diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 7b2552a61..7c30a0ffe 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="1.23.1-3"
-export PIKA_PACKAGE_NAME="golang-1.23"
+export PIKA_PACKAGE_VERSION="1.21.12-1"
+export PIKA_PACKAGE_NAME="golang-1.21"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"