diff --git a/packages/art/lotte/updater.nix b/packages/art/lotte/updater.nix
index 3b3182eb..73d5c4f4 100644
--- a/packages/art/lotte/updater.nix
+++ b/packages/art/lotte/updater.nix
@@ -2,14 +2,18 @@
   nix-prefetch-git,
   curl,
   jq,
+  lib,
 }:
+let
+  srcInfo = lib.importJSON ./source.json;
+in
 ''
   echo "lotte-art: Checking for updates"
-  set CURRENT_COMMIT $(${curl}/bin/curl https://git.chir.rs/api/v1/repos/darkkirb/lotte-art/commits | ${jq}/bin/jq -r '.[0].sha')
-  set KNOWN_COMMIT $(${jq}/bin/jq -r '.rev' packages/art/lotte/source.json)
-  if [ $CURRENT_COMMIT != $KNOWN_COMMIT ];
+  CURRENT_COMMIT=$(${curl}/bin/curl https://git.chir.rs/api/v1/repos/darkkirb/lotte-art/commits | ${jq}/bin/jq -r '.[0].sha')
+  KNOWN_COMMIT=${srcInfo.rev}
+  if [ $CURRENT_COMMIT != $KNOWN_COMMIT ]; then
     echo "lotte-art: Updating from $KNOWN_COMMIT to $CURRENT_COMMIT"
     ${nix-prefetch-git}/bin/nix-prefetch-git https://git.chir.rs/darkkirb/lotte-art --fetch-lfs | ${jq}/bin/jq > packages/art/lotte/source.json
-  end
+  fi
   echo "lotte-art: Done"
 ''
diff --git a/packages/updater.nix b/packages/updater.nix
index 443f2898..502e5725 100644
--- a/packages/updater.nix
+++ b/packages/updater.nix
@@ -2,12 +2,13 @@
   lib,
   callPackage,
   writeScriptBin,
-  fish,
+  bash,
 }:
 let
   script = lib.concatMapStringsSep "\n" (f: callPackage "${f}/updater.nix" { }) [ ./art ];
 in
 writeScriptBin "updater" ''
-  #!${fish}/bin/fish
+  #!${bash}/bin/bash
+  set -euxo pipefail
   ${script}
 ''