diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index e8666310d..c53cc247d 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="1.2.0-2"
-export PIKA_PACKAGE_NAME="ocaml-ptime"
+export PIKA_PACKAGE_VERSION="1.9.0-6"
+export PIKA_PACKAGE_NAME="dipy"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"