diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b03141a..bd62d51 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -11,7 +11,7 @@ jobs:
     name: nix (${{ matrix.os }})
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4.1.7
+      - uses: actions/checkout@v4.2.1
       - uses: DeterminateSystems/nix-installer-action@main
       - uses: DeterminateSystems/magic-nix-cache-action@main
       - run: nix --show-trace build -f . custom jacobi_tools
diff --git a/.github/workflows/formatting.yml b/.github/workflows/formatting.yml
index 8988844..a62a62f 100644
--- a/.github/workflows/formatting.yml
+++ b/.github/workflows/formatting.yml
@@ -4,7 +4,7 @@ jobs:
   prettier:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4.1.7
+      - uses: actions/checkout@v4.2.1
       - uses: cachix/install-nix-action@V27
         with:
           extra_nix_config: |
@@ -14,7 +14,7 @@ jobs:
   nixpkgs-fmt:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4.1.7
+      - uses: actions/checkout@v4.2.1
       - uses: cachix/install-nix-action@V27
         with:
           extra_nix_config: |
diff --git a/.github/workflows/statix.yml b/.github/workflows/statix.yml
index d76eaf0..b9295c2 100644
--- a/.github/workflows/statix.yml
+++ b/.github/workflows/statix.yml
@@ -4,7 +4,7 @@ jobs:
   statix:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4.1.7
+      - uses: actions/checkout@v4.2.1
       - uses: cachix/install-nix-action@V27
         with:
           extra_nix_config: |