diff --git a/packages/mermaid/package.json b/packages/mermaid/package.json
index bec56d3a04..982b9d0633 100644
--- a/packages/mermaid/package.json
+++ b/packages/mermaid/package.json
@@ -81,7 +81,7 @@
     "katex": "^0.16.9",
     "khroma": "^2.1.0",
     "lodash-es": "^4.17.21",
-    "mdast-util-from-markdown": "^2.0.0",
+    "marked": "^13.0.2",
     "stylis": "^4.3.1",
     "ts-dedent": "^2.2.0",
     "uuid": "^9.0.1"
diff --git a/packages/mermaid/src/rendering-util/createText.ts b/packages/mermaid/src/rendering-util/createText.ts
index 18695c8187..462a4834f1 100644
--- a/packages/mermaid/src/rendering-util/createText.ts
+++ b/packages/mermaid/src/rendering-util/createText.ts
@@ -153,7 +153,7 @@ function updateTextContentAndStyles(tspan: any, wrappedLine: MarkdownWord[]) {
   wrappedLine.forEach((word, index) => {
     const innerTspan = tspan
       .append('tspan')
-      .attr('font-style', word.type === 'emphasis' ? 'italic' : 'normal')
+      .attr('font-style', word.type === 'em' ? 'italic' : 'normal')
       .attr('class', 'text-inner-tspan')
       .attr('font-weight', word.type === 'strong' ? 'bold' : 'normal');
     if (index === 0) {
diff --git a/packages/mermaid/src/rendering-util/handle-markdown-text.spec.ts b/packages/mermaid/src/rendering-util/handle-markdown-text.spec.ts
index 7362e6f70f..3ab4167a22 100644
--- a/packages/mermaid/src/rendering-util/handle-markdown-text.spec.ts
+++ b/packages/mermaid/src/rendering-util/handle-markdown-text.spec.ts
@@ -1,4 +1,3 @@
-/* eslint-disable no-irregular-whitespace */
 import { markdownToLines, markdownToHTML } from './handle-markdown-text.js';
 import { test, expect } from 'vitest';
 
