diff --git a/CHANGELOG.md b/CHANGELOG.md
index ecb1c29c..ab179434 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,7 @@ All notable changes to this project will be documented in this file. The format
 
 ### Fixed
 
+- **About**: The About window shows the installed API SITNA version and the installed OpenLayers version. Both values are read from the installed packages when the viewer is built ([#218](https://github.com/sitmun/sitmun-viewer-app/issues/218)).
 - **Map**: A WFS row in Loaded Layers uses the root folder as its heading, the same folder path as a WMS row, and the leaf name as its title. The toolbar overflow control shows › when the extra tools are hidden and ‹ when they are open, on every Loaded Layers row that has that control.
 - **Map**: A WFS entry in the legend lists the root folder and each intermediate folder above the layer, the same way a WMS legend does. The point swatch stays on the layer.
 - **Map**: An identify field with format Image keeps the original address and SITNA's `img.tc-img-attr`. `maxWidth` and `maxHeight` on the field set those limits. A field without them stays `width:auto;height:auto`.
diff --git a/README.md b/README.md
index 45d3ff5e..9560cd38 100644
--- a/README.md
+++ b/README.md
@@ -52,7 +52,7 @@ This frontend integrates with the [SITMUN Backend Core](https://github.com/sitmu
 - Internationalization (CA, ES, EN, FR)
 - Configurable UI components
 - Lazy loading and efficient rendering
-- SITNA integration (api-sitna 4.8.0)
+- SITNA integration (api-sitna 4.9.1, OpenLayers 10.5.0)
 - Service Worker for API auth token forwarding
 
 ## Quick Start
@@ -453,7 +453,10 @@ The application uses the **SITNA (Sistema de Información Territorial de Navarra
 
 **Version Information:**
 
-- **SITNA API Version**: Aligned with api-sitna 4.8.0
+- **SITNA API Version**: api-sitna 4.9.1
+- **OpenLayers**: 10.5.0, the version api-sitna 4.9.1 depends on
+
+The About window reads both versions from the installed packages when the viewer is built.
 
 #### **Core Mapping Features**
 
@@ -581,7 +584,7 @@ src/
 - **Modular Design**: Feature-based module organization
 - **Reactive Programming**: RxJS for asynchronous operations
 - **Material Design**: Angular Material for consistent UI
-- **SITNA Integration**: Advanced mapping through SITNA library (api-sitna 4.8.0)
+- **SITNA Integration**: Advanced mapping through SITNA library (api-sitna 4.9.1, OpenLayers 10.5.0)
 
 ## Contributing
 
diff --git a/src/app/ui/components/about-dialog/about-dialog.component.html b/src/app/ui/components/about-dialog/about-dialog.component.html
index bafc9f4d..d3ef76fd 100644
--- a/src/app/ui/components/about-dialog/about-dialog.component.html
+++ b/src/app/ui/components/about-dialog/about-dialog.component.html
@@ -40,17 +40,25 @@ <h2 mat-dialog-title>{{ 'systemInfo.about' | translate }}</h2>
       </div>
     </div>
 
-    @if (data.sitnaVersion) {
-      <div class="about-item">
-        <mat-icon class="about-icon">map</mat-icon>
-        <div class="about-info">
-          <span class="about-label">
-            {{ 'systemInfo.sitnaVersion' | translate }}:
-          </span>
-          <span class="about-value">{{ data.sitnaVersion }}</span>
-        </div>
+    <div class="about-item">
+      <mat-icon class="about-icon">map</mat-icon>
+      <div class="about-info">
+        <span class="about-label">
+          {{ 'systemInfo.sitnaVersion' | translate }}:
+        </span>
+        <span class="about-value">{{ data.sitnaVersion }}</span>
       </div>
-    }
+    </div>
+
+    <div class="about-item">
+      <mat-icon class="about-icon">layers</mat-icon>
+      <div class="about-info">
+        <span class="about-label">
+          {{ 'systemInfo.openLayersVersion' | translate }}:
+        </span>
+        <span class="about-value">{{ data.openLayersVersion }}</span>
+      </div>
+    </div>
 
     @if (data.buildTimestamp) {
       <div class="about-item">
diff --git a/src/app/ui/components/about-dialog/about-dialog.component.ts b/src/app/ui/components/about-dialog/about-dialog.component.ts
index 7781f38c..4cc3b751 100644
--- a/src/app/ui/components/about-dialog/about-dialog.component.ts
+++ b/src/app/ui/components/about-dialog/about-dialog.component.ts
@@ -7,13 +7,10 @@ export interface AboutDialogData {
   environmentName: string;
   angularVersion: string;
   buildTimestamp?: string;
-  sitnaVersion?: string;
+  sitnaVersion: string;
+  openLayersVersion: string;
 }
 
