diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index e182f5243..79b17b4b5 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="4.0.1-4"
-export PIKA_PACKAGE_NAME="mpi4py"
+export PIKA_PACKAGE_VERSION="1:20241115-1"
+export PIKA_PACKAGE_NAME="chirp"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"