diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 55a3c334d..35236a72a 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="1:18.1.8-10"
-export PIKA_PACKAGE_NAME="llvm-toolchain-18"
+export PIKA_PACKAGE_VERSION="3.1.15-2"
+export PIKA_PACKAGE_NAME="python-aenum"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"