diff --git a/packages/mermaid/src/diagrams/gantt/ganttDb.js b/packages/mermaid/src/diagrams/gantt/ganttDb.js
index fa872027d..6ce5336fd 100644
--- a/packages/mermaid/src/diagrams/gantt/ganttDb.js
+++ b/packages/mermaid/src/diagrams/gantt/ganttDb.js
@@ -1,8 +1,8 @@
 import { sanitizeUrl } from '@braintree/sanitize-url';
-import dayjs from 'dayjs';
-import dayjsIsoWeek from 'dayjs/plugin/isoWeek.js';
-import dayjsCustomParseFormat from 'dayjs/plugin/customParseFormat.js';
-import dayjsAdvancedFormat from 'dayjs/plugin/advancedFormat.js';
+import dayjs from 'dayjs/esm/index.js';
+import dayjsIsoWeek from 'dayjs/esm/plugin/isoWeek/index.js';
+import dayjsCustomParseFormat from 'dayjs/esm/plugin/customParseFormat/index.js';
+import dayjsAdvancedFormat from 'dayjs/esm/plugin/advancedFormat/index.js';
 import { log } from '../../logger';
 import * as configApi from '../../config';
 import utils from '../../utils';
diff --git a/packages/mermaid/src/diagrams/gantt/ganttDb.spec.ts b/packages/mermaid/src/diagrams/gantt/ganttDb.spec.ts
index 812cfd9b8..7dc2e2a59 100644
--- a/packages/mermaid/src/diagrams/gantt/ganttDb.spec.ts
+++ b/packages/mermaid/src/diagrams/gantt/ganttDb.spec.ts
@@ -1,5 +1,5 @@
 // @ts-nocheck TODO: Fix TS
-import dayjs from 'dayjs';
+import dayjs from 'dayjs/esm/index.js';
 import ganttDb from './ganttDb';
 import { convert } from '../../tests/util';
 
diff --git a/packages/mermaid/src/diagrams/gantt/ganttRenderer.js b/packages/mermaid/src/diagrams/gantt/ganttRenderer.js
index 78bf2fcea..fb692828f 100644
--- a/packages/mermaid/src/diagrams/gantt/ganttRenderer.js
+++ b/packages/mermaid/src/diagrams/gantt/ganttRenderer.js
@@ -1,4 +1,4 @@
-import dayjs from 'dayjs';
+import dayjs from 'dayjs/esm/index.js';
 import { log } from '../../logger';
 import {
   select,
diff --git a/packages/mermaid/src/logger.ts b/packages/mermaid/src/logger.ts
index 44b98315c..da5e8a221 100644
--- a/packages/mermaid/src/logger.ts
+++ b/packages/mermaid/src/logger.ts
@@ -2,7 +2,7 @@
 /* eslint-disable @typescript-eslint/no-unused-vars */
 /* eslint-disable @typescript-eslint/no-empty-function */
 /* eslint-disable no-console */
-import dayjs from 'dayjs';
+import dayjs from 'dayjs/esm/index.js';
 
 export type LogLevel = 'trace' | 'debug' | 'info' | 'warn' | 'error' | 'fatal';