@@ -37,9 +36,9 @@ Here is a line *with an italic* section`;
       { content: 'is', type: 'normal' },
       { content: 'a', type: 'normal' },
       { content: 'line', type: 'normal' },
-      { content: 'with', type: 'emphasis' },
-      { content: 'an', type: 'emphasis' },
-      { content: 'italic', type: 'emphasis' },
+      { content: 'with', type: 'em' },
+      { content: 'an', type: 'em' },
+      { content: 'italic', type: 'em' },
       { content: 'section', type: 'normal' },
     ],
   ];
@@ -143,7 +142,7 @@ test('markdownToLines - Only italic formatting', () => {
       { content: 'This', type: 'normal' },
       { content: 'is', type: 'normal' },
       { content: 'an', type: 'normal' },
-      { content: 'italic', type: 'emphasis' },
+      { content: 'italic', type: 'em' },
       { content: 'test', type: 'normal' },
     ],
   ];
@@ -156,7 +155,7 @@ it('markdownToLines - Mixed formatting', () => {
   let input = `*Italic* and **bold** formatting`;
   let expected = [
     [
-      { content: 'Italic', type: 'emphasis' },
+      { content: 'Italic', type: 'em' },
       { content: 'and', type: 'normal' },
       { content: 'bold', type: 'strong' },
       { content: 'formatting', type: 'normal' },
@@ -167,9 +166,9 @@ it('markdownToLines - Mixed formatting', () => {
   input = `*Italic with space* and **bold ws** formatting`;
   expected = [
     [
-      { content: 'Italic', type: 'emphasis' },
-      { content: 'with', type: 'emphasis' },
-      { content: 'space', type: 'emphasis' },
+      { content: 'Italic', type: 'em' },
+      { content: 'with', type: 'em' },
+      { content: 'space', type: 'em' },
       { content: 'and', type: 'normal' },
       { content: 'bold', type: 'strong' },
       { content: 'ws', type: 'strong' },
@@ -191,9 +190,9 @@ Word!`;
       { content: 'the', type: 'strong' },
       { content: 'hog...', type: 'normal' },
       { content: 'a', type: 'normal' },
-      { content: 'very', type: 'emphasis' },
-      { content: 'long', type: 'emphasis' },
-      { content: 'text', type: 'emphasis' },
+      { content: 'very', type: 'em' },
+      { content: 'long', type: 'em' },
+      { content: 'text', type: 'em' },
       { content: 'about', type: 'normal' },
       { content: 'it', type: 'normal' },
     ],
@@ -215,13 +214,13 @@ test('markdownToLines - No auto wrapping', () => {
     [
       [
         {
-          "content": "Hello, how do",
+          "content": "Hello, how do",
           "type": "normal",
         },
       ],
       [
         {
-          "content": "you do?",
+          "content": "you do?",
           "type": "normal",
         },
       ],
@@ -298,3 +297,13 @@ test('markdownToHTML - no auto wrapping', () => {
     )
   ).toMatchInlineSnapshot('"<p>Hello,&nbsp;how&nbsp;do<br/>you&nbsp;do?</p>"');
 });
+
+test('markdownToHTML - auto wrapping', () => {
+  expect(
+    markdownToHTML(
+      `Hello, how do
+  you do?`,
+      { markdownAutoWrap: true }
+    )
+  ).toMatchInlineSnapshot('"<p>Hello, how do<br/>you do?</p>"');
+});
diff --git a/packages/mermaid/src/rendering-util/handle-markdown-text.ts b/packages/mermaid/src/rendering-util/handle-markdown-text.ts
index c539f72684..3846e7f37e 100644
--- a/packages/mermaid/src/rendering-util/handle-markdown-text.ts
+++ b/packages/mermaid/src/rendering-util/handle-markdown-text.ts
@@ -1,5 +1,5 @@
-import type { Content } from 'mdast';
-import { fromMarkdown } from 'mdast-util-from-markdown';
+import type { MarkedToken, Token } from 'marked';
+import { marked } from 'marked';
 import { dedent } from 'ts-dedent';
 import type { MarkdownLine, MarkdownWordType } from './types.js';
 import type { MermaidConfig } from '../config.type.js';
@@ -24,13 +24,13 @@ function preprocessMarkdown(markdown: string, { markdownAutoWrap }: MermaidConfi
  */
 export function markdownToLines(markdown: string, config: MermaidConfig = {}): MarkdownLine[] {
   const preprocessedMarkdown = preprocessMarkdown(markdown, config);
-  const { children } = fromMarkdown(preprocessedMarkdown);
+  const nodes = marked.lexer(preprocessedMarkdown);
   const lines: MarkdownLine[] = [[]];
   let currentLine = 0;
 
-  function processNode(node: Content, parentType: MarkdownWordType = 'normal') {
+  function processNode(node: MarkedToken, parentType: MarkdownWordType = 'normal') {
     if (node.type === 'text') {
-      const textLines = node.value.split('\n');
+      const textLines = node.text.split('\n');
       textLines.forEach((textLine, index) => {
         if (index !== 0) {
           currentLine++;
@@ -42,17 +42,17 @@ export function markdownToLines(markdown: string, config: MermaidConfig = {}): M
           }
         });
       });
-    } else if (node.type === 'strong' || node.type === 'emphasis') {
-      node.children.forEach((contentNode) => {
-        processNode(contentNode, node.type);
+    } else if (node.type === 'strong' || node.type === 'em') {
+      node.tokens.forEach((contentNode) => {
+        processNode(contentNode as MarkedToken, node.type);
       });
     }
   }
 
-  children.forEach((treeNode) => {
+  nodes.forEach((treeNode) => {
     if (treeNode.type === 'paragraph') {
-      treeNode.children.forEach((contentNode) => {
-        processNode(contentNode);
+      treeNode.tokens?.forEach((contentNode) => {
+        processNode(contentNode as MarkedToken);
       });
     }
   });
@@ -61,23 +61,23 @@ export function markdownToLines(markdown: string, config: MermaidConfig = {}): M
 }
 
 export function markdownToHTML(markdown: string, { markdownAutoWrap }: MermaidConfig = {}) {
-  const { children } = fromMarkdown(markdown);
+  const nodes = marked.lexer(markdown);
 
