diff --git a/.github/workflows/cachix.yml b/.github/workflows/cachix.yml
index 6bfa385..d2c31e6 100644
--- a/.github/workflows/cachix.yml
+++ b/.github/workflows/cachix.yml
@@ -25,10 +25,10 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
         matrix:
-            kernelVersion: [5.4, 5.10, 5.11]
+            kernelVersion: ["5.4", "5.10", "5.11"]
             sched: [bmq, cfs, cacule, muqss, pds]
             include:
-              - kernelVersion: 5.10
+              - kernelVersion: "5.10"
                 sched: upds
     steps:
       - uses: actions/checkout@v2.3.4