diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 4bf061120..449ffcc77 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="0.3.7.0-3"
-export PIKA_PACKAGE_NAME="haskell-scientific"
+export PIKA_PACKAGE_VERSION="3000.2.0.2-6"
+export PIKA_PACKAGE_NAME="haskell-numbers"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"