diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 32fa0c43e..3e0cbf553 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="0.9.0-3"
-export PIKA_PACKAGE_NAME="libm2k"
+export PIKA_PACKAGE_VERSION="0.20.0-2"
+export PIKA_PACKAGE_NAME="pyrsistent"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"