name, 'semver-check') }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           submodules: true
       - name: Install stable
-        uses: dtolnay/rust-toolchain@stable
+        uses: dtolnay/rust-toolchain@fcf085fcb4b4b8f63f96906cd713eb52181b5ea4
         with:
+          toolchain: stable
           components: rustfmt
       - name: cargo-semver-checks
-        uses: obi1kenobi/cargo-semver-checks-action@v2.6
+        uses: obi1kenobi/cargo-semver-checks-action@7272cc2caa468d3e009a2b0a9cc366839348237b # v2.6