diff --git a/.github/workflows/arch-matrix.yml b/.github/workflows/arch-matrix.yml
index 4ef291b..1a97334 100644
--- a/.github/workflows/arch-matrix.yml
+++ b/.github/workflows/arch-matrix.yml
@@ -116,7 +116,7 @@ jobs:
       - uses: actions/checkout@v5
       - name: Cache /opt/adaptivecpp
         id: cache-adaptivecpp
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: /opt/adaptivecpp
           # Key components — invalidate the cache when any of these change: