diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 08a92dab1..0465b8218 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="0.35-1"
-export PIKA_PACKAGE_NAME="libdatetime-format-flexible-perl"
+export PIKA_PACKAGE_VERSION="2.64-12"
+export PIKA_PACKAGE_NAME="ssmtp"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"