diff --git a/.github/workflows/benches.yml b/.github/workflows/benches.yml
index 4a1c9e2d42..ea41890bf3 100644
--- a/.github/workflows/benches.yml
+++ b/.github/workflows/benches.yml
@@ -25,7 +25,7 @@ jobs:
           - windows-latest
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           ref: ${{ github.event.pull_request.head.sha }}
       - uses: dtolnay/rust-toolchain@stable
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 39cb9680bd..b529ac5a83 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -48,7 +48,7 @@ jobs:
           - release
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       # Install the required target
       - uses: dtolnay/rust-toolchain@stable
         with:
diff --git a/.github/workflows/build_test_workspace.yml b/.github/workflows/build_test_workspace.yml
index 59a369b875..49ab519589 100644
--- a/.github/workflows/build_test_workspace.yml
+++ b/.github/workflows/build_test_workspace.yml
@@ -30,7 +30,7 @@ jobs:
       - name: Install dependencies
         if: matrix.os == 'macos-latest'
         run: brew install protobuf
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
       - name: Build workspace
diff --git a/.github/workflows/checks.yml b/.github/workflows/checks.yml
index 6aad196ed0..4fc6d74dcc 100644
--- a/.github/workflows/checks.yml
+++ b/.github/workflows/checks.yml
@@ -17,7 +17,7 @@ jobs:
   checks:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           ref: ${{ github.event.pull_request.head.sha }}
       - uses: dtolnay/rust-toolchain@stable
diff --git a/.github/workflows/clippy.yml b/.github/workflows/clippy.yml
index c5fbab1732..9f876c4e16 100644
--- a/.github/workflows/clippy.yml
+++ b/.github/workflows/clippy.yml
@@ -11,7 +11,7 @@ jobs:
   clippy_check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
         with:
           components: clippy
diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index 71870f63d3..ab5c66bce7 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           submodules: true
 
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 89e53f65a7..27c4f58679 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -14,7 +14,7 @@ jobs:
   checks:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
       - run: cargo doc -p openmls
diff --git a/.github/workflows/fuzz.yml b/.github/workflows/fuzz.yml
index 5570f31fdf..83957fb5d0 100644
--- a/.github/workflows/fuzz.yml
+++ b/.github/workflows/fuzz.yml
@@ -30,7 +30,7 @@ jobs:
             runs: 50000
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: nightly
diff --git a/.github/workflows/gh-pages.yml b/.github/workflows/gh-pages.yml
index 1fcc69e7c1..627d9275c3 100644
--- a/.github/workflows/gh-pages.yml
+++ b/.github/workflows/gh-pages.yml
@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: hecrj/setup-rust-action@master
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
       - name: Setup mdBook
diff --git a/.github/workflows/interop.yml b/.github/workflows/interop.yml
index 33bba0f8d4..161176372d 100644
--- a/.github/workflows/interop.yml
+++ b/.github/workflows/interop.yml
@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: OpenMLS | Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: OpenMLS | Install dependencies
         run: sudo apt-get -y install protobuf-compiler
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 4c9dc1cb00..1bc2c8d870 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -28,7 +28,7 @@ jobs:
           - release
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           ref: ${{ github.event.pull_request.head.sha }}
       - uses: dtolnay/rust-toolchain@stable