diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 29f454f18..d03141f5b 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="2.0.5.0+ds1-1"
-export PIKA_PACKAGE_NAME="haskell-double-conversion"
+export PIKA_PACKAGE_VERSION="1.10.21-1"
+export PIKA_PACKAGE_NAME="haskell-concurrent-output"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"