diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index ef4723097..42b129d39 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="5.29-1"
-export PIKA_PACKAGE_NAME="liburi-perl"
+export PIKA_PACKAGE_VERSION="2.18.3+ds-1"
+export PIKA_PACKAGE_NAME="zarr"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"