diff --git a/flake.lock b/flake.lock
index d07756c15..3a0c3eccd 100644
--- a/flake.lock
+++ b/flake.lock
@@ -115,10 +115,10 @@
     "nixpkgs": {
       "locked": {
         "lastModified": 315532800,
-        "narHash": "sha256-1tUpklZsKzMGI3gjo/dWD+hS8cf+5Jji8TF5Cfz7i3I=",
-        "rev": "08b8f92ac6354983f5382124fef6006cade4a1c1",
+        "narHash": "sha256-yDxtm0PESdgNetiJN5+MFxgubBcLDTiuSjjrJiyvsvM=",
+        "rev": "d7f52a7a640bc54c7bb414cca603835bf8dd4b10",
         "type": "tarball",
-        "url": "https://releases.nixos.org/nixpkgs/nixpkgs-25.11pre862603.08b8f92ac635/nixexprs.tar.xz"
+        "url": "https://releases.nixos.org/nixpkgs/nixpkgs-25.11pre871443.d7f52a7a640b/nixexprs.tar.xz"
       },
       "original": {
         "type": "tarball",
diff --git a/pkgs/clan-cli/clan_lib/machines/hardware.py b/pkgs/clan-cli/clan_lib/machines/hardware.py
index 089627438..889c84bdf 100644
--- a/pkgs/clan-cli/clan_lib/machines/hardware.py
+++ b/pkgs/clan-cli/clan_lib/machines/hardware.py
@@ -119,6 +119,13 @@ def run_machine_hardware_info_init(
     if opts.debug:
         cmd += ["--debug"]
 
+    # REMOVEME when nixos-anywhere > 1.12.0
+    # In 1.12.0 and earlier, nixos-anywhere doesn't pass Nix options when attempting to get substituters
+    # which leads to the installation test failing with the error of not being able to substitute flake-parts
+    # see: https://github.com/nix-community/nixos-anywhere/pull/596
+    if "CLAN_TEST_STORE" in environ:
+        cmd += ["--no-use-machine-substituters"]
+
     # Add nix options to nixos-anywhere
     cmd.extend(opts.machine.flake.nix_options or [])
 
diff --git a/pkgs/clan-cli/clan_lib/machines/install.py b/pkgs/clan-cli/clan_lib/machines/install.py
index 925a83ee4..c40befa2a 100644
--- a/pkgs/clan-cli/clan_lib/machines/install.py
+++ b/pkgs/clan-cli/clan_lib/machines/install.py
@@ -191,6 +191,13 @@ def run_machine_install(opts: InstallOptions, target_host: Remote) -> None:
         if opts.debug:
             cmd.append("--debug")
 
+        # REMOVEME when nixos-anywhere > 1.12.0
+        # In 1.12.0 and earlier, nixos-anywhere doesn't pass Nix options when attempting to get substituters
+        # which leads to the installation test failing with the error of not being able to substitute flake-parts
+        # see: https://github.com/nix-community/nixos-anywhere/pull/596
+        if "CLAN_TEST_STORE" in environ:
+            cmd += ["--no-use-machine-substituters"]
+
         # Add nix options to nixos-anywhere
         cmd.extend(opts.machine.flake.nix_options or [])