diff --git a/.github/workflows/test_cylc.yml b/.github/workflows/test_cylc.yml
index 43082b0..11284d3 100644
--- a/.github/workflows/test_cylc.yml
+++ b/.github/workflows/test_cylc.yml
@@ -19,7 +19,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup Mamba
         if: ${{ matrix.micromamba_installed }} == true