diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index ea6617eca..e0c6581d2 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="0.5.1-4"
-export PIKA_PACKAGE_NAME="ocplib-simplex"
+export PIKA_PACKAGE_VERSION="3.3-2"
+export PIKA_PACKAGE_NAME="ocaml-sedlex"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"