diff --git a/packages/ckeditor5-build-trilium/src/ckeditor_balloon.ts b/packages/ckeditor5-build-trilium/src/ckeditor_balloon.ts
index 5f5622498..8df7bfe59 100644
--- a/packages/ckeditor5-build-trilium/src/ckeditor_balloon.ts
+++ b/packages/ckeditor5-build-trilium/src/ckeditor_balloon.ts
@@ -53,6 +53,7 @@ export default class BalloonEditor extends BalloonEditorBase {
 					'includeNote',
 					'|',
 					'math',
+					'mermaid',
 					'horizontalLine',
 					'pageBreak'
 				]
diff --git a/packages/ckeditor5-build-trilium/src/ckeditor_decoupled.ts b/packages/ckeditor5-build-trilium/src/ckeditor_decoupled.ts
index 2eb402085..5e08f869c 100644
--- a/packages/ckeditor5-build-trilium/src/ckeditor_decoupled.ts
+++ b/packages/ckeditor5-build-trilium/src/ckeditor_decoupled.ts
@@ -59,6 +59,7 @@ export default class DecoupledEditor extends DecoupledEditorBase {
 						'|',
 						'specialCharacters',
 						'math',
+						'mermaid',
 						'horizontalLine',
 						'pageBreak'
 					]
diff --git a/packages/ckeditor5-build-trilium/src/config.ts b/packages/ckeditor5-build-trilium/src/config.ts
index 84731d3c8..49b306b28 100644
--- a/packages/ckeditor5-build-trilium/src/config.ts
+++ b/packages/ckeditor5-build-trilium/src/config.ts
@@ -54,6 +54,7 @@ import { SpecialCharacters, SpecialCharactersEssentials } from '@ckeditor/ckedit
 import { GeneralHtmlSupport } from "@ckeditor/ckeditor5-html-support";
 import Uploadfileplugin from "../../ckeditor5-file-upload/uploadfileplugin";
 import { PageBreak } from '@ckeditor/ckeditor5-page-break';
+import { Mermaid } from "../../ckeditor5-mermaid/src/index";
 
 import MentionCustomization from './mention_customization';
 import UploadimagePlugin from './uploadimage';
@@ -143,7 +144,8 @@ export const COMMON_PLUGINS = [
 	// External plugins
 	Math,
 	AutoformatMath,
-	Footnotes
+	Footnotes,
+	Mermaid
 ];
 
 export const COMMON_SETTINGS = {