diff --git a/src/app/features/config/icon-input/icon-input.component.ts b/src/app/features/config/icon-input/icon-input.component.ts
index aeb81048f..be5c83663 100644
--- a/src/app/features/config/icon-input/icon-input.component.ts
+++ b/src/app/features/config/icon-input/icon-input.component.ts
@@ -21,7 +21,7 @@ export class IconInputComponent extends FieldType<FormlyFieldConfig> implements
     return this.to.type || 'text';
   }
 
-  ngOnInit(): void {
+  override ngOnInit(): void {
     this.filteredIcons$ = this.formControl.valueChanges.pipe(
       startWith(''),
       filter((searchTerm) => !!searchTerm),
diff --git a/src/app/features/note/dialog-add-note/dialog-add-note.component.ts b/src/app/features/note/dialog-add-note/dialog-add-note.component.ts
index 112b336b7..27032cd50 100644
--- a/src/app/features/note/dialog-add-note/dialog-add-note.component.ts
+++ b/src/app/features/note/dialog-add-note/dialog-add-note.component.ts
@@ -19,11 +19,11 @@ export class DialogAddNoteComponent
   extends DialogFullscreenMarkdownComponent
   implements OnDestroy
 {
-  T: typeof T = T;
-  data: { content: string };
+  override T: typeof T = T;
+  override data: { content: string };
 
   constructor(
-    public _matDialogRef: MatDialogRef<DialogAddNoteComponent>,
+    public override _matDialogRef: MatDialogRef<DialogAddNoteComponent>,
     private _noteService: NoteService,
   ) {
     const data = { content: sessionStorage.getItem(SS.NOTE_TMP) || '' };
@@ -31,7 +31,7 @@ export class DialogAddNoteComponent
     this.data = data;
   }
 
-  close(isSkipSave: boolean = false): void {
+  override close(isSkipSave: boolean = false): void {
     if (!isSkipSave && this.data.content && this.data.content.trim().length > 0) {
       this._noteService.add({ content: this.data.content }, true);
       this._clearSessionStorage();
@@ -39,7 +39,7 @@ export class DialogAddNoteComponent
     this._matDialogRef.close();
   }
 
-  ngModelChange(val: string = this.data.content || ''): void {
+  override ngModelChange(val: string = this.data.content || ''): void {
     sessionStorage.setItem(SS.NOTE_TMP, val);
   }
 
diff --git a/src/hammer-config.class.ts b/src/hammer-config.class.ts
index 1549e0b01..18e115cb7 100644
--- a/src/hammer-config.class.ts
+++ b/src/hammer-config.class.ts
@@ -10,7 +10,7 @@ const DIRECTION_HORIZONTAL = DIRECTION_LEFT | DIRECTION_RIGHT;
 
 @Injectable({ providedIn: 'root' })
 export class MyHammerConfig extends HammerGestureConfig {
-  overrides: {
+  override overrides: {
     [key: string]: Record<string, unknown>;
   } = {
     swipe: { direction: DIRECTION_HORIZONTAL },
diff --git a/tsconfig.base.json b/tsconfig.base.json
index 05b2b53d4..5349b8115 100644
--- a/tsconfig.base.json
+++ b/tsconfig.base.json
@@ -14,6 +14,7 @@
     "noImplicitReturns": true,
     "noUnusedLocals": false,
     "noImplicitAny": false,
+    "noImplicitOverride": true,
     "strictPropertyInitialization": true,
     "target": "ES2015",
     "resolveJsonModule": true,