diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index bcdd46e05..ae2d885d3 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="0.2.1-3"
-export PIKA_PACKAGE_NAME="haskell-multipart"
+export PIKA_PACKAGE_VERSION="0.4.0.1-8"
+export PIKA_PACKAGE_NAME="haskell-string-conversions"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"