diff --git a/.github/workflows/CleanPreviewDoc.yml b/.github/workflows/CleanPreviewDoc.yml
index eb19fc4..5f7b2d7 100644
--- a/.github/workflows/CleanPreviewDoc.yml
+++ b/.github/workflows/CleanPreviewDoc.yml
@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout gh-pages branch
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           ref: gh-pages
       - name: Delete preview and history + push changes
diff --git a/.github/workflows/Documentation.yml b/.github/workflows/Documentation.yml
index 521f844..4a9d130 100644
--- a/.github/workflows/Documentation.yml
+++ b/.github/workflows/Documentation.yml
@@ -34,7 +34,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: julia-actions/setup-julia@v2
         with:
           version: 'lts'
diff --git a/.github/workflows/Downstream.yml b/.github/workflows/Downstream.yml
index 12b3ff0..f006ef8 100644
--- a/.github/workflows/Downstream.yml
+++ b/.github/workflows/Downstream.yml
@@ -38,14 +38,14 @@ jobs:
           - {user: QuantumEngineeredSystems, repo: HarmonicBalance.jl}
           - {user: QuantumEngineeredSystems, repo: HarmonicSteadyState.jl}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: julia-actions/setup-julia@v2
         with:
           version: ${{ matrix.julia-version }}
           arch: x64
       - uses: julia-actions/julia-buildpkg@latest
       - name: Clone Downstream
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           repository: ${{ matrix.package.user }}/${{ matrix.package.repo }}
           path: downstream
diff --git a/.github/workflows/Format.yml b/.github/workflows/Format.yml
index 39bb451..3cfafea 100644
--- a/.github/workflows/Format.yml
+++ b/.github/workflows/Format.yml
@@ -21,7 +21,7 @@ jobs:
         with:
           version: ${{ matrix.julia-version }}
 
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Install JuliaFormatter and format
         # This will use the latest version by default but you can set the version like so:
         #
diff --git a/.github/workflows/SpellCheck.yml b/.github/workflows/SpellCheck.yml
index 97e5a5f..865c8ee 100644
--- a/.github/workflows/SpellCheck.yml
+++ b/.github/workflows/SpellCheck.yml
@@ -14,6 +14,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Actions Repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - name: Check spelling
         uses: crate-ci/typos@v1.35.3
\ No newline at end of file
diff --git a/.github/workflows/Tests.yml b/.github/workflows/Tests.yml
index 478593f..7b146ae 100644
--- a/.github/workflows/Tests.yml
+++ b/.github/workflows/Tests.yml
@@ -48,7 +48,7 @@ jobs:
         arch:
           - x64
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           persist-credentials: false
       - uses: julia-actions/setup-julia@v2
diff --git a/.github/workflows/downgrade.yml b/.github/workflows/downgrade.yml
index e88dc9f..97765c6 100644
--- a/.github/workflows/downgrade.yml
+++ b/.github/workflows/downgrade.yml
@@ -36,7 +36,7 @@ jobs:
         arch:
           - x64
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           persist-credentials: false
       - uses: julia-actions/setup-julia@v2