diff --git a/installer/install.sh b/installer/install.sh
index 44d51cf..ed89467 100644
--- a/installer/install.sh
+++ b/installer/install.sh
@@ -50,7 +50,7 @@ case "$CHOICE" in
     # --- Branche flotte : rien d'autre à saisir -----------------------
     echo
     echo "Installation du profil générique 'usagers' sur $DEVICE..."
-    nix run 'github:nix-community/disko#disko-install' -- --write-efi-boot-entries \
+    nix run --no-write-lock-file --refresh 'github:nix-community/disko#disko-install' -- --write-efi-boot-entries \
       --flake "${FLEET_REPO}#usagers" \
       --disk main "$DEVICE"
     ;;
@@ -85,7 +85,7 @@ case "$CHOICE" in
     if [[ "$ATTR" == *-luks ]]; then
       echo "Disque chiffré : disko va demander une passphrase LUKS pendant le partitionnement."
     fi
-    nix run 'github:nix-community/disko#disko-install' -- --write-efi-boot-entries \
+    nix run --no-write-lock-file --refresh 'github:nix-community/disko#disko-install' -- --write-efi-boot-entries \
       --flake "${AUTHED_URL}#${ATTR}" \
       --disk main "$DEVICE"