diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index bae8eb21f..ac23a0148 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="2.6.0-1"
-export PIKA_PACKAGE_NAME="pydantic-settings"
+export PIKA_PACKAGE_VERSION="1.8.1-4"
+export PIKA_PACKAGE_NAME="pkgconf"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"