diff --git a/.github/workflows/dotnet.yaml b/.github/workflows/dotnet.yaml
index 375e006..05ede07 100644
--- a/.github/workflows/dotnet.yaml
+++ b/.github/workflows/dotnet.yaml
@@ -25,7 +25,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         fetch-depth: 0 # so that NerdBank.GitVersioning has access to history
     - name: Install Nix
@@ -44,7 +44,7 @@ jobs:
   selftest-intended-failures:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         fetch-depth: 0 # so that NerdBank.GitVersioning has access to history
     - name: Install Nix
@@ -81,7 +81,7 @@ jobs:
       statuses: read
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         fetch-depth: 0 # so that NerdBank.GitVersioning has access to history
     - name: Install Nix
@@ -109,7 +109,7 @@ jobs:
       security-events: write
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           fetch-depth: 0 # so that NerdBank.GitVersioning has access to history
       - name: Install Nix
@@ -128,7 +128,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - name: Install Nix
         uses: cachix/install-nix-action@v31
         with:
@@ -143,7 +143,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - name: Install Nix
         uses: cachix/install-nix-action@v31
         with:
@@ -156,7 +156,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - name: Install Nix
         uses: cachix/install-nix-action@v31
         with:
@@ -194,7 +194,7 @@ jobs:
   nuget-pack:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         fetch-depth: 0 # so that NerdBank.GitVersioning has access to history
     - name: Install Nix
@@ -297,7 +297,7 @@ jobs:
       attestations: write
       contents: read
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Install Nix
         uses: cachix/install-nix-action@v31
         with:
@@ -329,7 +329,7 @@ jobs:
       attestations: write
       contents: read
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Install Nix
         uses: cachix/install-nix-action@v31
         with:
@@ -360,7 +360,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: [nuget-pack]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Download NuGet artifact (tool)
         uses: actions/download-artifact@v5
         with:
@@ -396,7 +396,7 @@ jobs:
     permissions:
       contents: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Download NuGet artifact (tool)
         uses: actions/download-artifact@v5
         with:
diff --git a/.github/workflows/flake_update.yaml b/.github/workflows/flake_update.yaml
index 9a84993..36cdb6e 100644
--- a/.github/workflows/flake_update.yaml
+++ b/.github/workflows/flake_update.yaml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Install Nix
         uses: DeterminateSystems/nix-installer-action@main