diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 98fb358ce..1d7b11860 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="0.3.37-1"
-export PIKA_PACKAGE_NAME="rust-time"
+export PIKA_PACKAGE_VERSION="2.21.1-1"
+export PIKA_PACKAGE_NAME="python-fastjsonschema"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"