diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index adb3660b7..5e7a3b0ce 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="3.1.1-5"
-export PIKA_PACKAGE_NAME="python-pycadf"
+export PIKA_PACKAGE_VERSION="2.27.2-1"
+export PIKA_PACKAGE_NAME="pydantic-core"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"