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 001964091..e26a29864 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
@@ -122,6 +122,8 @@ public class AdminUpgradeAction extends FessAdminAction {
 
     private static final String VERSION_14_14 = "14.14";
 
+    private static final String VERSION_14_15 = "14.15";
+
     // ===================================================================================
     //                                                                           Attribute
     //
@@ -221,6 +223,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -264,6 +267,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -306,6 +310,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -347,6 +352,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -387,6 +393,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -426,6 +433,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -464,6 +472,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -501,6 +510,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -537,6 +547,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -572,6 +583,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -606,6 +618,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -638,6 +651,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -669,6 +683,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -699,6 +714,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -728,6 +744,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -757,6 +774,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -785,6 +803,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -812,6 +831,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -838,6 +858,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -863,6 +884,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -887,6 +909,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -910,6 +933,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -932,6 +956,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -953,6 +978,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -973,6 +999,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -992,6 +1019,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -1010,6 +1038,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -1027,6 +1056,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -1043,6 +1073,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -1058,6 +1089,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -1072,6 +1104,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom14_12();
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -1085,6 +1118,7 @@ public class AdminUpgradeAction extends FessAdminAction {
             try {
                 upgradeFrom14_13();
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -1097,6 +1131,7 @@ public class AdminUpgradeAction extends FessAdminAction {
         } else if (VERSION_14_14.equals(form.targetVersion)) {
             try {
                 upgradeFrom14_14();
+                upgradeFrom14_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -1106,6 +1141,18 @@ public class AdminUpgradeAction extends FessAdminAction {
                 logger.warn("Failed to upgrade data.", e);
                 saveError(messages -> messages.addErrorsFailedToUpgradeFrom(GLOBAL, VERSION_14_14, e.getLocalizedMessage()));
             }
+        } else if (VERSION_14_15.equals(form.targetVersion)) {
+            try {
+                upgradeFrom14_15();
+                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_14_15, e.getLocalizedMessage()));
+            }
         } else {
             saveError(messages -> messages.addErrorsUnknownVersionForUpgrade(GLOBAL));
         }
@@ -1337,6 +1384,10 @@ public class AdminUpgradeAction extends FessAdminAction {
         // nothing
     }
 
+    private void upgradeFrom14_15() {
+        // nothing
+    }
+
     private String[] getDictionaryPaths() {
         try (CurlResponse response = ComponentUtil.getCurlHelper().get("/_configsync/file").param("size", "1000").execute()) {
             if (response.getHttpStatusCode() == 200) {
diff --git a/src/main/java/org/codelibs/fess/helper/SystemHelper.java b/src/main/java/org/codelibs/fess/helper/SystemHelper.java
index 97abddfeb..90e33a13f 100644
--- a/src/main/java/org/codelibs/fess/helper/SystemHelper.java
+++ b/src/main/java/org/codelibs/fess/helper/SystemHelper.java
@@ -135,7 +135,7 @@ public class SystemHelper {
             logger.debug("Initialize {}", this.getClass().getSimpleName());
         }
         final Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
-        cal.set(2026, 1 - 1, 1); // EOL Date
+        cal.set(2026, 2 - 1, 1); // EOL Date
         eolTime = cal.getTimeInMillis();
         if (isEoled()) {
             logger.error("Your system is out of support. See https://fess.codelibs.org/eol.html");
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 b51001a09..eb67efaf0 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
@@ -83,6 +83,7 @@
 											<la:option value="14.12">14.12</la:option>
 											<la:option value="14.13">14.13</la:option>
 											<la:option value="14.14">14.14</la:option>
+											<la:option value="14.15">14.15</la:option>
 										</la:select>
 									</div>
 								</div>