diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b081aa1..3451a3b 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -4,7 +4,7 @@ jobs:
   build-HyperC:
     runs-on: docker
     container:
-      image: niteo/nixpkgs-nixos-unstable
+      image: niteo/nixpkgs-nixos-unstable:9e70e9f732fbb15872cb4ea11bd43c14328a0b69
     name: Build NixOS Iso
     steps:
       - name: Update Nix Store