diff --git a/.github/workflows/dsa.yml b/.github/workflows/dsa.yml
index 702da12a..112a89cb 100644
--- a/.github/workflows/dsa.yml
+++ b/.github/workflows/dsa.yml
@@ -27,7 +27,7 @@ jobs:
           - 1.65.0 # MSRV
           - stable
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@master
         with:
           targets: ${{ matrix.target }}
@@ -52,7 +52,7 @@ jobs:
           git config --global core.autocrlf false
           git config --global core.eol lf
 
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{ matrix.toolchain }}
diff --git a/.github/workflows/ecdsa.yml b/.github/workflows/ecdsa.yml
index 2c71161b..2f7aef92 100644
--- a/.github/workflows/ecdsa.yml
+++ b/.github/workflows/ecdsa.yml
@@ -29,7 +29,7 @@ jobs:
           - 1.65.0 # MSRV
           - stable
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{ matrix.rust }}
@@ -45,7 +45,7 @@ jobs:
           - 1.65.0 # MSRV
           - stable
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{ matrix.rust }}
diff --git a/.github/workflows/ed25519.yml b/.github/workflows/ed25519.yml
index 49ac2628..af148f1c 100644
--- a/.github/workflows/ed25519.yml
+++ b/.github/workflows/ed25519.yml
@@ -27,7 +27,7 @@ jobs:
           - 1.60.0 # MSRV
           - stable
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@master
         with:
           targets: ${{ matrix.target }}
@@ -47,7 +47,7 @@ jobs:
           - stable
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{ matrix.toolchain }}
diff --git a/.github/workflows/rfc6979.yml b/.github/workflows/rfc6979.yml
index 41b044f9..425aabd6 100644
--- a/.github/workflows/rfc6979.yml
+++ b/.github/workflows/rfc6979.yml
@@ -27,7 +27,7 @@ jobs:
           - 1.61.0 # MSRV
           - stable
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{ matrix.rust }}
@@ -42,7 +42,7 @@ jobs:
           - 1.61.0 # MSRV
           - stable
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{ matrix.rust }}
diff --git a/.github/workflows/security-audit.yml b/.github/workflows/security-audit.yml
index 4b20aafb..a3030c12 100644
--- a/.github/workflows/security-audit.yml
+++ b/.github/workflows/security-audit.yml
@@ -13,7 +13,7 @@ jobs:
     name: Security Audit
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: stable
diff --git a/.github/workflows/workspace.yml b/.github/workflows/workspace.yml
index 716f2ae5..30da5785 100644
--- a/.github/workflows/workspace.yml
+++ b/.github/workflows/workspace.yml
@@ -16,7 +16,7 @@ jobs:
   rustfmt:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: stable
@@ -26,7 +26,7 @@ jobs:
   clippy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: 1.66.0