diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 0465b8218..b2e3e8a12 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="2.64-12"
-export PIKA_PACKAGE_NAME="ssmtp"
+export PIKA_PACKAGE_VERSION="1:2.63-2+2024b"
+export PIKA_PACKAGE_NAME="libdatetime-timezone-perl"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"