diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index bfdd9ea64..4df2a6814 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="0.1.5-2"
-export PIKA_PACKAGE_NAME="rust-smtp-proto"
+export PIKA_PACKAGE_VERSION="1.5.3.1-1"
+export PIKA_PACKAGE_NAME="haskell-rank2classes"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"