diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 14b30734a..4fbb10898 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="20241025"
-export PIKA_PACKAGE_NAME="hamradio-files"
+export PIKA_PACKAGE_VERSION="10.1.1+ds1-4"
+export PIKA_PACKAGE_NAME="fmtlib"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"