diff --git a/.github/workflows/ClimaCoreMakie.yml b/.github/workflows/ClimaCoreMakie.yml
index 551461611e..193c1e602f 100644
--- a/.github/workflows/ClimaCoreMakie.yml
+++ b/.github/workflows/ClimaCoreMakie.yml
@@ -17,7 +17,7 @@ jobs:
     timeout-minutes: 45
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - uses: julia-actions/setup-julia@v2
         with:
           version: '1.10'
diff --git a/.github/workflows/ClimaCorePlots.yml b/.github/workflows/ClimaCorePlots.yml
index af4f5d847f..8120d126b9 100644
--- a/.github/workflows/ClimaCorePlots.yml
+++ b/.github/workflows/ClimaCorePlots.yml
@@ -17,7 +17,7 @@ jobs:
     timeout-minutes: 30
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - uses: julia-actions/setup-julia@v2
         with:
           version: '1.10'
diff --git a/.github/workflows/ClimaCoreSpectra.yml b/.github/workflows/ClimaCoreSpectra.yml
index ae2fbbdc8b..c0af1b6769 100644
--- a/.github/workflows/ClimaCoreSpectra.yml
+++ b/.github/workflows/ClimaCoreSpectra.yml
@@ -17,7 +17,7 @@ jobs:
     timeout-minutes: 30
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - uses: julia-actions/setup-julia@v2
         with:
           version: '1.10'
diff --git a/.github/workflows/ClimaCoreTempestRemap.yml b/.github/workflows/ClimaCoreTempestRemap.yml
index 2b73c2c6af..2d66a30ced 100644
--- a/.github/workflows/ClimaCoreTempestRemap.yml
+++ b/.github/workflows/ClimaCoreTempestRemap.yml
@@ -18,7 +18,7 @@ jobs:
     timeout-minutes: 30
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - uses: julia-actions/setup-julia@v2
         with:
           version: '1.10'
diff --git a/.github/workflows/ClimaCoreVTK.yml b/.github/workflows/ClimaCoreVTK.yml
index 12d3deaad1..99cf5dda3d 100644
--- a/.github/workflows/ClimaCoreVTK.yml
+++ b/.github/workflows/ClimaCoreVTK.yml
@@ -17,7 +17,7 @@ jobs:
     timeout-minutes: 30
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - uses: julia-actions/setup-julia@v2
         with:
           version: '1.10'
diff --git a/.github/workflows/DocCleanup.yml b/.github/workflows/DocCleanup.yml
index aee066149d..f3ebb780ed 100644
--- a/.github/workflows/DocCleanup.yml
+++ b/.github/workflows/DocCleanup.yml
@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout gh-pages branch
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           ref: gh-pages
 
diff --git a/.github/workflows/Downstream.yml b/.github/workflows/Downstream.yml
index 28a7254fb3..c8473d03da 100644
--- a/.github/workflows/Downstream.yml
+++ b/.github/workflows/Downstream.yml
@@ -35,13 +35,13 @@ jobs:
           - '1.10'
           - '1.11'
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: julia-actions/setup-julia@v2
         with:
           version: ${{ matrix.version }}
       - uses: julia-actions/cache@v2
       - uses: julia-actions/julia-buildpkg@v1
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           repository: 'CliMA/${{ matrix.package }}'
           path: ${{ matrix.package }}
diff --git a/.github/workflows/Invalidations.yml b/.github/workflows/Invalidations.yml
index c9c98f307f..733cbb3cb7 100644
--- a/.github/workflows/Invalidations.yml
+++ b/.github/workflows/Invalidations.yml
@@ -19,12 +19,12 @@ jobs:
     - uses: julia-actions/setup-julia@v2
       with:
         version: '1.10'
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - uses: julia-actions/julia-buildpkg@v1
     - uses: julia-actions/julia-invalidations@v1
       id: invs_pr
 
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         ref: ${{ github.event.repository.default_branch }}
     - uses: julia-actions/julia-buildpkg@v1
diff --git a/.github/workflows/UnitTests.yml b/.github/workflows/UnitTests.yml
index ad5e8b0095..21ae0e8f7f 100644
--- a/.github/workflows/UnitTests.yml
+++ b/.github/workflows/UnitTests.yml
@@ -33,7 +33,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - uses: julia-actions/setup-julia@v2
         with:
           version: ${{ matrix.version }}
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 7c36f83d59..88702ea188 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -11,7 +11,7 @@ jobs:
   docbuild:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: julia-actions/setup-julia@v2
         with:
           version: '1.10'
diff --git a/.github/workflows/downgrade.yml b/.github/workflows/downgrade.yml
index 3b8e7dbd8e..ee57b6082b 100644
--- a/.github/workflows/downgrade.yml
+++ b/.github/workflows/downgrade.yml
@@ -22,7 +22,7 @@ jobs:
       matrix:
         version: ['1.10', '1.11']
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: julia-actions/setup-julia@latest
         with:
           version: ${{ matrix.version }}