diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index bab9eaeec..f49f1be90 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="1.2-5"
-export PIKA_PACKAGE_NAME="mustang-plug"
+export PIKA_PACKAGE_VERSION="4.39-1"
+export PIKA_PACKAGE_NAME="libcpanel-json-xs-perl"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"