diff --git a/package.json b/package.json
index 6b3cf7e..0e20d31 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,7 @@
     "@aureooms/js-compare": "^1.4.5",
     "@aureooms/js-functools": "^2.0.3",
     "@aureooms/js-in-situ-sort-spec": "^7.0.2",
-    "@aureooms/js-itertools": "^3.1.1",
+    "@aureooms/js-itertools": "^3.2.1",
     "@aureooms/js-random": "^2.0.0",
     "@aureooms/js-search": "^0.0.4",
     "ava": "^0.19.1",