diff --git a/.github/workflows/broken-links.yml b/.github/workflows/broken-links.yml
index daf7d9b2a6f..542275d6e33 100644
--- a/.github/workflows/broken-links.yml
+++ b/.github/workflows/broken-links.yml
@@ -17,7 +17,7 @@ jobs:
     runs-on: [plutus-ci, self-hosted]
     steps:
       - name: Checkout
-        uses: actions/checkout@v4.3.0
+        uses: actions/checkout@v5.0.1
 
       - name: Run Linkchecker
         run: |
diff --git a/.github/workflows/cabal-build-all.yml b/.github/workflows/cabal-build-all.yml
index 22e4b51065e..d7a3876af45 100644
--- a/.github/workflows/cabal-build-all.yml
+++ b/.github/workflows/cabal-build-all.yml
@@ -25,7 +25,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4.3.0
+        uses: actions/checkout@v5.0.1
 
       - name: Cold Build / ${{ matrix.ghc }} / x86_64-linux
         run: | 
diff --git a/.github/workflows/changelog-label.yml b/.github/workflows/changelog-label.yml
index c1aeed262ce..d5dd6a191e9 100644
--- a/.github/workflows/changelog-label.yml
+++ b/.github/workflows/changelog-label.yml
@@ -19,7 +19,7 @@ jobs:
       issues: write
     steps:
       - name: Checkout
-        uses: actions/checkout@v4.3.0
+        uses: actions/checkout@v5.0.1
 
       - name: Find Changed Files
         id: changed-files
diff --git a/.github/workflows/code-coverage-report.yml b/.github/workflows/code-coverage-report.yml
index faf0be7f628..1e5aa063a50 100644
--- a/.github/workflows/code-coverage-report.yml
+++ b/.github/workflows/code-coverage-report.yml
@@ -19,7 +19,7 @@ jobs:
       name: github-pages
     steps:
       - name: Checkout
-        uses: actions/checkout@v4.3.0
+        uses: actions/checkout@v5.0.1
 
       - name: Build Report
         run: | 
diff --git a/.github/workflows/compare-golden-budgets.yaml b/.github/workflows/compare-golden-budgets.yaml
index c178d49b8ca..e18181d2094 100644
--- a/.github/workflows/compare-golden-budgets.yaml
+++ b/.github/workflows/compare-golden-budgets.yaml
@@ -14,7 +14,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4.3.0
+        uses: actions/checkout@v5.0.1
         with:
           fetch-depth: 5
 
diff --git a/.github/workflows/cost-model-benchmark.yml b/.github/workflows/cost-model-benchmark.yml
index b95787ebb12..09e8fc8c9bf 100644
--- a/.github/workflows/cost-model-benchmark.yml
+++ b/.github/workflows/cost-model-benchmark.yml
@@ -20,7 +20,7 @@ jobs:
     timeout-minutes: 1800 # (30 hours) These benchmarks take over 10 hours to run.
     steps:
       - name: Checkout
-        uses: actions/checkout@v4.3.0
+        uses: actions/checkout@v5.0.1
 
       - name: Run Benchmark
         run: nix --accept-flake-config run .#cost-model-budgeting-bench -- --csv results.csv ${{ inputs.extra-bench-args }}
diff --git a/.github/workflows/docusaurus-site.yml b/.github/workflows/docusaurus-site.yml
index c13c5138d1e..1fd7d897286 100644
--- a/.github/workflows/docusaurus-site.yml
+++ b/.github/workflows/docusaurus-site.yml
@@ -30,7 +30,7 @@ jobs:
       name: github-pages
     steps:
       - name: Checkout
-        uses: actions/checkout@v4.3.0
+        uses: actions/checkout@v5.0.1
 
       - name: Build Site 
         if: github.event_name == 'push' || github.event_name == 'workflow_dispatch'
diff --git a/.github/workflows/haddock-site.yml b/.github/workflows/haddock-site.yml
index e113d853ca8..26821cc27c5 100644
--- a/.github/workflows/haddock-site.yml
+++ b/.github/workflows/haddock-site.yml
@@ -68,7 +68,7 @@ jobs:
       name: github-pages
     steps:
       - name: Checkout gh-pages
-        uses: actions/checkout@v4.3.0
+        uses: actions/checkout@v5.0.1
         with:
           ref: gh-pages
 
@@ -87,7 +87,7 @@ jobs:
           fi  
 
       - name: Checkout
-        uses: actions/checkout@v4.3.0
+        uses: actions/checkout@v5.0.1
         with:
           ref: ${{ inputs.ref || github.ref_name }}
 
diff --git a/.github/workflows/longitudinal-benchmark.yml b/.github/workflows/longitudinal-benchmark.yml
index d84101ec9c3..02fdd3bce08 100644
--- a/.github/workflows/longitudinal-benchmark.yml
+++ b/.github/workflows/longitudinal-benchmark.yml
@@ -29,7 +29,7 @@ jobs:
     runs-on: [self-hosted, plutus-benchmark]
     steps:
       - name: Checkout 
-        uses: actions/checkout@v4.3.0 
+        uses: actions/checkout@v5.0.1 
 
       - name: Run Benchmarks
         env: 
diff --git a/.github/workflows/manual-benchmark.yml b/.github/workflows/manual-benchmark.yml
index d7c8f01ae31..5348f7ef3ad 100644
--- a/.github/workflows/manual-benchmark.yml
+++ b/.github/workflows/manual-benchmark.yml
@@ -27,7 +27,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4.3.0
+        uses: actions/checkout@v5.0.1
         with:
           # It's possible that new commits get merged into master since the PR 
           # was opened. We need a safe buffer to make sure that our use of merge-head 
diff --git a/.github/workflows/metatheory-site.yml b/.github/workflows/metatheory-site.yml
index a9f0741fd31..22a977e230b 100644
--- a/.github/workflows/metatheory-site.yml
+++ b/.github/workflows/metatheory-site.yml
@@ -53,7 +53,7 @@ jobs:
       name: github-pages
     steps:
       - name: Checkout
-        uses: actions/checkout@v4.3.0
+        uses: actions/checkout@v5.0.1
         with:
           ref: ${{ inputs.ref || github.ref_name }}
 
diff --git a/.github/workflows/nightly-testsuite.yml b/.github/workflows/nightly-testsuite.yml
index ead933f702c..0c3f1f5324b 100644
--- a/.github/workflows/nightly-testsuite.yml
+++ b/.github/workflows/nightly-testsuite.yml
@@ -25,7 +25,7 @@ jobs:
     runs-on: [self-hosted, plutus-ci]
     steps:
       - name: Checkout
-        uses: actions/checkout@v4.3.0
+        uses: actions/checkout@v5.0.1
 
       - name: Run Plutus Core Test
         run: | 
diff --git a/.github/workflows/papers-and-specs.yml b/.github/workflows/papers-and-specs.yml
index 28e5269c801..064265d0912 100644
--- a/.github/workflows/papers-and-specs.yml
+++ b/.github/workflows/papers-and-specs.yml
@@ -28,7 +28,7 @@ jobs:
       name: github-pages
     steps:
       - name: Checkout
-        uses: actions/checkout@v4.3.0
+        uses: actions/checkout@v5.0.1
 
       - name: Build Papers
         run: |