diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 8a5686b26..99e190dff 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="0.5.8.3-3"
-export PIKA_PACKAGE_NAME="haskell-cereal"
+export PIKA_PACKAGE_VERSION="0.41.1-2"
+export PIKA_PACKAGE_NAME="phosh"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"