diff --git a/examples/runtime-stack/go.mod b/examples/runtime-stack/go.mod
index a5cc82a..45ea463 100644
--- a/examples/runtime-stack/go.mod
+++ b/examples/runtime-stack/go.mod
@@ -1,3 +1,5 @@
 module github.com/felixge/go-profiler-notes/examples/runtime-stack
 
 go 1.16
+
+toolchain go1.26.0