diff --git a/package.json b/package.json
index 9e2c293..6648770 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
     "@aureooms/js-heapq": "^3.1.0"
   },
   "devDependencies": {
-    "@aureooms/js-itertools": "4.0.1",
+    "@aureooms/js-itertools": "4.1.0",
     "@babel/cli": "7.10.5",
     "@babel/core": "7.11.1",
     "@babel/polyfill": "7.10.4",
diff --git a/yarn.lock b/yarn.lock
index 94765b0..2fa8890 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -53,10 +53,10 @@
     "@aureooms/js-error" "^3.0.0"
     "@aureooms/js-itertools" "^3.1.1"
 
-"@aureooms/js-itertools@4.0.1":
-  version "4.0.1"
-  resolved "https://registry.yarnpkg.com/@aureooms/js-itertools/-/js-itertools-4.0.1.tgz#6968eb71456daa042af0b8682100d59f397f7f91"
-  integrity sha512-cNaSF+5bgRGUXWBlWzSLjo0t12MHmkr1qCIxCvB4d3D5C7GPG0SH35efMOrv1VkHrLXuTqAbdnNu/iy2i26w5w==
+"@aureooms/js-itertools@4.1.0":
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/@aureooms/js-itertools/-/js-itertools-4.1.0.tgz#c731eaee7de0005c6ea41f2f87cca4bdb2d86ca1"
+  integrity sha512-P9TfwQPuXk5T5z6QMMfwLLyzh9QsEu4sGWcBk/P/waWgim/xqr+LDTOHVo7WU4QAty+/5CBX8DuW7MrPVfXt5A==
   dependencies:
     "@aureooms/js-collections-deque" "^4.0.1"
     "@aureooms/js-error" "^4.0.1"