diff --git a/.github/workflows/build-system.yml b/.github/workflows/build-system.yml
index 795e143..e60310d 100644
--- a/.github/workflows/build-system.yml
+++ b/.github/workflows/build-system.yml
@@ -5,7 +5,7 @@ on:
 
 jobs:
   build-x86_64-demeter:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     permissions:
       contents: read
       id-token: write
@@ -23,7 +23,7 @@ jobs:
           # nix flake check --all-systems
           nix build .#nixosConfigurations.demeter.config.system.build.toplevel
   build-aarch64-callisto:
-    runs-on: ubuntu-latest-arm
+    runs-on: ubuntu-24.04-arm
     permissions:
       contents: read
       id-token: write