diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 3624a36de..6f924e5f0 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="3.7.0-1"
-export PIKA_PACKAGE_NAME="golang-github-willf-bloom"
+export PIKA_PACKAGE_VERSION="0.18.6-1"
+export PIKA_PACKAGE_NAME="python-msgspec"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"