diff --git a/.github/workflows/check-install.yaml b/.github/workflows/check-install.yaml
index 89372a1..c9c31c3 100644
--- a/.github/workflows/check-install.yaml
+++ b/.github/workflows/check-install.yaml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Get latest CMake
       uses: lukka/get-cmake@latest
diff --git a/.github/workflows/create-tag.yaml b/.github/workflows/create-tag.yaml
index 4a3d3be..b30585d 100644
--- a/.github/workflows/create-tag.yaml
+++ b/.github/workflows/create-tag.yaml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     if: ${{ github.event.workflow_run.conclusion == 'success' }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Get current version
       id: current
diff --git a/.github/workflows/doxygenate.yaml b/.github/workflows/doxygenate.yaml
index 128131b..2f088cc 100644
--- a/.github/workflows/doxygenate.yaml
+++ b/.github/workflows/doxygenate.yaml
@@ -9,7 +9,7 @@ jobs:
   docs:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Add Pretty CSS
       uses: wei/wget@v1
diff --git a/.github/workflows/run-tests.yaml b/.github/workflows/run-tests.yaml
index d1352b8..6847747 100644
--- a/.github/workflows/run-tests.yaml
+++ b/.github/workflows/run-tests.yaml
@@ -25,7 +25,7 @@ jobs:
           }
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Get latest CMake
       uses: lukka/get-cmake@latest
@@ -54,6 +54,8 @@ jobs:
 
     - name: Upload to Codecov
       if: ${{ matrix.config.cov }}
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v5
       with:
         directory: build/tests/CMakeFiles/
+      env:
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
diff --git a/README.md b/README.md
index 9830cb0..e609b79 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 ![Unit tests](https://github.com/tatami-inc/tatami_layered/actions/workflows/run-tests.yaml/badge.svg)
 ![Documentation](https://github.com/tatami-inc/tatami_layered/actions/workflows/doxygenate.yaml/badge.svg)
-[![Codecov](https://codecov.io/gh/tatami-inc/tatami_layered/branch/master/graph/badge.svg)](https://codecov.io/gh/tatami-inc/tatami_layered)
+[![codecov](https://codecov.io/gh/tatami-inc/tatami_layered/graph/badge.svg?token=I5w28POARD)](https://codecov.io/gh/tatami-inc/tatami_layered)
 
 ## Overview