diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 9f883d5d5..d7a53d05b 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="0.6.1-18"
-export PIKA_PACKAGE_NAME="gauche-c-wrapper"
+export PIKA_PACKAGE_VERSION="1.0.5-2"
+export PIKA_PACKAGE_NAME="python-juliandate"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"