diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 0c78dc220..a45affb18 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="2.4-23-1"
-export PIKA_PACKAGE_NAME="r-cran-tgp"
+export PIKA_PACKAGE_VERSION="2.3-4-1"
+export PIKA_PACKAGE_NAME="r-cran-prabclus"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"