diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index abbe6d8e2..e2754e258 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="3.4.3-1"
-export PIKA_PACKAGE_NAME="python-xmlschema"
+export PIKA_PACKAGE_VERSION="1.17.1-2"
+export PIKA_PACKAGE_NAME="python-cffi"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"