diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 068340322..55a3c334d 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="1.0.4-1"
-export PIKA_PACKAGE_NAME="rust-bet"
+export PIKA_PACKAGE_VERSION="1:18.1.8-10"
+export PIKA_PACKAGE_NAME="llvm-toolchain-18"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"