diff --git a/.changeset/no-iterator-concat.md b/.changeset/no-iterator-concat.md
new file mode 100644
index 00000000..8480fbe7
--- /dev/null
+++ b/.changeset/no-iterator-concat.md
@@ -0,0 +1,5 @@
+---
+"eslint-plugin-es-x": minor
+---
+
+Add `es-x/no-iterator-concat` rule
diff --git a/docs/rules/index.md b/docs/rules/index.md
index e41eb3c4..06ef6060 100644
--- a/docs/rules/index.md
+++ b/docs/rules/index.md
@@ -14,6 +14,7 @@ There is a config that enables the rules in this category: [`no-new-in-esnext`]
 | [es-x/no-asyncdisposablestack](./no-asyncdisposablestack.md) | disallow the `AsyncDisposableStack` class. |  |
 | [es-x/no-disposablestack](./no-disposablestack.md) | disallow the `DisposableStack` class. |  |
 | [es-x/no-error-iserror](./no-error-iserror.md) | disallow the `Error.isError` method. |  |
+| [es-x/no-iterator-concat](./no-iterator-concat.md) | disallow the `Iterator.concat` method. |  |
 | [es-x/no-math-sumprecise](./no-math-sumprecise.md) | disallow the `Math.sumPrecise` method. |  |
 | [es-x/no-suppressederror](./no-suppressederror.md) | disallow the `SuppressedError` class. |  |
 | [es-x/no-symbol-asyncdispose](./no-symbol-asyncdispose.md) | disallow the `Symbol.asyncDispose` property. |  |
diff --git a/docs/rules/no-iterator-concat.md b/docs/rules/no-iterator-concat.md
new file mode 100644
index 00000000..5ce34a18
--- /dev/null
+++ b/docs/rules/no-iterator-concat.md
@@ -0,0 +1,54 @@
+---
+title: "es-x/no-iterator-concat"
+description: "disallow the `Iterator.concat` method"
+---
+
+# es-x/no-iterator-concat
+> disallow the `Iterator.concat` method
+
+- ❗ <badge text="This rule has not been released yet." vertical="middle" type="error"> ***This rule has not been released yet.*** </badge>
+- ✅ The following configurations enable this rule: [no-new-in-esnext]
+
+This rule reports ES2026 [`Iterator.concat` method](https://github.com/tc39/proposal-iterator-sequencing) as errors.
+
+## 💡 Examples
+
+⛔ Examples of **incorrect** code for this rule:
+
+<eslint-playground type="bad">
+
+```js
+/*eslint es-x/no-iterator-concat: error */
+Iterator.concat();
+```
+
+</eslint-playground>
+
+## 🔧 Options
+
+This rule has an option.
+
+```jsonc
+{
+  "rules": {
+    "es-x/no-iterator-concat": [
+      "error",
+      {
+        "allowTestedProperty": false
+      }
+    ]
+  }
+}
+```
+
+### allowTestedProperty: boolean
+
+Configure the allowTestedProperty mode for only this rule.
+This is prior to the `settings['es-x'].allowTestedProperty` setting.
