diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4b88a75b9..6eb893921 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -117,7 +117,7 @@ jobs:
           rust: nightly
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
 
     - name: Install packages (Ubuntu)
       if: matrix.os == 'ubuntu-latest'
@@ -125,7 +125,7 @@ jobs:
         ci/ubuntu-install-packages
 
     - name: Install Rust
-      uses: dtolnay/rust-toolchain@master
+      uses: dtolnay/rust-toolchain@6c977a6ca4077a0ceb28ffbe03f59d46e9ac8772 # master
       with:
         toolchain: ${{ matrix.rust }}
 
@@ -208,9 +208,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
     - name: Install Rust
-      uses: dtolnay/rust-toolchain@master
+      uses: dtolnay/rust-toolchain@6c977a6ca4077a0ceb28ffbe03f59d46e9ac8772 # master
       with:
         toolchain: stable
     - name: Add wasm32-wasip1 target
@@ -222,9 +222,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
     - name: Install Rust
-      uses: dtolnay/rust-toolchain@master
+      uses: dtolnay/rust-toolchain@6c977a6ca4077a0ceb28ffbe03f59d46e9ac8772 # master
       with:
         toolchain: stable
         components: rustfmt
@@ -235,9 +235,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
       - name: Install Rust
-        uses: dtolnay/rust-toolchain@master
+        uses: dtolnay/rust-toolchain@6c977a6ca4077a0ceb28ffbe03f59d46e9ac8772 # master
         with:
           toolchain: stable
       - name: Check documentation
@@ -250,7 +250,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
 
       - name: Install required packages (Ubuntu)
         run: |
@@ -258,7 +258,7 @@ jobs:
           sudo apt-get install g++ --yes
 
       - name: Install Rust
-        uses: dtolnay/rust-toolchain@master
+        uses: dtolnay/rust-toolchain@6c977a6ca4077a0ceb28ffbe03f59d46e9ac8772 # master
         with:
           toolchain: stable
 
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 7cd62b4b9..dada8081a 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -20,7 +20,7 @@ jobs:
     name: create-release
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
       - name: Get the release version from the tag
         if: env.VERSION == ''
         run: echo "VERSION=${{ github.ref_name }}" >> $GITHUB_ENV
@@ -139,7 +139,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
 
     - name: Install packages (Ubuntu)
       if: matrix.os == 'ubuntu-latest'
@@ -148,7 +148,7 @@ jobs:
         ci/ubuntu-install-packages
 
     - name: Install Rust
-      uses: dtolnay/rust-toolchain@master
+      uses: dtolnay/rust-toolchain@6c977a6ca4077a0ceb28ffbe03f59d46e9ac8772 # master
       with:
         toolchain: ${{ matrix.rust }}
         target: ${{ matrix.target }}
@@ -311,7 +311,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
 
     - name: Install packages (Ubuntu)
       shell: bash
@@ -319,7 +319,7 @@ jobs:
         ci/ubuntu-install-packages
 
     - name: Install Rust
-      uses: dtolnay/rust-toolchain@master
+      uses: dtolnay/rust-toolchain@6c977a6ca4077a0ceb28ffbe03f59d46e9ac8772 # master
       with:
         toolchain: nightly
         target: ${{ env.TARGET }}