diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index f18bac14a..2d69033c6 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="2.20.1+ds-18"
-export PIKA_PACKAGE_NAME="fakechroot"
+export PIKA_PACKAGE_VERSION="4.31-1"
+export PIKA_PACKAGE_NAME="libmath-mpfr-perl"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"