diff --git a/static/js/managers/BannerService.js b/static/js/managers/BannerService.js
index 3711585f..c2226fce 100644
--- a/static/js/managers/BannerService.js
+++ b/static/js/managers/BannerService.js
@@ -62,6 +62,12 @@ class BannerService {
      */
     registerBanner(id, bannerConfig) {
         this.banners.set(id, bannerConfig);
+        
+        // If already initialized, render the banner immediately
+        if (this.initialized && !this.isBannerDismissed(id) && this.container) {
+            this.renderBanner(bannerConfig);
+            this.updateContainerVisibility();
+        }
     }
 
     /**
@@ -88,6 +94,12 @@ class BannerService {
         // Remove banner from DOM
         const bannerElement = document.querySelector(`[data-banner-id="${bannerId}"]`);
         if (bannerElement) {
+            // Call onRemove callback if provided
+            const banner = this.banners.get(bannerId);
+            if (banner && typeof banner.onRemove === 'function') {
+                banner.onRemove(bannerElement);
+            }
+            
             bannerElement.style.animation = 'banner-slide-up 0.3s ease-in-out forwards';
             setTimeout(() => {
                 bannerElement.remove();
@@ -122,12 +134,16 @@ class BannerService {
         bannerElement.className = 'banner-item';
         bannerElement.setAttribute('data-banner-id', banner.id);
 
-        const actionsHtml = banner.actions ? banner.actions.map(action => 
-            `<a href="${action.url}" target="_blank" class="banner-action banner-action-${action.type}" rel="noopener noreferrer">
+        const actionsHtml = banner.actions ? banner.actions.map(action => {
+            const actionAttribute = action.action ? `data-action="${action.action}"` : '';
+            const href = action.url ? `href="${action.url}"` : '#';
+            const target = action.url ? 'target="_blank" rel="noopener noreferrer"' : '';
+            
+            return `<a ${href ? `href="${href}"` : ''} ${target} class="banner-action banner-action-${action.type}" ${actionAttribute}>
                 <i class="${action.icon}"></i>
                 <span>${action.text}</span>
-            </a>`
-        ).join('') : '';
+            </a>`;
+        }).join('') : '';
 
         const dismissButtonHtml = banner.dismissible ? 
             `<button class="banner-dismiss" onclick="bannerService.dismissBanner('${banner.id}')" title="Dismiss">
@@ -148,6 +164,11 @@ class BannerService {
         `;
 
         this.container.appendChild(bannerElement);
+        
+        // Call onRegister callback if provided
+        if (typeof banner.onRegister === 'function') {
+            banner.onRegister(bannerElement);
+        }
     }
 
     /**
diff --git a/static/js/managers/UpdateService.js b/static/js/managers/UpdateService.js
index e7a7bb49..17723acf 100644
--- a/static/js/managers/UpdateService.js
+++ b/static/js/managers/UpdateService.js
@@ -1,5 +1,13 @@
 import { modalManager } from './ModalManager.js';
-import { getStorageItem, setStorageItem } from '../utils/storageHelpers.js';
+import { 
+    getStorageItem, 
+    setStorageItem, 
+    getStoredVersionInfo, 
+    setStoredVersionInfo,
+    isVersionMatch,
+    resetDismissedBanner
+} from '../utils/storageHelpers.js';
+import { bannerService } from './BannerService.js';
 
 export class UpdateService {
     constructor() {
@@ -17,6 +25,8 @@ export class UpdateService {
         this.lastCheckTime = parseInt(getStorageItem('last_update_check') || '0');
         this.isUpdating = false;
         this.nightlyMode = getStorageItem('nightly_updates', false);
+        this.currentVersionInfo = null;
+        this.versionMismatch = false;
     }
 
     initialize() {
@@ -59,6 +69,9 @@ export class UpdateService {
 
         // Immediately update modal content with current values (even if from default)
         this.updateModalContent();
+        
+        // Check version info for mismatch after loading basic info
+        this.checkVersionInfo();
     }
     
