diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 707ca7837..846cafec2 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="1.004008-1"
-export PIKA_PACKAGE_NAME="libjson-maybexs-perl"
+export PIKA_PACKAGE_VERSION="1.09-1"
+export PIKA_PACKAGE_NAME="rt-extension-mergeusers"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"