diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 14fed05cb..87e1063eb 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="5.15.15-1"
-export PIKA_PACKAGE_NAME="qtgraphicaleffects-opensource-src"
+export PIKA_PACKAGE_VERSION="0.42-1"
+export PIKA_PACKAGE_NAME="python-gnuplotlib"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"