diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 663e77738..c96660cb1 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="0.1.2.1-2"
-export PIKA_PACKAGE_NAME="haskell-hgmp"
+export PIKA_PACKAGE_VERSION="2.1.0-2"
+export PIKA_PACKAGE_NAME="python-iso8601"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"