diff --git a/src/main/java/org/codelibs/fess/app/web/admin/upgrade/AdminUpgradeAction.java b/src/main/java/org/codelibs/fess/app/web/admin/upgrade/AdminUpgradeAction.java
index c8733eaf3..034dac384 100644
--- a/src/main/java/org/codelibs/fess/app/web/admin/upgrade/AdminUpgradeAction.java
+++ b/src/main/java/org/codelibs/fess/app/web/admin/upgrade/AdminUpgradeAction.java
@@ -53,6 +53,8 @@ public class AdminUpgradeAction extends FessAdminAction {
 
     private static final String VERSION_12_2 = "12.2";
 
+    private static final String VERSION_12_3 = "12.3";
+
     // ===================================================================================
     //                                                                           Attribute
     //
@@ -128,6 +130,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom12_0();
                 upgradeFrom12_1();
                 upgradeFrom12_2();
+                upgradeFrom12_3();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -141,6 +144,7 @@ public class AdminUpgradeAction extends FessAdminAction {
             try {
                 upgradeFrom12_1();
                 upgradeFrom12_2();
+                upgradeFrom12_3();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -153,6 +157,19 @@ public class AdminUpgradeAction extends FessAdminAction {
         } else if (VERSION_12_2.equals(form.targetVersion)) {
             try {
                 upgradeFrom12_2();
+                upgradeFrom12_3();
+                upgradeFromAll();
+
+                saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
+
+                systemHelper.reloadConfiguration();
+            } catch (final Exception e) {
+                logger.warn("Failed to upgrade data.", e);
+                saveError(messages -> messages.addErrorsFailedToUpgradeFrom(GLOBAL, VERSION_12_2, e.getLocalizedMessage()));
+            }
+        } else if (VERSION_12_3.equals(form.targetVersion)) {
+            try {
+                upgradeFrom12_3();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -183,6 +200,10 @@ public class AdminUpgradeAction extends FessAdminAction {
     }
 
     private void upgradeFrom12_2() {
+        // nothing
+    }
+
+    private void upgradeFrom12_3() {
         ComponentUtil.getThumbnailManager().migrate();
     }
 
diff --git a/src/main/webapp/WEB-INF/view/admin/upgrade/admin_upgrade.jsp b/src/main/webapp/WEB-INF/view/admin/upgrade/admin_upgrade.jsp
index 7c918a3e6..7f3fbb71b 100644
--- a/src/main/webapp/WEB-INF/view/admin/upgrade/admin_upgrade.jsp
+++ b/src/main/webapp/WEB-INF/view/admin/upgrade/admin_upgrade.jsp
@@ -47,6 +47,7 @@
 												<la:option value="12.0">12.0</la:option>
 												<la:option value="12.1">12.1</la:option>
 												<la:option value="12.2">12.2</la:option>
+												<la:option value="12.3">12.3</la:option>
 											</la:select>
 										</div>
 									</div>