diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 2ea868c04..2d13085dd 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="0.5.1+dfsg1-3"
-export PIKA_PACKAGE_NAME="python-ws4py"
+export PIKA_PACKAGE_VERSION="1.0.133-1"
+export PIKA_PACKAGE_NAME="rust-serde-json"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"