diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index e1c2ee5b6..482604a75 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="1.14-2"
-export PIKA_PACKAGE_NAME="clzip"
+export PIKA_PACKAGE_VERSION="1.23-1"
+export PIKA_PACKAGE_NAME="harp"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"