diff --git a/package.json b/package.json
index a280a1c..271edcd 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
     "@aureooms/js-heapq": "^3.1.0"
   },
   "devDependencies": {
-    "@aureooms/js-itertools": "4.1.0",
+    "@aureooms/js-itertools": "5.0.0",
     "@babel/cli": "7.13.10",
     "@babel/core": "7.13.10",
     "@babel/polyfill": "7.12.1",
diff --git a/yarn.lock b/yarn.lock
index bd7898f..7f2f017 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -9,12 +9,12 @@
   dependencies:
     "@aureooms/js-error" "^3.0.0"
 
-"@aureooms/js-collections-deque@^4.0.1":
-  version "4.0.1"
-  resolved "https://registry.yarnpkg.com/@aureooms/js-collections-deque/-/js-collections-deque-4.0.1.tgz#bd8b827cdb597d061525c380dd704e338c77bd5f"
-  integrity sha512-dktRVLyep0sUKpqgtG/JseA232KMdlu9t9ePq2wHcng1dZ3+63qW2C+FlKXBktrT1dU92DDxIL6PqnV97kHA1Q==
+"@aureooms/js-collections-deque@^5.0.0":
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/@aureooms/js-collections-deque/-/js-collections-deque-5.0.0.tgz#a574ddc2e53d8e073573f914cec9b130cf5355a8"
+  integrity sha512-28zJhpXGE4D0hQkaZFDYaeA/maUKTTcoHaScbBBzHCu5iy/+sovU7MnSm4URC0EN+R8AH/uVsSS0CFjDMXo6SQ==
   dependencies:
-    "@aureooms/js-error" "^4.0.1"
+    "@aureooms/js-error" "^5.0.1"
 
 "@aureooms/js-collections-dict@^4.0.0":
   version "4.0.0"
@@ -39,16 +39,16 @@
   resolved "https://registry.yarnpkg.com/@aureooms/js-error/-/js-error-4.0.0.tgz#cea0a145f5290f443911b3d1890d7254a18eeb9b"
   integrity sha512-omwmz82cPxqRnorZ8tqeIcPj1QcJnCsMiVYcwOh/QfUXhJ+DmiBPgWOm5WWAQvQzYVKe0/k7+s2ie+UoRJagjA==
 
-"@aureooms/js-error@^4.0.1":
-  version "4.0.1"
-  resolved "https://registry.yarnpkg.com/@aureooms/js-error/-/js-error-4.0.1.tgz#be2740b3f31a337e0828930c9b70d38113b4dd77"
-  integrity sha512-zsgs6wmnRsKljlusewYiBaFBM/hIJp43b7OwE9ybpLEL4wfXjGP17cJTTAY8gpzALVFwEA5/flxIK0I6gJJLHQ==
-
 "@aureooms/js-error@^5.0.0":
   version "5.0.1"
   resolved "https://registry.yarnpkg.com/@aureooms/js-error/-/js-error-5.0.1.tgz#474e2f1dd7189f97df770b5cc6f1bda536de262d"
   integrity sha512-BbbpKpp4W8L2x9vL4bas+JtuAe4PMojzTpf21puHPw5p3S+lgKd8SfS9y40pVHi/b3SrQrdpmsaEKjL4xviilQ==
 
+"@aureooms/js-error@^5.0.1":
+  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-heapq@^3.1.0":
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/@aureooms/js-heapq/-/js-heapq-3.1.0.tgz#4f5dfbdacd6f726a69a56569d8b2c97b19ace0e9"
@@ -58,13 +58,13 @@
     "@aureooms/js-error" "^3.0.0"
     "@aureooms/js-itertools" "^3.1.1"
 
-"@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==
+"@aureooms/js-itertools@5.0.0":
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/@aureooms/js-itertools/-/js-itertools-5.0.0.tgz#f0f4e27381b8533ddeb9db7c8f4f05da0522cddd"
+  integrity sha512-LAULGvyCvMjD+V0J4m7PS2QITeG/j3KUxDlSM5rOR7sh0eWZU3jiRMi8H0aBpKhwiVV6AEjXBsMmo3EmhPlJrQ==
   dependencies:
-    "@aureooms/js-collections-deque" "^4.0.1"
-    "@aureooms/js-error" "^4.0.1"
+    "@aureooms/js-collections-deque" "^5.0.0"
+    "@aureooms/js-error" "^5.0.1"
 
 "@aureooms/js-itertools@^3.1.1":
   version "3.4.0"