diff --git a/src/parser/expr.js b/src/parser/expr.js
index 3d73a15f..fd7bf1e4 100644
--- a/src/parser/expr.js
+++ b/src/parser/expr.js
@@ -763,7 +763,11 @@ module.exports = {
       return result(newExp, args);
     }
     const attrs = this.read_attr_list();
-    if (this.token === this.tok.T_CLASS) {
+    const isReadonly = this.token === this.tok.T_READ_ONLY;
+    if (
+      this.token === this.tok.T_CLASS ||
+      (isReadonly && this.next().token === this.tok.T_CLASS)
+    ) {
       const what = this.node("class");
       // Annonymous class declaration
       if (this.next().token === "(") {
@@ -775,7 +779,12 @@ module.exports = {
       if (this.expect("{")) {
         body = this.next().read_class_body(true, false);
       }
-      const whatNode = what(null, propExtends, propImplements, body, [0, 0, 0]);
+      const whatNode = what(null, propExtends, propImplements, body, [
+        0,
+        0,
+        0,
+        isReadonly ? 1 : 0,
+      ]);
       whatNode.attrGroups = attrs;
       return result(whatNode, args);
     }
diff --git a/test/snapshot/__snapshots__/new.test.js.snap b/test/snapshot/__snapshots__/new.test.js.snap
index 58d7c35f..e611538c 100644
--- a/test/snapshot/__snapshots__/new.test.js.snap
+++ b/test/snapshot/__snapshots__/new.test.js.snap
@@ -1,4 +1,4 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
+// Jest Snapshot v1, https://jestjs.io/docs/snapshot-testing
 
 exports[`new #348 - byref usage deprecated 1`] = `
 Program {
@@ -226,6 +226,140 @@ Program {
 }
 `;
 
+exports[`new anonymous readonly 1`] = `
+Program {
+  "children": [
+    ExpressionStatement {
+      "expression": New {
+        "arguments": [],
+        "kind": "new",
+        "what": Class {
+          "attrGroups": [],
+          "body": [],
+          "extends": null,
+          "implements": null,
+          "isAbstract": false,
+          "isAnonymous": true,
+          "isFinal": false,
+          "isReadonly": true,
+          "kind": "class",
+          "name": null,
+        },
+      },
+      "kind": "expressionstatement",
+    },
+  ],
+  "errors": [],
+  "kind": "program",
+}
+`;
+
+exports[`new anonymous readonly no parens 1`] = `
+Program {
+  "children": [
+    ExpressionStatement {
+      "expression": New {
+        "arguments": [],
+        "kind": "new",
+        "what": Class {
+          "attrGroups": [],
+          "body": [],
+          "extends": null,
+          "implements": null,
+          "isAbstract": false,
+          "isAnonymous": true,
+          "isFinal": false,
+          "isReadonly": true,
+          "kind": "class",
+          "name": null,
+        },
+      },
+      "kind": "expressionstatement",
+    },
+  ],
+  "errors": [],
+  "kind": "program",
+}
+`;
+
+exports[`new anonymous readonly with argument 1`] = `
+Program {
+  "children": [
+    ExpressionStatement {
+      "expression": New {
+        "arguments": [
+          Variable {
+            "curly": false,
+            "kind": "variable",
+            "name": "var",
+          },
+        ],
+        "kind": "new",
+        "what": Class {
+          "attrGroups": [],
+          "body": [],
+          "extends": null,
+          "implements": null,
+          "isAbstract": false,
+          "isAnonymous": true,
+          "isFinal": false,
+          "isReadonly": true,
+          "kind": "class",
+          "name": null,
+        },
+      },
+      "kind": "expressionstatement",
+    },
+  ],
+  "errors": [],
+  "kind": "program",
+}
+`;
+
+exports[`new anonymous readonly with multiple argument 1`] = `
+Program {
+  "children": [
+    ExpressionStatement {
+      "expression": New {
+        "arguments": [
+          Variable {
+            "curly": false,
+            "kind": "variable",
+            "name": "one",
+          },
+          Variable {
+            "curly": false,
+            "kind": "variable",
+            "name": "two",
+          },
+          Variable {
+            "curly": false,
+            "kind": "variable",
+            "name": "three",
+          },
+        ],
+        "kind": "new",
+        "what": Class {
+          "attrGroups": [],
+          "body": [],
+          "extends": null,
+          "implements": null,
+          "isAbstract": false,
+          "isAnonymous": true,
+          "isFinal": false,
+          "isReadonly": true,
+          "kind": "class",
+          "name": null,
+        },
+      },
+      "kind": "expressionstatement",
+    },
+  ],
+  "errors": [],
+  "kind": "program",
+}
+`;
+
 exports[`new anonymous with argument 1`] = `
 Program {
   "children": [
diff --git a/test/snapshot/new.test.js b/test/snapshot/new.test.js
index db340d95..6839c6cb 100644
--- a/test/snapshot/new.test.js
+++ b/test/snapshot/new.test.js
@@ -42,6 +42,20 @@ describe("new", function () {
       parser.parseEval("new class($one, $two, $three) {};"),
     ).toMatchSnapshot();
   });
+  it("anonymous readonly", function () {
+    expect(parser.parseEval("new readonly class() {};")).toMatchSnapshot();
+  });
+  it("anonymous readonly no parens", function () {
+    expect(parser.parseEval("new readonly class {};")).toMatchSnapshot();
+  });
+  it("anonymous readonly with argument", function () {
+    expect(parser.parseEval("new readonly class($var) {};")).toMatchSnapshot();
+  });
+  it("anonymous readonly with multiple argument", function () {
+    expect(
+      parser.parseEval("new readonly class($one, $two, $three) {};"),
+    ).toMatchSnapshot();
+  });
   it("static array", () => {
     expect(
       parser.parseEval("return new self::$mapping[$map]();"),