diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index bbf20a338..8d86a6659 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="0.6.6+dfsg-2"
-export PIKA_PACKAGE_NAME="python-pycosat"
+export PIKA_PACKAGE_VERSION="9.3.1.22-3"
+export PIKA_PACKAGE_NAME="haskell-hxt"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"