diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index d0c6d87c4..c903c5390 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,4 +1,4 @@
-export PIKA_PACKAGE_VERSION="5.15.13-2"
+export PIKA_PACKAGE_VERSION="5.15.15-2"
 export PIKA_PACKAGE_NAME="qtwebchannel-opensource-src"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=true