diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 35bc26838..b2b7c40f1 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="1.15.0-2"
-export PIKA_PACKAGE_NAME="iredis"
+export PIKA_PACKAGE_VERSION="1:19.1.0~++20240724103243+7af27be6633a-1~exp1"
+export PIKA_PACKAGE_NAME="llvm-toolchain-19"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"