diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 9ede6e0c9..e182f5243 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="0.18.4+dfsg-1"
-export PIKA_PACKAGE_NAME="xonsh"
+export PIKA_PACKAGE_VERSION="4.0.1-4"
+export PIKA_PACKAGE_NAME="mpi4py"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"