diff --git a/package.json b/package.json
index 587c7d6..95fc16e 100644
--- a/package.json
+++ b/package.json
@@ -81,7 +81,7 @@
     "@aureooms/js-compare": "1.4.8",
     "@aureooms/js-functools": "2.0.3",
     "@aureooms/js-in-situ-sort-spec": "8.0.0",
-    "@aureooms/js-itertools": "4.1.0",
+    "@aureooms/js-itertools": "5.0.1",
     "@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 0e37451..68ab4b0 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -14,6 +14,13 @@
   dependencies:
     "@aureooms/js-error" "^4.0.1"
 
+"@aureooms/js-collections-deque@^6.0.1":
+  version "6.0.1"
+  resolved "https://registry.yarnpkg.com/@aureooms/js-collections-deque/-/js-collections-deque-6.0.1.tgz#ba89379ac826539047f768e1fb84ed4d2c1f829e"
+  integrity sha512-GUhEIF6tmnxsGvUaPSR/7HbZETn04yHOcrt7swo5ftKRz+Pb/N9iuvGimBwmCTLDkJ60OZG2TWfoYPVNA2lutQ==
+  dependencies:
+    "@aureooms/js-error" "^5.0.2"
+
 "@aureooms/js-compare@1.4.8", "@aureooms/js-compare@^1.4.8":
   version "1.4.8"
   resolved "https://registry.yarnpkg.com/@aureooms/js-compare/-/js-compare-1.4.8.tgz#c6bff1091f4a2e211f449299572d9f195146fc59"
@@ -24,6 +31,11 @@
   resolved "https://registry.yarnpkg.com/@aureooms/js-error/-/js-error-4.0.1.tgz#be2740b3f31a337e0828930c9b70d38113b4dd77"
   integrity sha512-zsgs6wmnRsKljlusewYiBaFBM/hIJp43b7OwE9ybpLEL4wfXjGP17cJTTAY8gpzALVFwEA5/flxIK0I6gJJLHQ==
 
+"@aureooms/js-error@^5.0.2":
+  version "5.0.2"
+  resolved "https://registry.yarnpkg.com/@aureooms/js-error/-/js-error-5.0.2.tgz#dc2ad2fc2b10365581c32c28222daccc5c3c9600"
+  integrity sha512-HLO95kmZ1nJV5qo8Xq7czHVskFGPkM3l60JFgdTnpvCH6P6lkyWDBplaDB9gI5cPvcRIZDs1HeAHhAlHR/jBxw==
+
 "@aureooms/js-functools@2.0.3", "@aureooms/js-functools@^2.0.3":
   version "2.0.3"
   resolved "https://registry.yarnpkg.com/@aureooms/js-functools/-/js-functools-2.0.3.tgz#5139d6245278193da4cf21c44666797bf40a1d6e"
@@ -41,7 +53,15 @@
     "@aureooms/js-random" "^2.0.0"
     "@aureooms/js-sort" "^7.0.0"
 
-"@aureooms/js-itertools@4.1.0", "@aureooms/js-itertools@^4.1.0":
+"@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==
+  dependencies:
+    "@aureooms/js-collections-deque" "^6.0.1"
+    "@aureooms/js-error" "^5.0.2"
+
+"@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==