-/**
- * Component for displaying application information dialog.
- * TODO: Add unit tests (about-dialog.component.spec.ts)
- */
 @Component({
   standalone: false,
   selector: 'app-about-dialog',
diff --git a/src/app/ui/components/about-dialog/library-versions.ts b/src/app/ui/components/about-dialog/library-versions.ts
new file mode 100644
index 00000000..fe2a9f4e
--- /dev/null
+++ b/src/app/ui/components/about-dialog/library-versions.ts
@@ -0,0 +1,5 @@
+import sitnaPackage from 'api-sitna/package.json';
+import olPackage from 'ol/package.json';
+
+export const sitnaVersion: string = sitnaPackage.version;
+export const openLayersVersion: string = olPackage.version;
diff --git a/src/app/ui/components/menu/menu.component.spec.ts b/src/app/ui/components/menu/menu.component.spec.ts
index 096d008d..4467ebd1 100644
--- a/src/app/ui/components/menu/menu.component.spec.ts
+++ b/src/app/ui/components/menu/menu.component.spec.ts
@@ -1,3 +1,6 @@
+import { readFileSync } from 'fs';
+import { join } from 'path';
+
 import { NgOptimizedImage } from '@angular/common';
 import { provideHttpClient } from '@angular/common/http';
 import { provideHttpClientTesting } from '@angular/common/http/testing';
@@ -17,6 +20,17 @@ import { AuthenticationService } from '@auth/services/authentication.service';
 import { TranslateModule, TranslateService } from '@ngx-translate/core';
 
 import { MenuComponent } from './menu.component';
+import { AboutDialogComponent } from '../about-dialog/about-dialog.component';
+
+function installedPackageVersion(name: string): string {
+  const manifest = JSON.parse(
+    readFileSync(
+      join(process.cwd(), 'node_modules', name, 'package.json'),
+      'utf8'
+    )
+  ) as { version: string };
+  return manifest.version;
+}
 
 describe('MenuComponent', () => {
   let component: MenuComponent;
@@ -24,7 +38,7 @@ describe('MenuComponent', () => {
 
   beforeEach(async () => {
     await TestBed.configureTestingModule({
-      declarations: [MenuComponent],
+      declarations: [MenuComponent, AboutDialogComponent],
       imports: [
         BrowserAnimationsModule,
         NgOptimizedImage,
@@ -92,4 +106,31 @@ describe('MenuComponent', () => {
   it('should initialize with default language', () => {
     expect(component.currentLang).toBe('en');
   });
+
+  it('shows the installed SITNA and OpenLayers versions in About', () => {
+    const translate = TestBed.inject(TranslateService);
+    translate.setTranslation('en', {
+      'systemInfo.about': 'About',
+      'systemInfo.application': 'Application',
+      'systemInfo.applicationName': 'Visualizador SITMUN',
+      'systemInfo.version': 'Version',
+      'systemInfo.environment': 'Environment',
+      'systemInfo.angularVersion': 'Angular Version',
+      'systemInfo.sitnaVersion': 'API SITNA Version',
+      'systemInfo.openLayersVersion': 'OpenLayers Version',
+      'common.button.close': 'Close'
+    });
+    translate.use('en');
+
+    component.openAboutDialog();
+    fixture.detectChanges();
+
+    const text = (document.body.textContent ?? '').replace(/\s+/g, ' ');
+    expect(text).toContain(
+      `API SITNA Version: ${installedPackageVersion('api-sitna')}`
+    );
+    expect(text).toContain(
+      `OpenLayers Version: ${installedPackageVersion('ol')}`
+    );
+  });
 });
diff --git a/src/app/ui/components/menu/menu.component.ts b/src/app/ui/components/menu/menu.component.ts
index 3a4c32d8..74d449b0 100644
--- a/src/app/ui/components/menu/menu.component.ts
+++ b/src/app/ui/components/menu/menu.component.ts
@@ -29,6 +29,10 @@ import {
   AboutDialogComponent,
   AboutDialogData
 } from '../about-dialog/about-dialog.component';
+import {
+  openLayersVersion,
+  sitnaVersion
+} from '../about-dialog/library-versions';
 
 @Component({
   standalone: false,
@@ -182,7 +186,8 @@ export class MenuComponent implements OnInit, OnDestroy {
       environmentName: this.environment.environmentName || 'N/A',
       angularVersion: this.angularVersion,
       buildTimestamp: (this.environment as any).buildTimestamp,
-      sitnaVersion: this.environment.sitnaVersion
+      sitnaVersion,
+      openLayersVersion
     };
 
