diff --git a/scripts/requirements-dev.txt b/scripts/requirements-dev.txt
index af3e9f5..7fb88ed 100644
--- a/scripts/requirements-dev.txt
+++ b/scripts/requirements-dev.txt
@@ -1,5 +1,5 @@
 # Pinned dependencies for scripts/gen_testdata.py (regenerating test fixtures).
 # Versions current as of 2026-06.
-onnx==1.21.0
+onnx==1.22.0
 numpy==2.4.6
 tokenizers==0.23.1