     updateNightlyWarning() {
@@ -424,6 +437,110 @@ export class UpdateService {
         // Ensure badge visibility is updated after manual check
         this.updateBadgeVisibility();
     }
+    
+    async checkVersionInfo() {
+        try {
+            // Call API to get current version info
+            const response = await fetch('/api/version-info');
+            const data = await response.json();
+            
+            if (data.success) {
+                this.currentVersionInfo = data.version;
+                
+                // Check if version matches stored version
+                this.versionMismatch = !isVersionMatch(this.currentVersionInfo);
+                
+                if (this.versionMismatch) {
+                    console.log('Version mismatch detected:', {
+                        current: this.currentVersionInfo,
+                        stored: getStoredVersionInfo()
+                    });
+                    
+                    // Reset dismissed status for version mismatch banner
+                    resetDismissedBanner('version-mismatch');
+                    
+                    // Register and show the version mismatch banner
+                    this.registerVersionMismatchBanner();
+                }
+            }
+        } catch (error) {
+            console.error('Failed to check version info:', error);
+        }
+    }
+    
+    registerVersionMismatchBanner() {
+        // Get stored and current version for display
+        const storedVersion = getStoredVersionInfo() || 'unknown';
+        const currentVersion = this.currentVersionInfo || 'unknown';
+        
+        bannerService.registerBanner('version-mismatch', {
+            id: 'version-mismatch',
+            title: 'Application Update Detected',
+            content: `Your browser is running an outdated version of LoRA Manager (${storedVersion}). The server has been updated to version ${currentVersion}. Please refresh to ensure proper functionality.`,
+            actions: [
+                {
+                    text: 'Refresh Now',
+                    icon: 'fas fa-sync',
+                    action: 'hardRefresh',
+                    type: 'primary'
+                }
+            ],
+            dismissible: false,
+            priority: 10,
+            countdown: 15,
+            onRegister: (bannerElement) => {
+                // Add countdown element
+                const countdownEl = document.createElement('div');
+                countdownEl.className = 'banner-countdown';
+                countdownEl.innerHTML = `<span>Refreshing in <strong>15</strong> seconds...</span>`;
+                bannerElement.querySelector('.banner-content').appendChild(countdownEl);
+                
+                // Start countdown
+                let seconds = 15;
+                const countdownInterval = setInterval(() => {
+                    seconds--;
+                    const strongEl = countdownEl.querySelector('strong');
+                    if (strongEl) strongEl.textContent = seconds;
+                    
+                    if (seconds <= 0) {
+                        clearInterval(countdownInterval);
+                        this.performHardRefresh();
+                    }
+                }, 1000);
+                
+                // Store interval ID for cleanup
+                bannerElement.dataset.countdownInterval = countdownInterval;
+                
+                // Add action button event handler
+                const actionBtn = bannerElement.querySelector('.banner-action[data-action="hardRefresh"]');
+                if (actionBtn) {
+                    actionBtn.addEventListener('click', (e) => {
+                        e.preventDefault();
+                        clearInterval(countdownInterval);
+                        this.performHardRefresh();
+                    });
+                }
+            },
+            onRemove: (bannerElement) => {
+                // Clear any existing interval
+                const intervalId = bannerElement.dataset.countdownInterval;
+                if (intervalId) {
+                    clearInterval(parseInt(intervalId));
+                }
+            }
+        });
+    }
+    
+    performHardRefresh() {
+        // Update stored version info before refreshing
+        setStoredVersionInfo(this.currentVersionInfo);
+        
+        // Force a hard refresh by adding cache-busting parameter
+        const cacheBuster = new Date().getTime();
+        window.location.href = window.location.pathname + 
+            (window.location.search ? window.location.search + '&' : '?') + 
+            `cache=${cacheBuster}`;
+    }
 }
 
 // Create and export singleton instance
diff --git a/static/js/utils/storageHelpers.js b/static/js/utils/storageHelpers.js
index 1320d7bd..9b56c027 100644
--- a/static/js/utils/storageHelpers.js
+++ b/static/js/utils/storageHelpers.js
@@ -213,4 +213,45 @@ export function getMapFromStorage(key) {
         console.error(`Error loading Map from localStorage (${key}):`, error);
         return new Map();
     }
+}
+
+/**
+ * Get stored version info from localStorage
+ * @returns {string|null} The stored version string or null if not found
+ */
+export function getStoredVersionInfo() {
+    return getStorageItem('version_info', null);
+}
+
+/**
+ * Store version info to localStorage
+ * @param {string} versionInfo - The version info string to store
+ */
+export function setStoredVersionInfo(versionInfo) {
+    setStorageItem('version_info', versionInfo);
+}
+
+/**
+ * Check if version info matches between stored and current
+ * @param {string} currentVersionInfo - The current version info from server
+ * @returns {boolean} True if versions match or no stored version exists
+ */
+export function isVersionMatch(currentVersionInfo) {
+    const storedVersion = getStoredVersionInfo();
+    // If we have no stored version yet, consider it a match
+    if (storedVersion === null) {
+        setStoredVersionInfo(currentVersionInfo);
+        return true;
+    }
+    return storedVersion === currentVersionInfo;
+}
+
+/**
+ * Reset the dismissed status of a specific banner
+ * @param {string} bannerId - The ID of the banner to un-dismiss
+ */
+export function resetDismissedBanner(bannerId) {
+    const dismissedBanners = getStorageItem('dismissed_banners', []);
+    const updatedBanners = dismissedBanners.filter(id => id !== bannerId);
+    setStorageItem('dismissed_banners', updatedBanners);
 }
\ No newline at end of file