diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index f5b0a35..7ec6459 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -15,7 +15,7 @@ jobs:
         # Login shell is required to include changes by conda init bash.
         shell: bash -l -eo pipefail {0}
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - uses: conda-incubator/setup-miniconda@v3
       with:
         python-version: "3.9"
diff --git a/.github/workflows/deploy-viz-app.yaml b/.github/workflows/deploy-viz-app.yaml
index 995d29a..148076f 100644
--- a/.github/workflows/deploy-viz-app.yaml
+++ b/.github/workflows/deploy-viz-app.yaml
@@ -26,7 +26,7 @@ jobs:
       url: ${{ steps.deployment.outputs.page_url }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: actions/setup-node@v4
         with:
           node-version: 18
diff --git a/.github/workflows/run-usa-models.yaml b/.github/workflows/run-usa-models.yaml
index bf836b8..d7ecb5f 100644
--- a/.github/workflows/run-usa-models.yaml
+++ b/.github/workflows/run-usa-models.yaml
@@ -38,7 +38,7 @@ jobs:
         with:
           name: model-outputs
       - name: Clone fork of variant nowcast hub
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           repository: nextstrain/variant-nowcast-hub
           path: variant-nowcast-hub