diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index c3506581e..a89d26693 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="0.33.0-2"
-export PIKA_PACKAGE_NAME="ppxlib"
+export PIKA_PACKAGE_VERSION="2.34.0-3"
+export PIKA_PACKAGE_NAME="swift"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"