diff --git a/.github/workflows/cachix.yml b/.github/workflows/cachix.yml
index e2c1ce5..a6f89a5 100644
--- a/.github/workflows/cachix.yml
+++ b/.github/workflows/cachix.yml
@@ -31,7 +31,7 @@ jobs:
           remove-haskell: true
           remove-codeql: true
 
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         name: Checkout
 
       - uses: cachix/install-nix-action@v20
diff --git a/.github/workflows/check-docs.yml b/.github/workflows/check-docs.yml
index eb6d6df..40e5c8b 100644
--- a/.github/workflows/check-docs.yml
+++ b/.github/workflows/check-docs.yml
@@ -34,7 +34,7 @@ jobs:
             experimental-features = nix-command flakes
           nix_path: nixpkgs=channel:nixos-unstable
 
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         name: Checkout
 
       - name: Set default git branch (to reduce log spam)
diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index c6d46d6..8c2b586 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -14,7 +14,7 @@ jobs:
     name: Validate Flake
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: cachix/install-nix-action@v20
         with:
           extra_nix_config: |
@@ -25,7 +25,7 @@ jobs:
     name: Formatting via Alejandra
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: cachix/install-nix-action@v20
         with:
           install_url: https://nixos.org/nix/install
diff --git a/.github/workflows/manual.yml b/.github/workflows/manual.yml
index 321d23e..b71ffa6 100644
--- a/.github/workflows/manual.yml
+++ b/.github/workflows/manual.yml
@@ -24,7 +24,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Install Nix
         uses: cachix/install-nix-action@v18