diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 1a0f76d09..535c4c4de 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="3.1.10+ds-1"
-export PIKA_PACKAGE_NAME="free42-nologo"
+export PIKA_PACKAGE_VERSION="4.0.0+dfsg-1"
+export PIKA_PACKAGE_NAME="jsonpickle"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"