diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 6c2218783..84af16b31 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="0.9.6+ds-1"
-export PIKA_PACKAGE_NAME="gxkb"
+export PIKA_PACKAGE_VERSION="6.1-1"
+export PIKA_PACKAGE_NAME="zope.proxy"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"