diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 59a9967a9..ca97ab8d7 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="3.4.2-3"
-export PIKA_PACKAGE_NAME="python-calmjs"
+export PIKA_PACKAGE_VERSION="2.5.3-1"
+export PIKA_PACKAGE_NAME="python-socks"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"