diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 57a88cd09..5181fa00b 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="2024.1.1-6"
-export PIKA_PACKAGE_NAME="pynx"
+export PIKA_PACKAGE_VERSION="4.1.0-2"
+export PIKA_PACKAGE_NAME="python-phx-class-registry"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"