diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 80e59f430..d735745bf 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="5.13.1+ds-1"
-export PIKA_PACKAGE_NAME="python-tatsu"
+export PIKA_PACKAGE_VERSION="1.5.9-1"
+export PIKA_PACKAGE_NAME="ruby-pkg-config"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"