diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index fd5af17cf..42926df3e 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="1.2-22-1"
-export PIKA_PACKAGE_NAME="r-cran-partykit"
+export PIKA_PACKAGE_VERSION="0.6.1-2"
+export PIKA_PACKAGE_NAME="rust-pep508-rs"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"