diff --git a/package.json b/package.json
index 2576a10..159155d 100644
--- a/package.json
+++ b/package.json
@@ -80,7 +80,7 @@
   "devDependencies": {
     "@aureooms/js-compare": "1.4.8",
     "@aureooms/js-functools": "2.0.3",
-    "@aureooms/js-itertools": "5.0.1",
+    "@aureooms/js-itertools": "5.1.0",
     "@aureooms/js-random": "2.0.0",
     "@babel/cli": "7.13.10",
     "@babel/core": "7.13.10",
diff --git a/yarn.lock b/yarn.lock
index 9d90033..01d47e8 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -24,10 +24,10 @@
   resolved "https://registry.yarnpkg.com/@aureooms/js-functools/-/js-functools-2.0.3.tgz#5139d6245278193da4cf21c44666797bf40a1d6e"
   integrity sha1-UTnWJFJ4GT2kzyHERmZ5e/QKHW4=
 
-"@aureooms/js-itertools@5.0.1":
-  version "5.0.1"
-  resolved "https://registry.yarnpkg.com/@aureooms/js-itertools/-/js-itertools-5.0.1.tgz#73af47b0a710073730fccde6c57431a9178d1bea"
-  integrity sha512-EBmA0EiY49MSu7M6eCZvUyEhV79bvIQDg/LL3bfUG8fxhL4IeBLbgYc41a4/LunD5mLFG8ZQna/Z/oUjr4fUuQ==
+"@aureooms/js-itertools@5.1.0":
+  version "5.1.0"
+  resolved "https://registry.yarnpkg.com/@aureooms/js-itertools/-/js-itertools-5.1.0.tgz#bb90a237baab78eeaef177376ac762fc43b9d485"
+  integrity sha512-HC5Rl89Vc99lcp2HBtZVYpmr1Esjm4gDyBD4V8ATNB5zBMtJ2+Jd145UsvgIqHPg7z4RbX1G0XNW6pM4rB6Uuw==
   dependencies:
     "@aureooms/js-collections-deque" "^6.0.1"
     "@aureooms/js-error" "^5.0.2"