diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 5b5ccc760..585091d30 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="0.6.2.0-5"
-export PIKA_PACKAGE_NAME="haskell-quickcheck-classes-base"
+export PIKA_PACKAGE_VERSION="3.8-2"
+export PIKA_PACKAGE_NAME="python-idna"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"