diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 5ae4b4567..c4706d12b 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,6 +1,6 @@
-export PIKA_PACKAGE_VERSION="1.2.0-1"
-export PIKA_PACKAGE_NAME="python-async-interrupt"
+export PIKA_PACKAGE_VERSION="4.2.0-11"
+export PIKA_PACKAGE_NAME="mpich"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
-export PIKA_REBUILD_VERSION="b0"
-export PIKA_BUILD_ATTEMPT="0"
\ No newline at end of file
+export PIKA_REBUILD_VERSION="b3"
+export PIKA_BUILD_ATTEMPT="3"
\ No newline at end of file