diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index f8b1c9662..7d772ea3e 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="2.2.7.3-1"
-export PIKA_PACKAGE_NAME="ruby-rdiscount"
+export PIKA_PACKAGE_VERSION="1.21.3+dfsg-1"
+export PIKA_PACKAGE_NAME="ruby-rbpdf"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"