-  function output(node: Content): string {
+  function output(node: Token): string {
     if (node.type === 'text') {
       if (markdownAutoWrap === false) {
-        return node.value.replace(/\n/g, '<br/>').replace(/ /g, '&nbsp;');
+        return node.text.replace(/\n */g, '<br/>').replace(/ /g, '&nbsp;');
       }
-      return node.value.replace(/\n/g, '<br/>');
+      return node.text.replace(/\n */g, '<br/>');
     } else if (node.type === 'strong') {
-      return `<strong>${node.children.map(output).join('')}</strong>`;
-    } else if (node.type === 'emphasis') {
-      return `<em>${node.children.map(output).join('')}</em>`;
+      return `<strong>${node.tokens?.map(output).join('')}</strong>`;
+    } else if (node.type === 'em') {
+      return `<em>${node.tokens?.map(output).join('')}</em>`;
     } else if (node.type === 'paragraph') {
-      return `<p>${node.children.map(output).join('')}</p>`;
+      return `<p>${node.tokens?.map(output).join('')}</p>`;
     }
     return `Unsupported markdown: ${node.type}`;
   }
 
-  return children.map(output).join('');
+  return nodes.map(output).join('');
 }
diff --git a/packages/mermaid/src/rendering-util/types.d.ts b/packages/mermaid/src/rendering-util/types.d.ts
index 6dabb476d0..d7a06a8fd9 100644
--- a/packages/mermaid/src/rendering-util/types.d.ts
+++ b/packages/mermaid/src/rendering-util/types.d.ts
@@ -1,4 +1,4 @@
-export type MarkdownWordType = 'normal' | 'strong' | 'emphasis';
+export type MarkdownWordType = 'normal' | 'strong' | 'em';
 export interface MarkdownWord {
   content: string;
   type: MarkdownWordType;
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 35d96ff4ba..20475ea936 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -239,9 +239,9 @@ importers:
       lodash-es:
         specifier: ^4.17.21
         version: 4.17.21
-      mdast-util-from-markdown:
-        specifier: ^2.0.0
-        version: 2.0.1
+      marked:
+        specifier: ^13.0.2
+        version: 13.0.2
       stylis:
         specifier: ^4.3.1
         version: 4.3.2
@@ -6831,6 +6831,11 @@ packages:
   markdown-table@3.0.3:
     resolution: {integrity: sha512-Z1NL3Tb1M9wH4XESsCDEksWoKTdlUafKc4pt0GRwjUyXaCFZ+dc3g2erqB6zm3szA2IUSi7VnPI+o/9jnxh9hw==}
 
+  marked@13.0.2:
+    resolution: {integrity: sha512-J6CPjP8pS5sgrRqxVRvkCIkZ6MFdRIjDkwUwgJ9nL2fbmM6qGQeB2C16hi8Cc9BOzj6xXzy0jyi0iPIfnMHYzA==}
+    engines: {node: '>= 18'}
+    hasBin: true
+
   marked@4.3.0:
     resolution: {integrity: sha512-PRsaiG84bK+AMvxziE/lCFss8juXjNaWzVbN5tXAm4XjeaS9NAHhop+PjQxz2A9h8Q4M/xGmzP8vqNwy6JeK0A==}
     engines: {node: '>= 12'}
@@ -17665,6 +17670,8 @@ snapshots:
 
   markdown-table@3.0.3: {}
 
+  marked@13.0.2: {}
+
   marked@4.3.0: {}
 
   mdast-builder@1.1.1:
diff --git a/scripts/size.ts b/scripts/size.ts
index 2190fd9ef2..1c486197b0 100644
--- a/scripts/size.ts
+++ b/scripts/size.ts
@@ -25,6 +25,7 @@ const formatBytes = (bytes: number): string => {
   if (bytes == 0) {
     return '0 Bytes';
   }
+  bytes = Math.abs(bytes);
   const base = 1024;
   const decimals = 2;
   const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];