+
+## 📚 References
+
+- [Rule source](https://github.com/eslint-community/eslint-plugin-es-x/blob/master/lib/rules/no-iterator-concat.js)
+- [Test source](https://github.com/eslint-community/eslint-plugin-es-x/blob/master/tests/lib/rules/no-iterator-concat.js)
+
+[no-new-in-esnext]: ../configs/index.md#no-new-in-esnext
diff --git a/lib/configs/flat/no-new-in-esnext.js b/lib/configs/flat/no-new-in-esnext.js
index 83add688..5c815d87 100644
--- a/lib/configs/flat/no-new-in-esnext.js
+++ b/lib/configs/flat/no-new-in-esnext.js
@@ -15,6 +15,7 @@ module.exports = {
         "es-x/no-asyncdisposablestack": "error",
         "es-x/no-disposablestack": "error",
         "es-x/no-error-iserror": "error",
+        "es-x/no-iterator-concat": "error",
         "es-x/no-math-sumprecise": "error",
         "es-x/no-suppressederror": "error",
         "es-x/no-symbol-asyncdispose": "error",
diff --git a/lib/configs/no-new-in-esnext.js b/lib/configs/no-new-in-esnext.js
index 95318be3..24278c1e 100644
--- a/lib/configs/no-new-in-esnext.js
+++ b/lib/configs/no-new-in-esnext.js
@@ -11,6 +11,7 @@ module.exports = {
         "es-x/no-asyncdisposablestack": "error",
         "es-x/no-disposablestack": "error",
         "es-x/no-error-iserror": "error",
+        "es-x/no-iterator-concat": "error",
         "es-x/no-math-sumprecise": "error",
         "es-x/no-suppressederror": "error",
         "es-x/no-symbol-asyncdispose": "error",
diff --git a/lib/index.js b/lib/index.js
index 6b97d1b6..d8f22660 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -248,6 +248,7 @@ module.exports = {
         "no-intl-segmenter": require("./rules/no-intl-segmenter"),
         "no-intl-supportedvaluesof": require("./rules/no-intl-supportedvaluesof"),
         "no-iterator": require("./rules/no-iterator"),
+        "no-iterator-concat": require("./rules/no-iterator-concat"),
         "no-iterator-prototype-drop": require("./rules/no-iterator-prototype-drop"),
         "no-iterator-prototype-every": require("./rules/no-iterator-prototype-every"),
         "no-iterator-prototype-filter": require("./rules/no-iterator-prototype-filter"),
diff --git a/lib/rules/no-iterator-concat.js b/lib/rules/no-iterator-concat.js
new file mode 100644
index 00000000..4ec3f849
--- /dev/null
+++ b/lib/rules/no-iterator-concat.js
@@ -0,0 +1,35 @@
+"use strict"
+
+const {
+    defineStaticPropertiesHandler,
+} = require("../util/define-static-properties-handler")
+
+module.exports = {
+    meta: {
+        docs: {
+            description: "disallow the `Iterator.concat` method",
+            category: "ES2026",
+            recommended: false,
+            url: "http://eslint-community.github.io/eslint-plugin-es-x/rules/no-iterator-concat.html",
+        },
+        fixable: null,
+        messages: {
+            forbidden: "ES2026 '{{name}}' method is forbidden.",
+        },
+        schema: [
+            {
+                type: "object",
+                properties: {
+                    allowTestedProperty: { type: "boolean" },
+                },
+                additionalProperties: false,
+            },
+        ],
+        type: "problem",
+    },
+    create(context) {
+        return defineStaticPropertiesHandler(context, {
+            Iterator: { concat: "function" },
+        })
+    },
+}
diff --git a/lib/util/well-known-properties.js b/lib/util/well-known-properties.js
index 68838e03..73463ea0 100644
--- a/lib/util/well-known-properties.js
+++ b/lib/util/well-known-properties.js
@@ -868,6 +868,7 @@ const iteratorProperties = new Set([
     ...functionPrototypeProperties,
 
     // https://tc39.es/ecma262/multipage/control-abstraction-objects.html#sec-properties-of-the-iterator-constructor
+    "concat",
     "from",
     "prototype",
 ])
diff --git a/scripts/update-docs-rules.js b/scripts/update-docs-rules.js
index 624490b5..45363642 100644
--- a/scripts/update-docs-rules.js
+++ b/scripts/update-docs-rules.js
@@ -67,7 +67,7 @@ async function main() {
         const since = getSince(originalContent)
 
         let content = originalContent
-            .replace(/^\n*(?:---[\s\S]*?---\n\n?)?#.+\n>.+\n+(?:- .+\n)*/u, "")
+            .replace(/^\n*(?:---[\s\S]*?---\n\n?)?#.+\n>.*\n+(?:- .+\n)*/u, "")
             .replace(/## 🚀 Version[\s\S]+/u, "")
             .replace(/## 📚 References[\s\S]+/u, "")
             .trim()
diff --git a/tests/lib/rules/no-iterator-concat.js b/tests/lib/rules/no-iterator-concat.js
new file mode 100644
index 00000000..c26a1757
--- /dev/null
+++ b/tests/lib/rules/no-iterator-concat.js
@@ -0,0 +1,14 @@
+"use strict"
+
+const RuleTester = require("../../tester")
+const rule = require("../../../lib/rules/no-iterator-concat.js")
+
+new RuleTester().run("no-iterator-concat", rule, {
+    valid: ["Iterator", "Iterator.length", "let Iterator = 0; Iterator.concat"],
+    invalid: [
+        {
+            code: "Iterator.concat",
+            errors: ["ES2026 'Iterator.concat' method is forbidden."],
+        },
+    ],
+})