     this.dialog.open(AboutDialogComponent, {
diff --git a/src/assets/i18n/ca.json b/src/assets/i18n/ca.json
index 5636e263..6f9f194a 100644
--- a/src/assets/i18n/ca.json
+++ b/src/assets/i18n/ca.json
@@ -278,6 +278,7 @@
   "systemInfo.errorType.logger": "Error d'aplicació",
   "systemInfo.errorType.uncaught": "Excepció no capturada",
   "systemInfo.noErrors": "No hi ha errors registrats",
+  "systemInfo.openLayersVersion": "Versió d'OpenLayers",
   "systemInfo.recentErrors": "Errors recents",
   "systemInfo.sitnaVersion": "Versió API SITNA",
   "systemInfo.version": "Versió",
diff --git a/src/assets/i18n/en.json b/src/assets/i18n/en.json
index 6cd23abf..777afe3c 100644
--- a/src/assets/i18n/en.json
+++ b/src/assets/i18n/en.json
@@ -278,6 +278,7 @@
   "systemInfo.errorType.logger": "Application Error",
   "systemInfo.errorType.uncaught": "Uncaught Exception",
   "systemInfo.noErrors": "No errors recorded",
+  "systemInfo.openLayersVersion": "OpenLayers Version",
   "systemInfo.recentErrors": "Recent Errors",
   "systemInfo.sitnaVersion": "API SITNA Version",
   "systemInfo.version": "Version",
diff --git a/src/assets/i18n/es.json b/src/assets/i18n/es.json
index 01cee2e3..b8c06b9e 100644
--- a/src/assets/i18n/es.json
+++ b/src/assets/i18n/es.json
@@ -278,6 +278,7 @@
   "systemInfo.errorType.logger": "Error de Aplicación",
   "systemInfo.errorType.uncaught": "Excepción No Capturada",
   "systemInfo.noErrors": "No hay errores registrados",
+  "systemInfo.openLayersVersion": "Versión de OpenLayers",
   "systemInfo.recentErrors": "Errores Recientes",
   "systemInfo.sitnaVersion": "Versión API SITNA",
   "systemInfo.version": "Versión",
diff --git a/src/assets/i18n/fr.json b/src/assets/i18n/fr.json
index 16a076cc..3d0fbe2c 100644
--- a/src/assets/i18n/fr.json
+++ b/src/assets/i18n/fr.json
@@ -278,6 +278,7 @@
   "systemInfo.errorType.logger": "Erreur d'application",
   "systemInfo.errorType.uncaught": "Exception non interceptée",
   "systemInfo.noErrors": "Aucune erreur enregistrée",
+  "systemInfo.openLayersVersion": "Version d'OpenLayers",
   "systemInfo.recentErrors": "Erreurs récentes",
   "systemInfo.sitnaVersion": "Version API SITNA",
   "systemInfo.version": "Version",
diff --git a/src/assets/i18n/oc-aranes.json b/src/assets/i18n/oc-aranes.json
index 7e3b2fb4..926535d5 100644
--- a/src/assets/i18n/oc-aranes.json
+++ b/src/assets/i18n/oc-aranes.json
@@ -278,6 +278,7 @@
   "systemInfo.errorType.logger": "Error d'aplicacion",
   "systemInfo.errorType.uncaught": "Excepcion no capturada",
   "systemInfo.noErrors": "Non i a errors registrats",
+  "systemInfo.openLayersVersion": "Versió OpenLayers",
   "systemInfo.recentErrors": "Errors recents",
   "systemInfo.sitnaVersion": "Versió API SITNA",
   "systemInfo.version": "Versió",
diff --git a/src/environments/environment.e2e.ts b/src/environments/environment.e2e.ts
index 61bfbc87..54d76257 100644
--- a/src/environments/environment.e2e.ts
+++ b/src/environments/environment.e2e.ts
@@ -8,7 +8,6 @@ export const environment = {
   apiUrl: '/backend',
   version: '1.2.9',
   environmentName: 'E2E',
-  sitnaVersion: '4.8.0',
   buildTimestamp: new Date().toISOString(),
   loginBackgroundImageUrl: '',
   proxyTokenRefreshIntervalMs: 10 * 60 * 1000,
diff --git a/src/environments/environment.prod.ts b/src/environments/environment.prod.ts
index dffa2dca..04564562 100644
--- a/src/environments/environment.prod.ts
+++ b/src/environments/environment.prod.ts
@@ -9,7 +9,6 @@ export const environment = {
   apiUrl: '/backend', // Change this when there is a real production environment
   version: '1.2.9',
   environmentName: 'Production',
-  sitnaVersion: '4.8.0',
   buildTimestamp: new Date().toISOString(),
   loginBackgroundImageUrl: 'assets/logos/barcelona_background.jpg',
   proxyTokenRefreshIntervalMs: 2 * 60 * 1000,
diff --git a/src/environments/environment.ts b/src/environments/environment.ts
index b0250eec..aacffb1e 100644
--- a/src/environments/environment.ts
+++ b/src/environments/environment.ts
@@ -9,7 +9,6 @@ export const environment = {
   apiUrl: 'http://localhost:9000/backend',
   version: '1.2.9',
   environmentName: 'Development',
-  sitnaVersion: '4.8.0',
   buildTimestamp: new Date().toISOString(),
   loginBackgroundImageUrl: 'assets/logos/barcelona_background.jpg',
   proxyTokenRefreshIntervalMs: 2 * 60 * 1000,
diff --git a/tsconfig.json b/tsconfig.json
index c984541e..3cbbdc4a 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -18,6 +18,7 @@
     "moduleResolution": "bundler",
     "importHelpers": true,
     "esModuleInterop": true,
+    "resolveJsonModule": true,
     "target": "ES2022",
     "module": "es2020",
     "types": ["node"],